diff --git a/Dockerfile b/Dockerfile
index 35abff6..13c8e31 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,4 +14,4 @@ RUN apk add -U ca-certificates libffi libstdc++ && \
 
 EXPOSE 8080
 
-CMD ["gunicorn", "-b", "0.0.0.0:8080", "httpbin:app"]
+CMD ["gunicorn", "-b", "0.0.0.0:8080", "httpbin:app", "-k", "gevent"]
diff --git a/setup.py b/setup.py
index 7f9956b..9c42450 100644
--- a/setup.py
+++ b/setup.py
@@ -35,6 +35,6 @@ setup(
     include_package_data = True, # include files listed in MANIFEST.in
     install_requires=[
         'Flask', 'MarkupSafe', 'decorator', 'itsdangerous', 'six', 'brotlipy',
-        'raven[flask]', 'werkzeug>=0.14.1'
+        'raven[flask]', 'werkzeug>=0.14.1', 'gevent'
     ],
 )