diff --git a/build.gradle.kts b/build.gradle.kts
index e8c2c6a..79f784e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -48,7 +48,7 @@ allprojects {
                     toolchain {
                         // Could theoretically be version 8, but it's not compatible with
                         // ErrorProne. Therefore, the JavaCompile release option is used.
-                        languageVersion = JavaLanguageVersion.of(11)
+                        languageVersion = JavaLanguageVersion.of(17)
                     }
                 }