diff --git a/pyproject.toml b/pyproject.toml
index 9ff9b496..9e45200f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ nibabel = ["nibabel>=4.0.0"]
 [dependency-groups]
 test = [
     "mypy==1.15.0",
-    "pytest==8.3.5",
+    "pytest==9.0.3",
     "pytest-cov==6.1.1",
     "pytest-flake8==1.3.0",
     "tzdata; platform_system == 'Windows'"