diff --git a/requirements_dev.txt b/requirements_dev.txt
index c3d1a82..6661603 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -11,6 +11,6 @@ pytest-sugar==0.9.4
 coveralls==2.1.2
 ase==3.20.1
 git+https://github.com/atomistic-machine-learning/schnetpack.git
-sphinx==3.2.1
+sphinx==3.3.0
 sphinx-rtd-theme==0.5.0
 git+https://github.com/crossnox/m2r@dev#egg=m2r