diff --git a/requirements.txt b/requirements.txt
index 01eb8ecaa..be343f58a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-mkdocs>=0.17.3
-pymdown-extensions>=1.4
-mkdocs-bootswatch>=0.4.0
-mkdocs-material>=2.2.6
+mkdocs==0.17.5
+pymdown-extensions==4.12
+mkdocs-bootswatch==0.5.0
+mkdocs-material==2.9.4