diff --git a/ci/requirements.txt b/ci/requirements.txt
index 9a959e6..5e303d4 100644
--- a/ci/requirements.txt
+++ b/ci/requirements.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.9.3
+matplotlib==3.9.4
 numpy==2.2.0
 pandas==2.2.3
 xlrd>=1.0.0
diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index f5c4b30..284ab8e 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.9.3
+matplotlib==3.9.4
 numpy==2.2.0
 pandas==2.2.3
 xlrd>=1.0.0