diff --git a/requirements.txt b/requirements.txt
index 4836630..cddd5d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ execnet==1.7.1            # via pytest-shutil
 importlib-metadata==1.4.0 # via pytest
 kiwisolver==1.1.0         # via matplotlib
 matplotlib==3.1.2
-mock==3.0.5               # via pytest-shutil
+mock==4.0.1               # via pytest-shutil
 more-itertools==8.1.0     # via pytest
 numpy==1.18.1
 packaging==20.1           # via pytest