diff --git a/docs/requirements.txt b/docs/requirements.txt
index 35f116f37..9c863fec7 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
-mkdocs
+mkdocs==1.1
 git+https://github.com/cmacmackin/markdown-include.git