1 files changed, 1 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index e82464aa..a708bab0 100644
--- a/setup.py
+++ b/setup.py
@@ -245,7 +245,7 @@ setup(
             "hypothesis>=1.11.4,!=3.79.2",
         ],
         "docs": [
-            "sphinx >= 1.6.5,!=1.8.0",
+            "sphinx >= 1.6.5,!=1.8.0,!=3.1.0",
             "sphinx_rtd_theme",
         ],
         "docstest": [