diff --git a/pyproject.toml b/pyproject.toml
index 88fdf08..51283ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
     'Programming Language :: Python :: 3.11',
 ]
 [project.optional-dependencies]
-test = ["pytest", "pytest-cov", "pytype"]
+test = ["pytest", "pytest-cov", "pytype", "httpx"]
 docs = ["Sphinx<=7.2.4", "sphinx-rtd-theme", "sphinx-click", "autodoc_pydantic"]
 
 [project.scripts]