diff --git a/pyproject.toml b/pyproject.toml
index 03f4363..cbc3b0c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "numpy>=1.26.4",
     "pandas>=2.2.3",
     "seaborn>=0.13.2",
-    "matplotlib>=3.10",
+    "matplotlib>=3.9",
     "click>=8.1.8"
 ]
 requires-python = ">=3.9"
diff --git a/requirements.txt b/requirements.txt
index 8c3e608..ba8db04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-matplotlib>=3.10
+matplotlib>=3.9
 numpy>=1.26.4
 pandas>=2.2.3
 requests>=2.31.0