diff --git a/readthedocs/doc_builder/python_environments.py b/readthedocs/doc_builder/python_environments.py
index 864e8dbaaaa..47ddd616603 100644
--- a/readthedocs/doc_builder/python_environments.py
+++ b/readthedocs/doc_builder/python_environments.py
@@ -370,7 +370,7 @@ def install_core_requirements(self):
                 self.project.get_feature_value(
                     Feature.DEFAULT_TO_MKDOCS_0_17_3,
                     positive='mkdocs==0.17.3',
-                    negative='mkdocs<1.1',
+                    negative='mkdocs<1.2',
                 ),
             )
         else: