diff --git a/package.json b/package.json
index f261676..a93ede4 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
     "bench:compact": "node --expose-gc --loader ts-node/esm --experimental-specifier-resolution=node examples/bench-compact-history.ts"
   },
   "dependencies": {
-    "@cocalc/diff-match-patch": "^1.1.0",
+    "@cocalc/diff-match-patch": "^1.1.1",
     "events": "^3.3.0",
     "fast-deep-equal": "^3.1.3",
     "fast-json-stable-stringify": "^2.1.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b7e3e8b..b09e5d9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -24,8 +24,8 @@ importers:
   .:
     dependencies:
       '@cocalc/diff-match-patch':
-        specifier: ^1.1.0
-        version: 1.1.0
+        specifier: ^1.1.1
+        version: 1.1.1
       events:
         specifier: ^3.3.0
         version: 3.3.0
@@ -148,8 +148,8 @@ packages:
     resolution: {integrity: sha512-Vj1jF3cPfxg7OAfoI7QnVKLoILlm2JF9pnVHrX8qx7AHMiYWT+NDAA7jChlNgRS4WTLc/fD1lXLmPixluj+3Gg==}
     engines: {node: '>=6.9.0'}
 
-  '@cocalc/diff-match-patch@1.1.0':
-    resolution: {integrity: sha512-eRk0KlDGL6/NzJskY6xbRqGnHSuG7alAUQp+Qtd4vs65bLeIn4IMLJb/RT7PZozNL0KR5u3PxRIdDm7tzAGN4g==}
+  '@cocalc/diff-match-patch@1.1.1':
+    resolution: {integrity: sha512-za8xDP+3G0Cmm0auvXXbuQF0AP0xsydyc7a+rDDfeXg7zm250Krsst79dVeDf6eD9t/5eRHkxiz1kDUosIItJg==}
 
   '@cspotcode/source-map-support@0.8.1':
     resolution: {integrity: sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==}
@@ -1244,7 +1244,7 @@ snapshots:
       '@babel/helper-string-parser': 7.29.7
       '@babel/helper-validator-identifier': 7.29.7
 
-  '@cocalc/diff-match-patch@1.1.0': {}
+  '@cocalc/diff-match-patch@1.1.1': {}
 
   '@cspotcode/source-map-support@0.8.1':
     dependencies:
@@ -1592,6 +1592,10 @@ snapshots:
     optionalDependencies:
       picomatch: 4.0.4
 
+  fdir@6.5.0(picomatch@4.0.7):
+    optionalDependencies:
+      picomatch: 4.0.7
+
   find-cache-dir@3.3.2:
     dependencies:
       commondir: 1.0.1
@@ -1877,8 +1881,8 @@ snapshots:
 
   tinyglobby@0.2.17:
     dependencies:
-      fdir: 6.5.0(picomatch@4.0.4)
-      picomatch: 4.0.4
+      fdir: 6.5.0(picomatch@4.0.7)
+      picomatch: 4.0.7
 
   ts-node@10.9.2(@types/node@22.19.1)(typescript@5.9.3):
     dependencies:
diff --git a/src/dmp-work-limit.test.ts b/src/dmp-work-limit.test.ts
index bb1770e..1dd4cf0 100644
--- a/src/dmp-work-limit.test.ts
+++ b/src/dmp-work-limit.test.ts
@@ -48,3 +48,35 @@ describe("diffs are bounded by work, not the clock", () => {
     }
   });
 });
+
+// Fixed in @cocalc/diff-match-patch 1.1.1.
+describe("a patch keeps every edit", () => {
+  const line = (i: number) => `line ${i}: ` + "abcdefghij".repeat(6) + "\n";
+  function long(bytes: number): string {
+    let s = "";
+    for (let i = 0; s.length < bytes; i++) s += line(i);
+    return s;
+  }
+
+  for (const kb of [800, 2048]) {
+    it(`a one-line edit to ${kb} KB is a patch of the line, not the whole text (0.15)`, () => {
+      const a = long(kb * 1024);
+      const mid = a.indexOf("\n", a.length >> 1) + 1;
+      const b = a.slice(0, mid) + "EDITED " + a.slice(mid);
+      const patch = makePatch(a, b);
+      expect(JSON.stringify(patch).length).toBeLessThan(1000);
+      expect(applyPatch(patch, a)).toEqual([b, true]);
+    });
+  }
+
+  it("an emoji changed only in its high surrogate is not lost (😀 to 🨀)", () => {
+    for (const [a, b] of [
+      ["😀", "🨀"],
+      ["x 😀 y", "x 🨀 y"],
+      ["😀😁", "🨀🨁"],
+      ["p".repeat(400_000) + "😀" + "s".repeat(400_000), "p".repeat(400_000) + "🨀" + "s".repeat(400_000)],
+    ]) {
+      expect(applyPatch(makePatch(a, b), a)).toEqual([b, true]);
+    }
+  });
+});