diff --git a/backend/requirements-dev.txt b/backend/requirements-dev.txt
index c9524fb..a18f679 100644
--- a/backend/requirements-dev.txt
+++ b/backend/requirements-dev.txt
@@ -4,4 +4,4 @@
 # gives you everything needed to run `python -m pytest tests`.
 # The suite stubs the LLM caller, so no API keys are required.
 -r requirements.txt
-pytest>=8,<10
+pytest>=9.1.1,<10