diff --git a/docs/docs_requirements.txt b/docs/docs_requirements.txt
index 1e55847bf..4db8ae4fe 100644
--- a/docs/docs_requirements.txt
+++ b/docs/docs_requirements.txt
@@ -11,5 +11,5 @@ ipython
 ipython_genutils
 py2jn
 pygraphviz>=1.7
-pandoc
+pandoc>=2.14.2,<4.0.0
 docutils>=0.18