diff --git a/tsconfig/tsconfig/test-requirements.txt b/tsconfig/tsconfig/test-requirements.txt
index 56e48064f8..b7515b14ac 100644
--- a/tsconfig/tsconfig/test-requirements.txt
+++ b/tsconfig/tsconfig/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=1.1.0 # Apache-2.0
+hacking>=1.1.0,<4.0.1 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD