diff --git a/codex-nms/codex-nms-v26_2/pom.xml b/codex-nms/codex-nms-v26_2/pom.xml
index 307bf0e..f25ad68 100644
--- a/codex-nms/codex-nms-v26_2/pom.xml
+++ b/codex-nms/codex-nms-v26_2/pom.xml
@@ -16,6 +16,7 @@
 
     <properties>
         <java.version>21</java.version>
+        <nms.jdk>25</nms.jdk>
     </properties>
 
     <dependencies>
diff --git a/codex-nms/codex-nms-v26_3/pom.xml b/codex-nms/codex-nms-v26_3/pom.xml
index 4c384d0..80ed082 100644
--- a/codex-nms/codex-nms-v26_3/pom.xml
+++ b/codex-nms/codex-nms-v26_3/pom.xml
@@ -16,6 +16,7 @@
 
     <properties>
         <java.version>21</java.version>
+        <nms.jdk>25</nms.jdk>
     </properties>
 
     <dependencies>
diff --git a/codex-nms/pom.xml b/codex-nms/pom.xml
index 70c6e6a..3ef46d6 100644
--- a/codex-nms/pom.xml
+++ b/codex-nms/pom.xml
@@ -27,6 +27,15 @@
     <name>CodexNMS</name>
     <description>A collection of NMS libraries for Codex</description>
 
+    <properties>
+        <!-- JDK each NMS module compiles with, through a Maven toolchain (see the jdkToolchain below).
+             Since JDK 22, javac also reads type annotations from the Spigot jars and then fails on
+             classes they reference that aren't on the classpath (e.g. datafixerupper), so the older
+             versions compile on 21. The 26.x modules override this with 25, because those Spigot
+             jars are Java 25 class files. -->
+        <nms.jdk>21</nms.jdk>
+    </properties>
+
     <modules>
         <module>codex-nms-v1_16_5</module>
         <module>codex-nms-v1_17_1</module>
@@ -56,6 +65,20 @@
         </dependency>
     </dependencies>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <jdkToolchain>
+                        <version>${nms.jdk}</version>
+                    </jdkToolchain>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
     <licenses>
         <license>
             <name>MIT License</name>