diff --git a/requirements.txt b/requirements.txt
index 875e27a94..684bc8ff0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ six==1.10.0
 iso8601==0.1.11
 
 # pin to minor version 3.1.x
-notifications-python-client>=3.1,<3.2
+notifications-python-client==4.3.1
 
 # PaaS
 awscli>=1.11,<1.12