diff --git a/Dockerfile b/Dockerfile
index 09fba93..d727b50 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ WORKDIR /app
 COPY pyproject.toml ./
 COPY src ./src
 FROM base AS test
-RUN pip install . pytest ruff
+RUN pip install . pytest ruff httpx2
 COPY tests ./tests
 RUN ruff check src tests && pytest -q
 FROM base AS runtime
diff --git a/pyproject.toml b/pyproject.toml
index 6593f4c..d200dfc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,9 @@ dependencies = [
   "python-multipart>=0.0.20,<1", "pillow>=11,<13"
 ]
 
+[project.optional-dependencies]
+test = ["pytest>=9,<10", "ruff>=0.16,<1", "httpx2>=0.1,<1"]
+
 [tool.setuptools.packages.find]
 where = ["src"]