diff --git a/requirements-dev.txt b/requirements-dev.txt
index 49021c3..00da86f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,5 +2,5 @@
 # CI installs `-r requirements.txt` plus pytest directly (see .github/workflows).
 # Keep this in sync with the CI subproject-tests job: only pytest + python-dotenv.
 -r requirements.txt
-pytest==8.3.4
+pytest==9.1.1
 python-dotenv==1.2.2