diff --git a/Dockerfile b/Dockerfile
index 2bfb6dd..b95dd91 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,4 @@
-FROM ruby:2.7.5-alpine
+FROM ruby:3-alpine
 RUN apk --no-cache add git curl
 RUN gem install dpl --pre
-RUN gem install dpl-heroku