diff --git a/requirements-dev.txt b/requirements-dev.txt
index fe0c5db9..405087dd 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-mock==4.0.3
+mock==5.0.1
 nose2[coverage_plugin]==0.12.0
 cov-core==1.15.0
 pycodestyle==2.10.0