diff --git a/requirements_dev.txt b/requirements_dev.txt
index 53566b2..9c6f4bd 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -26,7 +26,7 @@ pyflakes==2.0.0
 Pygments==2.3.0
 pytz==2018.7
 PyYAML==3.13
-requests==2.20.1
+requests==2.21.0
 six==1.12.0
 snowballstemmer==1.2.1
 Sphinx==1.8.2