diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6af8fa3f..515b5a94 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,6 +1,6 @@
 coverage==6.5.0
 coveralls==3.3.1
-mypy==1.6.1
+mypy==1.9.0
 pytest==8.1.1
 pytest-cov==4.1.0
 pytest-mypy==0.10.3