diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9b3be53e..9e12b503 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 sphinx 
 sphinx-autobuild
 sphinx-rtd-theme 
-myst-parser
+myst-parser==0.18.1