diff --git a/build.gradle.kts b/build.gradle.kts
index fc760d76..98c3b11b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -77,6 +77,10 @@ allprojects {
         // if it is present.
         // If you remove this line, sources will not be generated.
         withSourcesJar()
+
+        toolchain {
+            languageVersion.set(JavaLanguageVersion.of(chenille.javaVersion))
+        }
     }
 
     tasks.withType<AbstractArchiveTask>().configureEach {