diff --git a/requirements.txt b/requirements.txt
index 701de1f..ff3bec4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ entrypoints==0.3
 flake8==3.7.7
 future==0.17.1
 kiwisolver==1.0.1
-matplotlib==3.0.3
+matplotlib==3.9.4
 mccabe==0.6.1
 more-itertools==6.0.0
 numpy==1.16.2