diff --git a/build.gradle b/build.gradle
index a2641657..62c2d13e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ apply plugin: 'com.palantir.jdks.latest'
 
 javaVersions {
     libraryTarget = 11
-    runtime = 17
+    runtime = 21
 }
 
 version gitVersion()