diff --git a/codegen/__init__.py b/codegen/__init__.py
index 3c9986d6..c4bde3ef 100644
--- a/codegen/__init__.py
+++ b/codegen/__init__.py
@@ -2,4 +2,4 @@
 
 # Note: the kafka-clients dependency of the Java tester also needs updating when
 # this is bumped (in java_tester/build.gradle).
-build_tag: Final = "3.9.0-rc5"
+build_tag: Final = "3.9.0"
diff --git a/compose.yml b/compose.yml
index d849ea23..039fb510 100644
--- a/compose.yml
+++ b/compose.yml
@@ -1,7 +1,7 @@
 name: kio
 services:
   kafka:
-    image: apache/kafka:3.9.0-rc5
+    image: apache/kafka:3.9.0
     hostname: broker
     container_name: broker
     ports:
diff --git a/java_tester/build.gradle b/java_tester/build.gradle
index cefb728a..d37cec5e 100644
--- a/java_tester/build.gradle
+++ b/java_tester/build.gradle
@@ -11,9 +11,9 @@ java {
 repositories {
     mavenCentral()
     // This allows installing release candidates.
-    maven {
-        url = uri("https://repository.apache.org/content/groups/staging/")
-    }
+    // maven {
+    //     url = uri("https://repository.apache.org/content/groups/staging/")
+    // }
 }
 
 dependencies {