diff --git a/global-requirements.txt b/global-requirements.txt
index 309d0e06d4..7336e8d56e 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -12,6 +12,7 @@ Babel!=2.4.0  # BSD
 bcrypt  # Apache-2.0
 betamax  # Apache-2.0
 betamax-matchers  # Apache-2.0
+blockdiag!=2.0.0  # Apache-2.0
 boto  # MIT
 boto3  # Apache-2.0
 botocore  # Apache-2.0