diff --git a/pyproject.toml b/pyproject.toml
index c5357813..371187ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,11 +54,11 @@ build-backend = "hatchling.build"
 dev = [
     "mypy==1.20.0",
     "pre-commit==4.5.1",
-    "pytest==8.4.2",
+    "pytest==9.0.3",
     "ruff>=0.11",
     "pytest-mock==3.15.1",
     "httpx==0.28.*",
-    "pytest-asyncio==0.26.0",
+    "pytest-asyncio==1.3.0",
     "pytest-check==2.8.0",
     "pytest-cov==6.3.0",
     "pytest-pixl==0.2.0rc0",
diff --git a/uv.lock b/uv.lock
index d90c6cad..0c9abe63 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1297,8 +1297,8 @@ dev = [
     { name = "mypy", specifier = "==1.20.0" },
     { name = "nibabel", specifier = "==5.4.2" },
     { name = "pre-commit", specifier = "==4.5.1" },
-    { name = "pytest", specifier = "==8.4.2" },
-    { name = "pytest-asyncio", specifier = "==0.26.0" },
+    { name = "pytest", specifier = "==9.0.3" },
+    { name = "pytest-asyncio", specifier = "==1.3.0" },
     { name = "pytest-check", specifier = "==2.8.0" },
     { name = "pytest-cov", specifier = "==6.3.0" },
     { name = "pytest-mock", specifier = "==3.15.1" },
@@ -1745,7 +1745,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "8.4.2"
+version = "9.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -1754,21 +1754,21 @@ dependencies = [
     { name = "pluggy" },
     { name = "pygments" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/a3/5c/00a0e072241553e1a7496d638deababa67c5058571567b92a7eaa258397c/pytest-8.4.2.tar.gz", hash = "sha256:86c0d0b93306b961d58d62a4db4879f27fe25513d4b969df351abdddb3c30e01", size = 1519618, upload-time = "2025-09-04T14:34:22.711Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a8/a4/20da314d277121d6534b3a980b29035dcd51e6744bd79075a6ce8fa4eb8d/pytest-8.4.2-py3-none-any.whl", hash = "sha256:872f880de3fc3a5bdc88a11b39c9710c3497a547cfa9320bc3c5e62fbf272e79", size = 365750, upload-time = "2025-09-04T14:34:20.226Z" },
+    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
 ]
 
 [[package]]
 name = "pytest-asyncio"
-version = "0.26.0"
+version = "1.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "pytest" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/8e/c4/453c52c659521066969523e87d85d54139bbd17b78f09532fb8eb8cdb58e/pytest_asyncio-0.26.0.tar.gz", hash = "sha256:c4df2a697648241ff39e7f0e4a73050b03f123f760673956cf0d72a4990e312f", size = 54156, upload-time = "2025-03-25T06:22:28.883Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/90/2c/8af215c0f776415f3590cac4f9086ccefd6fd463befeae41cd4d3f193e5a/pytest_asyncio-1.3.0.tar.gz", hash = "sha256:d7f52f36d231b80ee124cd216ffb19369aa168fc10095013c6b014a34d3ee9e5", size = 50087, upload-time = "2025-11-10T16:07:47.256Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/20/7f/338843f449ace853647ace35870874f69a764d251872ed1b4de9f234822c/pytest_asyncio-0.26.0-py3-none-any.whl", hash = "sha256:7b51ed894f4fbea1340262bdae5135797ebbe21d8638978e35d31c6d19f72fb0", size = 19694, upload-time = "2025-03-25T06:22:27.807Z" },
+    { url = "https://files.pythonhosted.org/packages/e5/35/f8b19922b6a25bc0880171a2f1a003eaeb93657475193ab516fd87cac9da/pytest_asyncio-1.3.0-py3-none-any.whl", hash = "sha256:611e26147c7f77640e6d0a92a38ed17c3e9848063698d5c93d5aa7aa11cebff5", size = 15075, upload-time = "2025-11-10T16:07:45.537Z" },
 ]
 
 [[package]]