diff --git a/pyproject.toml b/pyproject.toml
index ad075bde..ed102fc8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ classifiers = [
 dependencies = [
     "openai>=1.0.0",
     "anthropic>=0.20.0",
-    "httpx>=0.24.0",
+    "httpx>=0.28.1",
     "pydantic>=2.0.0",
     "pydantic-settings>=2.0.0",
     "python-dotenv>=1.2.2",  # >=1.2.2 clears CVE-2026-28684