Merge "Enforce Java 11 source version with JDK17" into stable-3.6
diff --git a/tools/BUILD b/tools/BUILD
index 26db1fa..6b81871 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -25,7 +25,7 @@
     package_configuration = [
         ":error_prone",
     ],
-    source_version = "17",
+    source_version = "11",
     target_version = "17",
     visibility = ["//visibility:public"],
 )