diff --git a/requirements.txt b/requirements.txt
index bb79196e..cfd79209 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,7 @@
+blockdiag>=2.0.0
+nwdiag>=2.0.0
+seqdiag>=2.0.0
+actdiag>=2.0.0
 sphinx
 sphinx-sitemap
 sphinx_rtd_theme