diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3e622af..bbd0783 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,5 +8,5 @@ pytest-mock==1.10.0
 tox==3.0.0
 Sphinx==1.7.5
 capturer==2.4
-requests-mock==1.5.0
+requests-mock==1.9.1
 -r requirements.txt