diff --git a/gradle.properties b/gradle.properties
index 8bfb9743e..4c8db96d6 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,6 @@
 fiatVersion=1.44.0
 korkVersion=7.222.0
-kotlinVersion=1.5.32
+kotlinVersion=1.6.21
 org.gradle.parallel=true
 spinnakerGradleVersion=8.32.1
 targetJava11=true
diff --git a/gradle/kotlin.gradle b/gradle/kotlin.gradle
index beeec90f5..18a7d1ee8 100644
--- a/gradle/kotlin.gradle
+++ b/gradle/kotlin.gradle
@@ -18,14 +18,14 @@ apply plugin: "kotlin"
 
 compileKotlin {
   kotlinOptions {
-    languageVersion = "1.5"
+    languageVersion = "1.6"
     jvmTarget = "11"
   }
 }
 
 compileTestKotlin {
   kotlinOptions {
-    languageVersion = "1.5"
+    languageVersion = "1.6"
     jvmTarget = "11"
   }
 }