diff --git a/requirements_dev.txt b/requirements_dev.txt
index 27159b5..59c6ee6 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ coverage==5.5
 flake8==3.9.2
 geopandas==0.9.0
 geojson==2.5.0
-matplotlib==3.3.4
+matplotlib==3.4.2
 pip==21.1.2
 pluggy==0.13.1
 pytest==6.2.4