diff --git a/poetry.lock b/poetry.lock
index 038e281..0c12b94 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 = "0.28.0"
 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-0.28.0-py3-none-any.whl", hash = "sha256:dc0b419a0cfeb6e8b34e85167c0da2671206f5095f1baa9663d23bcfd6b535fc"},
+    {file = "httpx-0.28.0.tar.gz", hash = "sha256:0858d3bab51ba7e386637f22a61d8ccddaeec5f3fe4209da3a6168dbb91573e0"},
 ]
 
 [package.dependencies]
@@ -440,7 +440,6 @@ anyio = "*"
 certifi = "*"
 httpcore = "==1.*"
 idna = "*"
-sniffio = "*"
 
 [package.extras]
 brotli = ["brotli", "brotlicffi"]
@@ -1395,4 +1394,4 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "887e2680250268c5baaa4e36a2ecd9b62d017be7d29c2eb9613c33976641c41f"
+content-hash = "10658c3a19bd7f11759ebed1b91850c1520edde7534fd298540237df60424e2f"
diff --git a/pyproject.toml b/pyproject.toml
index c61bcd8..5ca3160 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,<0.7.0"
 sphinx = ">=7.3.7,<9.0.0"
 furo = "^2024.5.6"