diff --git a/pyproject.toml b/pyproject.toml
index 65dc13e..c78c25a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ dependencies = [
     # Python development
     "black==25.1.0",
     "flake8==7.3.0",
-    "mypy==1.15.0",
+    "mypy==1.20.2",
     "pytest==8.3.5",
     "ipython==9.8.0",
     "mkdocs==1.6.1",