diff --git a/constraints.txt b/constraints.txt
index 9204abb..2da83be 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -3,4 +3,5 @@ cloudify-utilities-plugins-sdk>=0.0.30
 mock>=1.0
 urllib3==1.24.3
 networkx==1.9.1
-cryptography==3.2.1
\ No newline at end of file
+cryptography==3.2.1
+cffi==1.14.5
\ No newline at end of file