diff --git a/build.gradle b/build.gradle
index 80a8bf4..a0103e8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,20 +10,20 @@
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
+        languageVersion = JavaLanguageVersion.of(17)
     }
 }
 
 compileJava {
     options.compilerArgs << '-Xlint:unchecked'
     options.compilerArgs << '-Xlint:rawtypes'
-    options.release = 21
+    options.release = 17
 }
 
 compileTestJava {
     options.compilerArgs << '-Xlint:unchecked'
     options.compilerArgs << '-Xlint:rawtypes'
-    options.release = 21
+    options.release = 17
 }
 
 dependencies {