diff --git a/pyproject.toml b/pyproject.toml
index 3df158c..7638b4e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ dev = [
     "pytest>=8.1.2",
     "pytest-cov>=5.0.0",
     "mypy>=1.10.0; platform_python_implementation != \"PyPy\"",
-    "mypy<1.19; platform_python_implementation == \"PyPy\"",
+    "mypy<1.20; platform_python_implementation == \"PyPy\"",
     "toml>=0.10.2",
     "tox",
     "black",