diff --git a/doc/requirements.txt b/doc/requirements.txt
index 60372d03..56f8df5a 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,6 +4,3 @@
 sphinx>=2.0.0,!=2.1.0 # BSD
 openstackdocstheme>=2.2.1 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
-
-sphinxcontrib-blockdiag>=1.5.4 # BSD
-sphinxcontrib-seqdiag>=0.8.4 # BSD