diff --git a/docs/make.jl b/docs/make.jl
index 9daaf57..70540af 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -7,7 +7,7 @@ makedocs(
 
 deploydocs(
     repo   = "github.com/sunoru/RandomNumbers.jl.git",
-    deps   = Deps.pip("pygments", "mkdocs", "python-markdown-math", "mkdocs-material"),
+    deps   = Deps.pip("pygments", "mkdocs==0.17.5", "python-markdown-math", "mkdocs-material==2.9.4"),
     make = () -> run(`mkdocs build`),
     target = "site"
 )