diff --git a/ci/requirements.txt b/ci/requirements.txt
index 7f291a7..d4f7553 100644
--- a/ci/requirements.txt
+++ b/ci/requirements.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.9.0
+matplotlib==3.9.1
 numpy==2.0.0
 pandas==2.2.2
 xlrd>=1.0.0
diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index 2aeaa3e..fb0fa9c 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -1,5 +1,5 @@
 #python>=3.8
-matplotlib==3.9.0
+matplotlib==3.9.1
 numpy==2.0.0
 pandas==2.2.2
 xlrd>=1.0.0