diff --git a/pyproject.toml b/pyproject.toml
index eb1030a..874230d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ Source = "https://github.com/jkowalleck/rfc3987-syntax2"
 
 [project.optional-dependencies]
 testing = [
-    "mypy>=1.15,<2",
+    "mypy>=1.15,<3",
     "typing_extensions>=4.16.0",
     "pytest>=8.3.5",
 ]