diff --git a/requirements-dev.txt b/requirements-dev.txt
index d5a7369..f38704b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,7 +5,7 @@
 # Runtime deps live in requirements.txt. These are only needed to run
 # the test suite (`pytest firmware/tests/`) and the linter.
 
-pytest>=8.0
+pytest>=9.1.1
 ruff>=0.6          # lint (CI pins its own version)
 
 # Optional: ESPHome itself. The firmware tests that compile/validate the
diff --git a/requirements.lock.txt b/requirements.lock.txt
index 001310c..5e1082c 100644
--- a/requirements.lock.txt
+++ b/requirements.lock.txt
@@ -14,7 +14,7 @@ pytest-asyncio==1.3.0
 pytest-benchmark==5.2.3
 pytest-cov==7.0.0
 pytest-xdist==3.8.0
-pytest==9.0.1
+pytest==9.1.1
 ruff==0.16.0
 scipy==1.16.3
 shapely==2.1.2