diff --git a/pom.xml b/pom.xml
index f7285cf..508ad6a 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>2.11.6</io7m.org.immutables.version>
+    <io7m.org.immutables.version>2.12.0</io7m.org.immutables.version>
   </properties>
 
   <licenses>