diff --git a/build.gradle b/build.gradle
index 835d02e94c..cc0caad804 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,7 +17,7 @@
 
 buildscript {
   ext {
-    kotlinVersion = "1.7.21"
+    kotlinVersion = "1.9.21"
     junitPlatformVersion = "1.0.2"
   }
 
diff --git a/gradle.properties b/gradle.properties
index 9b779d5dbf..c62f366bb5 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,7 +3,7 @@ korkVersion=1-0-SNAPSHOT
 org.gradle.parallel=true
 spinnakerGradleVersion=1-0-SNAPSHOT
 #targetJava11=true
-kotlinVersion=1.7.21
+kotlinVersion=1.9.21
 
 # To enable a composite reference to a project, set the
 #  project property `'<projectName>Composite=true'`.