diff --git a/gradle.properties b/gradle.properties
index 10ffe3d93..a0b574ab2 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,7 +3,7 @@ korkVersion=7.222.0
 org.gradle.parallel=true
 spinnakerGradleVersion=8.32.1
 targetJava11=true
-kotlinVersion=1.5.32
+kotlinVersion=1.6.21
 # To enable a composite reference to a project, set the
 #  project property `'<projectName>Composite=true'`.
 #
diff --git a/gradle/kotlin.gradle b/gradle/kotlin.gradle
index 95953869a..83e81ffc6 100644
--- a/gradle/kotlin.gradle
+++ b/gradle/kotlin.gradle
@@ -19,14 +19,14 @@ apply plugin: "kotlin-spring"
 
 compileKotlin {
     kotlinOptions {
-        languageVersion = "1.5"
+        languageVersion = "1.6"
         jvmTarget = "11"
     }
 }
 
 compileTestKotlin {
     kotlinOptions {
-        languageVersion = "1.5"
+        languageVersion = "1.6"
         jvmTarget = "11"
     }
 }