diff --git a/examples/README.md b/examples/README.md
index 172319b..0105590 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -6,7 +6,7 @@
   - the eth private key will only be used in the Py SDK to sign a message
   - the eth private key is not required in order to trade on the platform
   - the eth private key is not passed to the binary 
-  - the API key config is saved in a local file `./api_key_config.json`
+  - the API key config is saved as `examples/api_key_config.json`; examples resolve this path from their source location, so they can be run from any working directory
 
 ## Start trading on testnet
 - `create_modify_cancel_order_http.py`
diff --git a/examples/integrator/approve.py b/examples/integrator/approve.py
index 270c8e8..cae610c 100644
--- a/examples/integrator/approve.py
+++ b/examples/integrator/approve.py
@@ -4,12 +4,11 @@
 
 
 ETH_PRIVATE_KEY = ""
-CONFIG_FILE = "../api_key_config.json"
 APPROVAL_EXPIRY = int(time.time() * 1000) + 90 * 24 * 60 * 60 * 1000  # now + 90 days, in ms
 
 
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
 
     err = client.check_client()
     if err is not None:
@@ -31,4 +30,4 @@ async def main():
     await api_client.close()
 
 if __name__ == "__main__":
-    asyncio.run(main())
\ No newline at end of file
+    asyncio.run(main())
diff --git a/examples/integrator/approve_same_master_account.py b/examples/integrator/approve_same_master_account.py
index 7307a5f..a7e8d98 100644
--- a/examples/integrator/approve_same_master_account.py
+++ b/examples/integrator/approve_same_master_account.py
@@ -3,12 +3,11 @@
 from examples.utils import default_example_setup
 
 
-CONFIG_FILE = "../api_key_config.json"
 APPROVAL_EXPIRY = int(time.time() * 1000) + 90 * 24 * 60 * 60 * 1000  # now + 90 days, in ms
 
 
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
 
     err = client.check_client()
     if err is not None:
@@ -30,4 +29,4 @@ async def main():
     await api_client.close()
 
 if __name__ == "__main__":
-    asyncio.run(main())
\ No newline at end of file
+    asyncio.run(main())
diff --git a/examples/integrator/approve_zero_fees.py b/examples/integrator/approve_zero_fees.py
index 8aeddca..c62a79d 100644
--- a/examples/integrator/approve_zero_fees.py
+++ b/examples/integrator/approve_zero_fees.py
@@ -4,12 +4,11 @@
 from examples.utils import default_example_setup
 
 
-CONFIG_FILE = "../api_key_config.json"
 APPROVAL_EXPIRY = int(time.time() * 1000) + 90 * 24 * 60 * 60 * 1000  # now + 90 days, in ms
 
 
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
 
     err = client.check_client()
     if err is not None:
@@ -32,4 +31,4 @@ async def main():
 
 
 if __name__ == "__main__":
-    asyncio.run(main())
\ No newline at end of file
+    asyncio.run(main())
diff --git a/examples/integrator/create_market_order.py b/examples/integrator/create_market_order.py
index b6ec720..209239a 100644
--- a/examples/integrator/create_market_order.py
+++ b/examples/integrator/create_market_order.py
@@ -2,11 +2,8 @@
 from examples.utils import default_example_setup
 
 
-CONFIG_FILE = "../api_key_config.json"
-
-
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
     client.check_client()
 
     # Note: change this to 2048 to trade spot ETH. Make sure you have at least 0.1 ETH to trade spot.
diff --git a/examples/integrator/create_modify_order.py b/examples/integrator/create_modify_order.py
index 042e9dd..529aed7 100644
--- a/examples/integrator/create_modify_order.py
+++ b/examples/integrator/create_modify_order.py
@@ -2,11 +2,8 @@
 from examples.utils import default_example_setup
 
 
-CONFIG_FILE = "../api_key_config.json"
-
-
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
     client.check_client()
 
     # Note: change this to 2048 to trade spot ETH. Make sure you have at least 0.1 ETH to trade spot.
diff --git a/examples/integrator/revoke.py b/examples/integrator/revoke.py
index 903cc59..e3b19b9 100644
--- a/examples/integrator/revoke.py
+++ b/examples/integrator/revoke.py
@@ -2,11 +2,8 @@
 from examples.utils import default_example_setup
 
 
-CONFIG_FILE = "../api_key_config.json"
-
-
 async def main():
-    client, api_client, _ = default_example_setup(CONFIG_FILE)
+    client, api_client, _ = default_example_setup()
 
     err = client.check_client()
     if err is not None:
@@ -28,4 +25,4 @@ async def main():
     await api_client.close()
 
 if __name__ == "__main__":
-    asyncio.run(main())
\ No newline at end of file
+    asyncio.run(main())
diff --git a/examples/orders/create_market_order_async_client.py b/examples/orders/create_market_order_async_client.py
index 28b4ca4..409e3c6 100644
--- a/examples/orders/create_market_order_async_client.py
+++ b/examples/orders/create_market_order_async_client.py
@@ -1,17 +1,18 @@
 import asyncio
 
 import lighter
-from examples.utils import get_api_key_config, trim_exception
+from examples.utils import DEFAULT_API_KEY_CONFIG, get_api_key_config, trim_exception
 
 
-async def create_signer_for_user(config_file="./api_key_config.json"):
+async def create_signer_for_user(config_file=DEFAULT_API_KEY_CONFIG):
     # Constructing the SignerClient performs no network I/O (nonces are
     # fetched lazily on first use), so it is safe inside a coroutine.
-    base_url, account_index, private_keys = get_api_key_config(config_file)
+    profile, account_index, private_keys = get_api_key_config(config_file)
     client = lighter.SignerClient(
-        url=base_url,
+        url=profile.api_url,
         account_index=account_index,
         api_private_keys=private_keys,
+        chain_id=profile.chain_id,
     )
 
     err = client.check_client()
@@ -22,7 +23,7 @@ async def create_signer_for_user(config_file="./api_key_config.json"):
     return client
 
 
-async def place_market_order_for_user(config_file="./api_key_config.json"):
+async def place_market_order_for_user(config_file=DEFAULT_API_KEY_CONFIG):
     client = await create_signer_for_user(config_file)
 
     try:
@@ -32,7 +33,7 @@ async def place_market_order_for_user(config_file="./api_key_config.json"):
         tx, tx_hash, err = await client.create_market_order(
             market_index=market_index,
             client_order_index=0,
-            base_amount=100,  # 0.1 ETH
+            base_amount=10,  # 0.1 ETH
             avg_execution_price=4000_00,  # $4000 -- worst acceptable price for the order
             is_ask=False,
         )
diff --git a/examples/orders/modify_order_version_http.py b/examples/orders/modify_order_version_http.py
new file mode 100644
index 0000000..8e20e75
--- /dev/null
+++ b/examples/orders/modify_order_version_http.py
@@ -0,0 +1,108 @@
+import asyncio
+import time
+from examples.utils import default_example_setup
+
+
+# Versioned order modification.
+#
+# order_version: a client-supplied, strictly increasing version guard for modify order.
+#   * A modify with order_version=V is applied only if V is greater than the order's
+#     current version. On success, the order's version becomes V.
+#   * The default (NIL_ORDER_VERSION = 0) skips the check and always applies.
+#   * A stale modify (version <= current) is rejected, which protects against
+#     out-of-order or retried modifies overwriting a newer one.
+#
+# A common pattern is to use a millisecond timestamp as the version.
+async def main():
+    client, api_client, _ = default_example_setup()
+    client.check_client()
+
+    # Note: change this to 2048 to trade spot ETH. Make sure you have at least 0.1 ETH to trade spot.
+    market_index = 0
+    client_order_index = int(time.time() * 1000)
+
+    # create order
+    api_key_index, nonce = client.nonce_manager.next_nonce()
+    tx, tx_hash, err = await client.create_order(
+        market_index=market_index,
+        client_order_index=client_order_index,
+        base_amount=1000,  # 0.1 ETH
+        price=4050_00,  # $4050
+        is_ask=True,
+        order_type=client.ORDER_TYPE_LIMIT,
+        time_in_force=client.ORDER_TIME_IN_FORCE_GOOD_TILL_TIME,
+        reduce_only=False,
+        trigger_price=0,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    print(f"Create Order {tx=} {tx_hash=} {err=}")
+    if err is not None:
+        raise Exception(err)
+
+    ## modify order with version 100
+    # use the same API key so the TX goes after the create order TX
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx, tx_hash, err = await client.modify_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        base_amount=1100,  # 0.11 ETH
+        price=4100_00,  # $4100
+        trigger_price=0,
+        order_version=100,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    print(f"Modify Order (version=100) {tx=} {tx_hash=} {err=}")
+    if err is not None:
+        raise Exception(err)
+
+    ## stale modify: version 100 is not greater than the order's current version (100),
+    ## so this modify is rejected by the exchange and the order keeps its previous state
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx, tx_hash, err = await client.modify_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        base_amount=1200,  # 0.12 ETH
+        price=4150_00,  # $4150
+        trigger_price=0,
+        order_version=100,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    print(f"Stale Modify Order (version=100, expected to be rejected) {tx=} {tx_hash=} {err=}")
+
+    ## modify order with a higher version (200) succeeds
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx, tx_hash, err = await client.modify_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        base_amount=1200,  # 0.12 ETH
+        price=4150_00,  # $4150
+        trigger_price=0,
+        order_version=200,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    print(f"Modify Order (version=200) {tx=} {tx_hash=} {err=}")
+    if err is not None:
+        raise Exception(err)
+
+    ## cancel order
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx, tx_hash, err = await client.cancel_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    print(f"Cancel Order {tx=} {tx_hash=} {err=}")
+    if err is not None:
+        raise Exception(err)
+
+    await client.close()
+    await api_client.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/examples/orders/modify_order_version_ws.py b/examples/orders/modify_order_version_ws.py
new file mode 100644
index 0000000..a75d290
--- /dev/null
+++ b/examples/orders/modify_order_version_ws.py
@@ -0,0 +1,76 @@
+import time
+import websockets
+import asyncio
+from examples.utils import default_example_setup, ws_send_tx
+
+
+# this example does the same thing as the modify_order_version_http.py example, but sends the TX over WS instead of HTTP
+async def main():
+    client, api_client, ws_client_promise = default_example_setup()
+    client.check_client()
+
+    # set up WS client and print a connected message
+    ws_client: websockets.ClientConnection = await ws_client_promise
+    print("Received:", await ws_client.recv())
+
+    # Note: change this to 2048 to trade spot ETH. Make sure you have at least 0.1 ETH to trade spot.
+    market_index = 0
+    client_order_index = int(time.time() * 1000)
+
+    # create order
+    api_key_index, nonce = client.nonce_manager.next_nonce()
+    tx_type, tx_info, tx_hash, err = client.sign_create_order(
+        market_index=market_index,
+        client_order_index=client_order_index,
+        base_amount=1000,  # 0.1 ETH
+        price=4050_00,  # $4050
+        is_ask=True,
+        order_type=client.ORDER_TYPE_LIMIT,
+        time_in_force=client.ORDER_TIME_IN_FORCE_GOOD_TILL_TIME,
+        reduce_only=False,
+        trigger_price=0,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    if err is not None:
+        raise Exception(err)
+    await ws_send_tx(ws_client, tx_type, tx_info, tx_hash)
+
+    ## modify order using a millisecond timestamp as the order version
+    # a modify is applied only if its order_version is greater than the order's current version
+    # use the same API key so the TX goes after the create order TX
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx_type, tx_info, tx_hash, err = client.sign_modify_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        base_amount=1100,  # 0.11 ETH
+        price=4100_00,  # $4100
+        trigger_price=0,
+        order_version=int(time.time() * 1000),
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    if err is not None:
+        raise Exception(err)
+    await ws_send_tx(ws_client, tx_type, tx_info, tx_hash)
+
+    ## cancel order
+    # use the same API key so the TX goes after the modify order TX
+    api_key_index, nonce = client.nonce_manager.next_nonce(api_key_index)
+    tx_type, tx_info, tx_hash, err = client.sign_cancel_order(
+        market_index=market_index,
+        order_index=client_order_index,
+        nonce=nonce,
+        api_key_index=api_key_index,
+    )
+    if err is not None:
+        raise Exception(err)
+    await ws_send_tx(ws_client, tx_type, tx_info, tx_hash)
+
+    await client.close()
+    await api_client.close()
+    await ws_client.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/examples/utils.py b/examples/utils.py
index 168a2e4..30ddd56 100644
--- a/examples/utils.py
+++ b/examples/utils.py
@@ -1,15 +1,19 @@
 from typing import Tuple, Optional
 import logging
 import json
+from pathlib import Path
 import websockets
 import lighter
 
 
+DEFAULT_API_KEY_CONFIG = Path(__file__).resolve().with_name("api_key_config.json")
+
+
 def trim_exception(e: Exception) -> str:
     return str(e).strip().split("\n")[-1]
 
 
-def save_api_key_config(endpoint_profile, account_index, private_keys, config_file="./api_key_config.json"):
+def save_api_key_config(endpoint_profile, account_index, private_keys, config_file=DEFAULT_API_KEY_CONFIG):
     with open(config_file, "w", encoding="utf-8") as f:
         json.dump({
             "endpointProfile": endpoint_profile.name,
@@ -18,7 +22,7 @@ def save_api_key_config(endpoint_profile, account_index, private_keys, config_fi
         }, f, ensure_ascii=False, indent=2)
 
 
-def get_api_key_config(config_file="./api_key_config.json"):
+def get_api_key_config(config_file=DEFAULT_API_KEY_CONFIG):
     with open(config_file) as f:
         cfg = json.load(f)
 
@@ -43,7 +47,7 @@ def get_api_key_config(config_file="./api_key_config.json"):
     return profile, cfg["accountIndex"], private_key
 
 
-def default_example_setup(config_file="./api_key_config.json",nonce_management_type=lighter.nonce_manager.NonceManagerType.OPTIMISTIC,endpoint_profile=None,) -> Optional[Tuple[lighter.SignerClient, lighter.ApiClient, websockets.connect]]:
+def default_example_setup(config_file=DEFAULT_API_KEY_CONFIG,nonce_management_type=lighter.nonce_manager.NonceManagerType.OPTIMISTIC,endpoint_profile=None,) -> Optional[Tuple[lighter.SignerClient, lighter.ApiClient, websockets.connect]]:
     logging.basicConfig(level=logging.DEBUG)
 
     config_endpoint, account_index, private_keys = get_api_key_config(config_file)
diff --git a/lighter/signer_client.py b/lighter/signer_client.py
index 53a172a..c8e83ab 100644
--- a/lighter/signer_client.py
+++ b/lighter/signer_client.py
@@ -135,7 +135,7 @@ def __populate_shared_library_functions(signer):
     signer.SignCancelAllOrders.argtypes = [ctypes.c_int, ctypes.c_longlong, ctypes.c_int, ctypes.c_uint8, ctypes.c_longlong, ctypes.c_int, ctypes.c_longlong]
     signer.SignCancelAllOrders.restype = SignedTxResponse
 
-    signer.SignModifyOrder.argtypes = [ctypes.c_int, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_int, ctypes.c_int, ctypes.c_uint8, ctypes.c_uint8, ctypes.c_uint8, ctypes.c_longlong, ctypes.c_int, ctypes.c_longlong]
+    signer.SignModifyOrder.argtypes = [ctypes.c_int, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_int, ctypes.c_int, ctypes.c_uint8, ctypes.c_uint8, ctypes.c_uint8, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_int, ctypes.c_longlong]
     signer.SignModifyOrder.restype = SignedTxResponse
 
     signer.SignTransfer.argtypes = [ctypes.c_longlong, ctypes.c_int16, ctypes.c_int8, ctypes.c_int8, ctypes.c_longlong, ctypes.c_longlong, ctypes.c_char_p, ctypes.c_uint8, ctypes.c_longlong, ctypes.c_int, ctypes.c_longlong]
@@ -313,6 +313,8 @@ class SignerClient:
 
     NIL_MARKET_INDEX = 255
 
+    NIL_ORDER_VERSION = 0
+
     ROUTE_PERP = 0
     ROUTE_SPOT = 1
 
@@ -564,11 +566,12 @@ def sign_modify_order(
             integrator_maker_fee: int = 0,
             self_trade_behavior_mode: int = 0,
             self_trade_equality_mode: int = 0,
+            order_version: int = NIL_ORDER_VERSION,
             skip_nonce: int = SKIP_NONCE_OFF,
             nonce: int = DEFAULT_NONCE,
             api_key_index: int = DEFAULT_API_KEY_INDEX
     ) -> Union[Tuple[str, str, str, None], Tuple[None, None, None, str]]:
-        return self.__decode_tx_info(self.signer.SignModifyOrder(market_index, order_index, base_amount, price, trigger_price, integrator_account_index, integrator_taker_fee, integrator_maker_fee, self_trade_behavior_mode, self_trade_equality_mode, skip_nonce, nonce, api_key_index, self.account_index))
+        return self.__decode_tx_info(self.signer.SignModifyOrder(market_index, order_index, base_amount, price, trigger_price, integrator_account_index, integrator_taker_fee, integrator_maker_fee, self_trade_behavior_mode, self_trade_equality_mode, skip_nonce, nonce, order_version, api_key_index, self.account_index))
 
     def sign_approve_integrator(
             self,
@@ -1176,6 +1179,7 @@ async def modify_order(
             integrator_maker_fee: int = 0,
             self_trade_behavior_mode: int = 0,
             self_trade_equality_mode: int = 0,
+            order_version: int = NIL_ORDER_VERSION,
             skip_nonce: int = SKIP_NONCE_OFF,
             nonce: int = DEFAULT_NONCE,
             api_key_index: int = DEFAULT_API_KEY_INDEX
@@ -1191,6 +1195,7 @@ async def modify_order(
             integrator_maker_fee=integrator_maker_fee,
             self_trade_behavior_mode=self_trade_behavior_mode,
             self_trade_equality_mode=self_trade_equality_mode,
+            order_version=order_version,
             skip_nonce=skip_nonce,
             nonce=nonce,
             api_key_index=api_key_index
diff --git a/lighter/signers/lighter-signer-darwin-amd64.dylib b/lighter/signers/lighter-signer-darwin-amd64.dylib
index f3b47a4..848512a 100644
Binary files a/lighter/signers/lighter-signer-darwin-amd64.dylib and b/lighter/signers/lighter-signer-darwin-amd64.dylib differ
diff --git a/lighter/signers/lighter-signer-darwin-amd64.h b/lighter/signers/lighter-signer-darwin-amd64.h
index cd8e9ee..83ead9e 100644
--- a/lighter/signers/lighter-signer-darwin-amd64.h
+++ b/lighter/signers/lighter-signer-darwin-amd64.h
@@ -121,7 +121,7 @@ extern SignedTxResponse SignCancelOrder(int cMarketIndex, long long cOrderIndex,
 extern SignedTxResponse SignWithdraw(int cAssetIndex, int cRouteType, unsigned long long cAmount, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCreateSubAccount(uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCancelAllOrders(int cTimeInForce, long long cTime, int cCancelAllMarketIndex, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
-extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long cIndex, long long cBaseAmount, long long cPrice, long long cTriggerPrice, long long cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
+extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long cIndex, long long cBaseAmount, long long cPrice, long long cTriggerPrice, long long cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long cNonce, long long cOrderVersion, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignTransfer(long long cToAccountIndex, int16_t cAssetIndex, uint8_t cFromRouteType, uint8_t cToRouteType, long long cAmount, long long cUsdcFee, char* cMemo, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCreatePublicPool(long long cOperatorFee, int cInitialTotalShares, long long cMinOperatorShareRate, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignUpdatePublicPool(long long cPublicPoolIndex, int cStatus, long long cOperatorFee, int cMinOperatorShareRate, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
diff --git a/lighter/signers/lighter-signer-darwin-arm64.dylib b/lighter/signers/lighter-signer-darwin-arm64.dylib
index 315f66d..9f93c93 100644
Binary files a/lighter/signers/lighter-signer-darwin-arm64.dylib and b/lighter/signers/lighter-signer-darwin-arm64.dylib differ
diff --git a/lighter/signers/lighter-signer-darwin-arm64.h b/lighter/signers/lighter-signer-darwin-arm64.h
index fcd087a..6e1048c 100644
--- a/lighter/signers/lighter-signer-darwin-arm64.h
+++ b/lighter/signers/lighter-signer-darwin-arm64.h
@@ -129,7 +129,7 @@ extern SignedTxResponse SignCancelOrder(int cMarketIndex, long long cOrderIndex,
 extern SignedTxResponse SignWithdraw(int cAssetIndex, int cRouteType, unsigned long long cAmount, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCreateSubAccount(uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCancelAllOrders(int cTimeInForce, long long cTime, int cCancelAllMarketIndex, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
-extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long cIndex, long long cBaseAmount, long long cPrice, long long cTriggerPrice, long long cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
+extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long cIndex, long long cBaseAmount, long long cPrice, long long cTriggerPrice, long long cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long cNonce, long long cOrderVersion, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignTransfer(long long cToAccountIndex, int16_t cAssetIndex, uint8_t cFromRouteType, uint8_t cToRouteType, long long cAmount, long long cUsdcFee, char* cMemo, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignCreatePublicPool(long long cOperatorFee, int cInitialTotalShares, long long cMinOperatorShareRate, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
 extern SignedTxResponse SignUpdatePublicPool(long long cPublicPoolIndex, int cStatus, long long cOperatorFee, int cMinOperatorShareRate, uint8_t cSkipNonce, long long cNonce, int cApiKeyIndex, long long cAccountIndex);
diff --git a/lighter/signers/lighter-signer-linux-amd64.h b/lighter/signers/lighter-signer-linux-amd64.h
index 3803989..df3db99 100644
--- a/lighter/signers/lighter-signer-linux-amd64.h
+++ b/lighter/signers/lighter-signer-linux-amd64.h
@@ -121,7 +121,7 @@ extern SignedTxResponse SignCancelOrder(int cMarketIndex, long long int cOrderIn
 extern SignedTxResponse SignWithdraw(int cAssetIndex, int cRouteType, long long unsigned int cAmount, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCreateSubAccount(uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCancelAllOrders(int cTimeInForce, long long int cTime, int cCancelAllMarketIndex, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
-extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
+extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, long long int cOrderVersion, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignTransfer(long long int cToAccountIndex, int16_t cAssetIndex, uint8_t cFromRouteType, uint8_t cToRouteType, long long int cAmount, long long int cUsdcFee, char* cMemo, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCreatePublicPool(long long int cOperatorFee, int cInitialTotalShares, long long int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignUpdatePublicPool(long long int cPublicPoolIndex, int cStatus, long long int cOperatorFee, int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
diff --git a/lighter/signers/lighter-signer-linux-amd64.so b/lighter/signers/lighter-signer-linux-amd64.so
index 384ab64..c0998b0 100644
Binary files a/lighter/signers/lighter-signer-linux-amd64.so and b/lighter/signers/lighter-signer-linux-amd64.so differ
diff --git a/lighter/signers/lighter-signer-linux-arm64.h b/lighter/signers/lighter-signer-linux-arm64.h
index 3803989..df3db99 100644
--- a/lighter/signers/lighter-signer-linux-arm64.h
+++ b/lighter/signers/lighter-signer-linux-arm64.h
@@ -121,7 +121,7 @@ extern SignedTxResponse SignCancelOrder(int cMarketIndex, long long int cOrderIn
 extern SignedTxResponse SignWithdraw(int cAssetIndex, int cRouteType, long long unsigned int cAmount, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCreateSubAccount(uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCancelAllOrders(int cTimeInForce, long long int cTime, int cCancelAllMarketIndex, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
-extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
+extern SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, long long int cOrderVersion, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignTransfer(long long int cToAccountIndex, int16_t cAssetIndex, uint8_t cFromRouteType, uint8_t cToRouteType, long long int cAmount, long long int cUsdcFee, char* cMemo, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignCreatePublicPool(long long int cOperatorFee, int cInitialTotalShares, long long int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern SignedTxResponse SignUpdatePublicPool(long long int cPublicPoolIndex, int cStatus, long long int cOperatorFee, int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
diff --git a/lighter/signers/lighter-signer-linux-arm64.so b/lighter/signers/lighter-signer-linux-arm64.so
index 515f36d..a6f4905 100644
Binary files a/lighter/signers/lighter-signer-linux-arm64.so and b/lighter/signers/lighter-signer-linux-arm64.so differ
diff --git a/lighter/signers/lighter-signer-windows-amd64.dll b/lighter/signers/lighter-signer-windows-amd64.dll
index 3f16e04..dfaac8a 100644
Binary files a/lighter/signers/lighter-signer-windows-amd64.dll and b/lighter/signers/lighter-signer-windows-amd64.dll differ
diff --git a/lighter/signers/lighter-signer-windows-amd64.h b/lighter/signers/lighter-signer-windows-amd64.h
index 95d8450..92c77f5 100644
--- a/lighter/signers/lighter-signer-windows-amd64.h
+++ b/lighter/signers/lighter-signer-windows-amd64.h
@@ -121,7 +121,7 @@ extern __declspec(dllexport) SignedTxResponse SignCancelOrder(int cMarketIndex,
 extern __declspec(dllexport) SignedTxResponse SignWithdraw(int cAssetIndex, int cRouteType, long long unsigned int cAmount, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern __declspec(dllexport) SignedTxResponse SignCreateSubAccount(uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern __declspec(dllexport) SignedTxResponse SignCancelAllOrders(int cTimeInForce, long long int cTime, int cCancelAllMarketIndex, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
-extern __declspec(dllexport) SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
+extern __declspec(dllexport) SignedTxResponse SignModifyOrder(int cMarketIndex, long long int cIndex, long long int cBaseAmount, long long int cPrice, long long int cTriggerPrice, long long int cIntegratorAccountIndex, int cIntegratorTakerFee, int cIntegratorMakerFee, uint8_t cSelfTradeBehaviorMode, uint8_t cSelfTradeEqualityMode, uint8_t cSkipNonce, long long int cNonce, long long int cOrderVersion, int cApiKeyIndex, long long int cAccountIndex);
 extern __declspec(dllexport) SignedTxResponse SignTransfer(long long int cToAccountIndex, int16_t cAssetIndex, uint8_t cFromRouteType, uint8_t cToRouteType, long long int cAmount, long long int cUsdcFee, char* cMemo, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern __declspec(dllexport) SignedTxResponse SignCreatePublicPool(long long int cOperatorFee, int cInitialTotalShares, long long int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);
 extern __declspec(dllexport) SignedTxResponse SignUpdatePublicPool(long long int cPublicPoolIndex, int cStatus, long long int cOperatorFee, int cMinOperatorShareRate, uint8_t cSkipNonce, long long int cNonce, int cApiKeyIndex, long long int cAccountIndex);