diff --git a/cftlib/lib/bootstrapper/build.gradle b/cftlib/lib/bootstrapper/build.gradle
index 2a41d718..3fbe4a38 100644
--- a/cftlib/lib/bootstrapper/build.gradle
+++ b/cftlib/lib/bootstrapper/build.gradle
@@ -1,7 +1,7 @@
 java {
     withJavadocJar()
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
 
diff --git a/cftlib/lib/cftlib-agent/build.gradle b/cftlib/lib/cftlib-agent/build.gradle
index 929c5c8e..61e18999 100644
--- a/cftlib/lib/cftlib-agent/build.gradle
+++ b/cftlib/lib/cftlib-agent/build.gradle
@@ -55,6 +55,6 @@ configurations.each {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }
diff --git a/cftlib/lib/runtime/build.gradle b/cftlib/lib/runtime/build.gradle
index f9bcc46b..de456dcd 100644
--- a/cftlib/lib/runtime/build.gradle
+++ b/cftlib/lib/runtime/build.gradle
@@ -27,6 +27,6 @@ processResources {
 java {
     withJavadocJar()
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(11))
+        languageVersion.set(JavaLanguageVersion.of(17))
     }
 }