diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4e5f4e8a0..2b43bcf9d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 -r requirements.txt
-mock==3.0.5   # Last version compatible with Python 2.7
+mock<=3.0.5   # Last version compatible with Python 2.7
 nose
 black; python_version >= '3.6'
 regex==2019.11.1; python_version >= '3.6'   # Needed for black
diff --git a/setup.py b/setup.py
index b806f7bae..9bb7cf522 100755
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@ install_requires = [
     "pytz",
     "python-dateutil<3.0.0,>=2.1",
     "python-jose<4.0.0",
-    "mock==3.0.5",
+    "mock<=3.0.5",
     "docker>=2.5.1",
     "jsondiff>=1.1.2",
     "aws-xray-sdk!=0.96,>=0.93",