diff --git a/requirements.txt b/requirements.txt
index f807cae..de632ca 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ psd_tools>=1.8.16
 docopt>=0.6.2
 numpy>=1.16.4
 seaborn>=0.9.0
-matplotlib>=3.1.0
+matplotlib>=3.9.4
 Pillow>=6.0.0
 nslr>=0.0.5
 pytest>=4.5.0