diff --git a/ci/requirements.txt b/ci/requirements.txt
index 3b62372..7ff5fdc 100644
--- a/ci/requirements.txt
+++ b/ci/requirements.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.8.4
+matplotlib==3.9.0
 numpy==1.26.4
 pandas==2.2.2
 xlrd>=1.0.0
diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index bf31815..d17b580 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.8.4
+matplotlib==3.9.0
 numpy==1.26.4
 pandas==2.2.2
 xlrd>=1.0.0