diff --git a/requirements.txt b/requirements.txt
index dcff488..8968cdc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,6 @@ Pygments==2.1.1
 pytz==2015.7
 six==1.10.0
 snowballstemmer==1.2.1
-Sphinx==1.3.5
+Sphinx==3.3.0
 sphinx-rtd-theme==0.1.9
 wheel==0.29.0
\ No newline at end of file