diff --git a/requirements_dev.txt b/requirements_dev.txt
index 4b12397f..e1ef75dc 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@
 #---------------------------------------------------------
 coveralls==3.2.0
 flake8==4.0.1
-pillow==8.3.2
+pillow==8.4.0
 pytest==6.2.5
 pytest-cache==1.0
 pytest-cov==3.0.0