diff --git a/pyproject.toml b/pyproject.toml
index 4fb3c8b..2946143 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ server = [
     "fastapi",
     "sse-starlette",
 ]
-test = ["pytest"]
+test = ["pytest", "httpx"]
 
 [tool.poetry.dependencies]
 python = "^3.8.1"