diff --git a/pom.xml b/pom.xml
index 5f87b19..68010c4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -32,7 +32,7 @@
     <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
 
     <!-- Third-party dependencies. -->
-    <io7m.org.immutables.version>2.10.1</io7m.org.immutables.version>
+    <io7m.org.immutables.version>2.11.1</io7m.org.immutables.version>
   </properties>
 
   <licenses>