diff --git a/build.gradle.kts b/build.gradle.kts
index eb6d2320..3f728938 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -37,7 +37,7 @@ graalvmNative {
             if (System.getenv("GRAALVM_HOME") == null) {
                 toolchainDetection.set(true)
                 javaLauncher.set(javaToolchains.launcherFor {
-                    languageVersion.set(JavaLanguageVersion.of(22))
+                    languageVersion.set(JavaLanguageVersion.of(21))
                 })
             } else {
                 toolchainDetection.set(false)
diff --git a/lib/build.gradle.kts b/lib/build.gradle.kts
index 08091201..c8f22f7c 100644
--- a/lib/build.gradle.kts
+++ b/lib/build.gradle.kts
@@ -8,7 +8,7 @@ java {
     targetCompatibility = JavaVersion.VERSION_21
 
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(22))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }