diff --git a/requirements_dev.txt b/requirements_dev.txt
index 695eabf1..aa0bbf4a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -11,7 +11,7 @@ pytest-cov==2.11.1
 pytest-mock<3.5.2
 recommonmark==0.7.1
 requests==2.25.1
-requests-mock==1.8.0
+requests-mock==1.9.1
 sphinx==3.5.4
 sphinx-rtd-theme==0.5.1
 tqdm==4.59.0