diff --git a/pyproject.toml b/pyproject.toml
index 31d8a44..2fa0bab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 
 [project.optional-dependencies]
 dev = [
-    "httpx>=0.27",
+    "httpx>=0.28.1",
     "pydantic>=2.0",
     "joserfc>=0.9",
     "pytest>=7.0",