diff --git a/lower-constraints.txt b/lower-constraints.txt
index 15f415f..a550ecf 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -3,7 +3,7 @@ Babel==2.3.4
 coverage==4.0
 doc8==0.6.0
 fixtures==3.0.0
-hacking==1.1.0
+hacking==3.1.0
 keystoneauth1===3.18.0
 mistral-lib==2.3.0
 oslo.log==3.36.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 396d38e..4743b22 100644
--- a/test-requirements.txt
+++ b/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>=3.0.1,<3.1.0 # Apache-2.0
+hacking>=3.0.1 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0