diff --git a/setup.py b/setup.py
index ce7b3fe3..99b45c7e 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 docs_requires = [
     "mkautodoc",
-    "mkdocs<1.3",
+    "mkdocs<1.4",
     "portray",
 ]