diff --git a/poetry.lock b/poetry.lock
index ca7d893..6603d4a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -832,4 +832,4 @@ dev = ["black (>=19.3b0) ; python_version >= \"3.6\"", "pytest (>=4.6.2)"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.10"
-content-hash = "2b2ac715bba6861ebd7994ae13b5838a56fbcc50a9dd8623c9b9cfe9261bb1ca"
+content-hash = "d42722164827e5479bf688fa4bab19e6fb9853e6cc09a5a73f803a7299135c93"
diff --git a/pyproject.toml b/pyproject.toml
index 47eee6f..a138cb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ pytest = "^9.0.2"
 pytest-cov = "^7.1.0"
 hypothesis = "^6.151.10"
 coverage = "^7.13.5"
-mypy = "^1.20.0"
+mypy = ">=1.20.0,<2"
 ruff = "^0.15.8"
 
 [tool.poetry.scripts]