diff --git a/pyproject.toml b/pyproject.toml
index 00d5cf0..a26e804 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ dev = [
   "pytest-cov>=5.0",
   "ruff>=0.6",
   "mypy>=1.11",
-  "httpx>=0.27",          # FastAPI TestClient
+  "httpx2>=2.5",          # Starlette/FastAPI TestClient (httpx successor; silences the depr warning)
 ]
 
 [tool.ruff]
diff --git a/uv.lock b/uv.lock
index d7cb584..4fbeaa7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -111,15 +111,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/45/19/cc8bd127d28a43da249aa955cfd164cf8fd534e79e42cea96c4854d72fd0/ast_serialize-0.5.0-cp39-abi3-win_arm64.whl", hash = "sha256:92a31c9c20d25a076edaeec76b128a3535d74a24f340b9a8a7e96c9b86dc9642", size = 1081181, upload-time = "2026-05-17T17:48:28.122Z" },
 ]
 
-[[package]]
-name = "certifi"
-version = "2026.5.20"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/f3/ce/ee2ecad540810a79593028e88299baeae54d346cc7a0d94b6199988b89b1/certifi-2026.5.20.tar.gz", hash = "sha256:69dea482ab64caa7b9f6aba1c6bf48bb6a5448d1c0f1b17ab42ad8c763a5344d", size = 135422, upload-time = "2026-05-20T11:46:50.073Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/59/8c/57e832b7af6d7c5abe66eb3fbe3a3a32f4d11ea23a1aa7131371035be991/certifi-2026.5.20-py3-none-any.whl", hash = "sha256:3c52e209ba0a4ad7aebe60436a4ab349c39e1e602e8c134221e546902ad25897", size = 134134, upload-time = "2026-05-20T11:46:48.578Z" },
-]
-
 [[package]]
 name = "click"
 version = "8.4.1"
@@ -306,16 +297,16 @@ wheels = [
 ]
 
 [[package]]
-name = "httpcore"
-version = "1.0.9"
+name = "httpcore2"
+version = "2.5.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "certifi" },
     { name = "h11" },
+    { name = "truststore" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/06/94/82699a10bca87a5556c9c59b5963f2d039dbd239f25bc2a63907a05a14cb/httpcore-1.0.9.tar.gz", hash = "sha256:6e34463af53fd2ab5d807f399a9b45ea31c3dfa2276f15a2c3f00afff6e176e8", size = 85484, upload-time = "2025-04-24T22:06:22.219Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/47/06/5c12df521b5322fb1114a83d46911b2fbcb8855ddb3a635f11c01a214af5/httpcore2-2.5.0.tar.gz", hash = "sha256:88aa170137c17328d5ac44234f9fd10706466d5fb347f3edac4d39b91137b09d", size = 64808, upload-time = "2026-06-25T14:16:56.472Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/7e/f5/f66802a942d491edb555dd61e3a9961140fd64c90bce1eafd741609d334d/httpcore-1.0.9-py3-none-any.whl", hash = "sha256:2d400746a40668fc9dec9810239072b40b4484b640a8c38fd654a024c7a1bf55", size = 78784, upload-time = "2025-04-24T22:06:20.566Z" },
+    { url = "https://files.pythonhosted.org/packages/c9/a1/7564199d1a8728fe737b0a72e5b3f8d92dfe085a74ddf7cdd83bce5f206d/httpcore2-2.5.0-py3-none-any.whl", hash = "sha256:5ce35188de461d31e8d000bfb8ef8bf22c6c16587a211e5571deaa5e9bdf842a", size = 80330, upload-time = "2026-06-25T14:16:53.634Z" },
 ]
 
 [[package]]
@@ -355,27 +346,28 @@ wheels = [
 ]
 
 [[package]]
-name = "httpx"
-version = "0.28.1"
+name = "httpx2"
+version = "2.5.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
-    { name = "certifi" },
-    { name = "httpcore" },
+    { name = "httpcore2" },
     { name = "idna" },
+    { name = "truststore" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/df/48c586a5fe32a0f01324ee087459e112ebb7224f646c0b5023f5e79e9956/httpx-0.28.1.tar.gz", hash = "sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc", size = 141406, upload-time = "2024-12-06T15:37:23.222Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d0/e2/b5dedc0cf35aa65de5f541ccd30d2bc1fd7f1d43c9ab09f8ed9a7342317b/httpx2-2.5.0.tar.gz", hash = "sha256:e2df9cb4611021527ff8a675b1c320b610a2ec397acc8d6fe6e91df2d9b33c29", size = 83121, upload-time = "2026-06-25T14:16:57.491Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/2a/39/e50c7c3a983047577ee07d2a9e53faf5a69493943ec3f6a384bdc792deb2/httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad", size = 73517, upload-time = "2024-12-06T15:37:21.509Z" },
+    { url = "https://files.pythonhosted.org/packages/31/22/859d8252dad9bc9adee34b52e62cde621ece07b042ccb2ab4da1be46695f/httpx2-2.5.0-py3-none-any.whl", hash = "sha256:3d2d4d9cf4b61f1a1f46a95947cfdb47e80cb56a2f91c6256ac8f58e4891df41", size = 76652, upload-time = "2026-06-25T14:16:55.23Z" },
 ]
 
 [[package]]
 name = "idna"
-version = "3.17"
+version = "3.18"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/b9/28/99c51f664567218d824af024c0251650fb27e4ca066df188dab0769c5b91/idna-3.17.tar.gz", hash = "sha256:5eb0cb53bc467c12eadcf6de83163ad8527cec9416f44b9b61b19caedad2b87f", size = 196048, upload-time = "2026-05-28T14:32:38.55Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/cd/63/9496c57188a2ee585e0f1db071d75089a11e98aa86eb99d9d7618fc1edce/idna-3.18.tar.gz", hash = "sha256:ffb385a7e039654cef1ab9ef32c6fafe283c0c0467bba1d9029738ce4a14a848", size = 196711, upload-time = "2026-06-02T14:34:07.794Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/de/a7/f76514cc40ad6234098ecdebda08732d75964776c51a42845b7da10649e2/idna-3.17-py3-none-any.whl", hash = "sha256:466e48829084efe2548012b855df21540b96f2e20e51bd124c851536556a592c", size = 65316, upload-time = "2026-05-28T14:32:37.035Z" },
+    { url = "https://files.pythonhosted.org/packages/1e/5e/d4e9f1a599fb8e573b7b87160658329fbf28d19eac2718f51fc3def3aa5a/idna-3.18-py3-none-any.whl", hash = "sha256:7f952cbe720b688055e3f87de14f5c3e5fdaa8bc3928985c4077ca689de849a2", size = 65455, upload-time = "2026-06-02T14:34:06.319Z" },
 ]
 
 [[package]]
@@ -872,6 +864,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1c/54/196d0c1db10af76baa4f64894448505d60d3cdf70ef92cbb35f46a4e4c71/starlette-1.2.1-py3-none-any.whl", hash = "sha256:4de0082d08c8f6764a85a54cf1120d6939507a19905c7768acad2a9f875d2b89", size = 73350, upload-time = "2026-05-31T01:07:50.09Z" },
 ]
 
+[[package]]
+name = "truststore"
+version = "0.10.4"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/53/a3/1585216310e344e8102c22482f6060c7a6ea0322b63e026372e6dcefcfd6/truststore-0.10.4.tar.gz", hash = "sha256:9d91bd436463ad5e4ee4aba766628dd6cd7010cf3e2461756b3303710eebc301", size = 26169, upload-time = "2025-08-12T18:49:02.73Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/19/97/56608b2249fe206a67cd573bc93cd9896e1efb9e98bce9c163bcdc704b88/truststore-0.10.4-py3-none-any.whl", hash = "sha256:adaeaecf1cbb5f4de3b1959b42d41f6fab57b2b1666adb59e89cb0b53361d981", size = 18660, upload-time = "2025-08-12T18:49:01.46Z" },
+]
+
 [[package]]
 name = "typer"
 version = "0.26.4"
@@ -1471,7 +1472,7 @@ source = { virtual = "." }
 
 [package.dev-dependencies]
 dev = [
-    { name = "httpx" },
+    { name = "httpx2" },
     { name = "mypy" },
     { name = "pytest" },
     { name = "pytest-cov" },
@@ -1482,7 +1483,7 @@ dev = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "httpx", specifier = ">=0.27" },
+    { name = "httpx2", specifier = ">=2.5" },
     { name = "mypy", specifier = ">=1.11" },
     { name = "pytest", specifier = ">=8.3" },
     { name = "pytest-cov", specifier = ">=5.0" },