diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1fb5f7d7..fe87c382 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 matplotlib
 numpy==1.17.3
 pybind11==2.4.3
-sphinx==3.1.1
+sphinx==3.0.4
 sphinx-gallery==0.4.0