diff --git a/lower-constraints.txt b/lower-constraints.txt
index 15c0d5c7..95b21540 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -14,7 +14,7 @@ oslo.service==1.31.0
 oslo.utils==4.4.0
 oslotest==3.2.0
 pbr==4.0.0
-pyOpenSSL==20.0.0
+pyOpenSSL==21.0.0
 python-subunit==1.0.0
 requests-mock==1.2.0
 sphinx==2.0.0
diff --git a/requirements.txt b/requirements.txt
index b8012d75..761c0024 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
+cryptography
 pbr>=4.0.0 # Apache-2.0
 
 decorator>=4.4.1 # BSD