diff --git a/pyproject.toml b/pyproject.toml
index 19a0a7c9..ab4d4713 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
 dev = [
     "certifi>=2025.10.5",
     "coverage<8",
-    "mypy<1.19",
+    "mypy<1.20",
     "poethepoet<1",
     "pytest<9",
     "pytz>=2025.2",
diff --git a/setup.py b/setup.py
index 8feb4be4..cd066ff2 100644
--- a/setup.py
+++ b/setup.py
@@ -67,7 +67,7 @@ def read(path):
             'backports.zoneinfo<1; python_version<"3.9"',
             "certifi",
             "createcoverage>=1,<2",
-            "mypy<1.18",
+            "mypy<1.20",
             "poethepoet<1",
             "ruff<0.15",
             "stopit>=1.1.2,<2",