diff --git a/pyproject.toml b/pyproject.toml
index 2f5e7ec..8408b91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ changelog = "https://ronanb96.github.io/bluetooth-sig-python/community/changelog
 [project.optional-dependencies]
 # test-core: pytest framework (shared by dev, test, and release validation)
 test-core = [
-    "pytest~=8.4",
+    "pytest>=8.4,<10.0",
     # pytest-asyncio 0.24+ has compatibility issues with pytest-markdown-docs
     # Keep <0.24 constraint until pytest-markdown-docs is updated
     "pytest-asyncio>=0.23.0,<0.24",