diff --git a/.ruby-version b/.ruby-version
index 49cdd668..1f7da99d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.6
+2.7.7
diff --git a/.tool-versions b/.tool-versions
index 1ade7321..33a8789f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1 +1 @@
-ruby 2.7.4
+ruby 2.7.7
diff --git a/Dockerfile b/Dockerfile
index 060193df..35862151 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7.6
+FROM ruby:2.7.7
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true
diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index dcd296a2..03818d14 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,4 +1,4 @@
-FROM ruby:2.7.6-alpine
+FROM ruby:2.7.7-alpine
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true