diff --git a/requirements-readthedocs.txt b/requirements-readthedocs.txt
index 5fb300df..ba28dabd 100644
--- a/requirements-readthedocs.txt
+++ b/requirements-readthedocs.txt
@@ -1,3 +1,3 @@
-mkdocs=1.1.2
+mkdocs==1.1.2
 sphinx-rtd-theme
 #readthedocs-sphinx-search