diff --git a/Dockerfile b/Dockerfile
index b033427a..dd1302df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6.3
+FROM ruby:2.6.5
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true
diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index 33a06b0e..63df62e9 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,4 +1,4 @@
-FROM ruby:2.6.3-alpine
+FROM ruby:2.6.5-alpine
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true