diff --git a/pyproject.toml b/pyproject.toml
index 44b9b4e5..6426c986 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ dependencies = [
     "apprise>=1.12.0",
     # HTTP/2 client for RFC 8484 DoH: quad9 rejects HTTP/1.1 outright (505), which
     # requests cannot speak. See shelfmark/download/doh_wireformat.py.
-    "httpx[http2]>=0.27",
+    "httpx[http2]>=0.28.1",
 ]
 
 [project.optional-dependencies]
diff --git a/uv.lock b/uv.lock
index bf29ffc3..362f77c7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1510,7 +1510,7 @@ requires-dist = [
     { name = "gevent" },
     { name = "gevent-websocket" },
     { name = "gunicorn" },
-    { name = "httpx", extras = ["http2"], specifier = ">=0.27" },
+    { name = "httpx", extras = ["http2"], specifier = ">=0.28.1" },
     { name = "psutil" },
     { name = "pyautogui", marker = "extra == 'browser'" },
     { name = "python-socketio" },