diff --git a/pyproject.toml b/pyproject.toml
index 6e8aa62..36a68dc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ desktop = ["pywebview>=5.0,<6"]
 
 # Development tooling: testing + type checking.
 dev = [
-    "pytest>=8,<9",
+    "pytest>=8,<10",
     "mypy>=1.10,<2",
 ]