diff --git a/poetry.lock b/poetry.lock
index dc3a114..970fc49 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -426,13 +426,13 @@ trio = ["trio (>=0.22.0,<1.0)"]
 
 [[package]]
 name = "httpx"
-version = "0.27.2"
+version = "0.28.1"
 description = "The next generation HTTP client."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "httpx-0.27.2-py3-none-any.whl", hash = "sha256:7bb2708e112d8fdd7829cd4243970f0c223274051cb35ee80c03301ee29a3df0"},
-    {file = "httpx-0.27.2.tar.gz", hash = "sha256:f7c2be1d2f3c3c3160d441802406b206c2b76f5947b11115e6df10c6c65e66c2"},
+    {file = "httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad"},
+    {file = "httpx-0.28.1.tar.gz", hash = "sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc"},
 ]
 
 [package.dependencies]
@@ -440,7 +440,6 @@ anyio = "*"
 certifi = "*"
 httpcore = "==1.*"
 idna = "*"
-sniffio = "*"
 
 [package.extras]
 brotli = ["brotli", "brotlicffi"]
@@ -1401,4 +1400,4 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "9582323a392b8b23ea11e61f01b79c78d23523919b4b9ce5ca2edf6046215c60"
+content-hash = "1e16ca6f99f8e50307ccabb0a57d04aa95e80ba246eb97c01e5c42f605c7aab0"
diff --git a/pyproject.toml b/pyproject.toml
index ed9793c..c0012b0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ pytest-cov = ">=5,<7"
 pytest-deadfixtures = "^2.2.1"
 pytest-randomly = "^3.12"
 fastapi-slim = ">=0.111,<0.116"
-httpx = "^0.27.0"
+httpx = ">=0.27,<0.29"
 pytest-markdown-docs = ">=0.5.1,<0.8.0"
 sphinx = ">=7.3.7,<9.0.0"
 furo = "^2024.5.6"