diff --git a/.ruby-version b/.ruby-version
index 57cf282e..2c9b4ef4 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.6.5
+2.7.3
diff --git a/Dockerfile b/Dockerfile
index dd1302df..281f1ef8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6.5
+FROM ruby:2.7.3
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true