diff --git a/pyproject.toml b/pyproject.toml
index 0b66598..777ffed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,6 +17,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
+    "httpx==0.28.1",
     "pytest==8.3.4",
     "ruff==0.8.6",
 ]