diff --git a/Dockerfile b/Dockerfile
index 88a6d68..97368e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM mitmproxy/mitmproxy:latest
 EXPOSE 8888 8081
 HEALTHCHECK --interval=10s --timeout=5s --retries=10 --start-period=30s \
-  CMD nc -z localhost 8081 || exit 1
+  CMD bash -c 'echo > /dev/tcp/localhost/8081' || exit 1
 ENTRYPOINT ["mitmweb", "--web-host", "0.0.0.0", "--web-port", "8081", "-p", "8888", "--ssl-insecure", "--set", "web_open_browser=false", "--set", "web_password=mitm"]