diff --git a/build.gradle.kts b/build.gradle.kts
index a281d11..8144c7d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -51,14 +51,8 @@ subprojects {
 
             // The following lines are needed at least for the current version of proguard
             dontwarn("java.**")
-            onlyIf {
-                JavaVersion.current().isJava8.also {
-                    if (!it) {
-                        println("The shrinkJar task is disabled because Java 9 or higher does not work with our current proguard configuration.")
-                    }
-                }
-            }
-            libraryjars("${System.getProperty("java.home")}/lib/rt.jar")
+            val homeDir = System.getProperty("java.home") as String
+            libraryjars("$homeDir/lib/rt.jar")
             // Note: dontpreverify() should NOT be used, it will cause errors at runtime
             useuniqueclassmembernames()
             optimizations("method/inlining/*, code/allocation/variable, class/merging/vertical, class/merging/horizontal, code/removal/advanced, code/simplification/branch, code/merging")