diff --git a/pyproject.toml b/pyproject.toml
index e2a79561f..321fd8990 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ actions = [
 ]
 dev = [
     "flit >=3.2.0,<4.0.0",
-    "mypy >=0.921,<1.7",
+    "mypy >=0.921,<1.9",
     "types-pyyaml >=6.0.4,<7.0.0",
     "types-requests >=2.25.6,<3.0.0",
     "pip-audit >=2.5.6,<3.0.0",