diff --git a/.ruby-version b/.ruby-version
index 4fd0fe3cd..ec1cf33c3 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.1
\ No newline at end of file
+2.6.3
diff --git a/Gemfile.lock b/Gemfile.lock
index fab069337..565a25f60 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -521,4 +521,4 @@ DEPENDENCIES
   whenever
 
 BUNDLED WITH
-   1.16.1
+   2.0.2
diff --git a/INSTALL.debian b/INSTALL.debian
index 186140348..71d43ac91 100644
--- a/INSTALL.debian
+++ b/INSTALL.debian
@@ -2,7 +2,7 @@
 
 # Run: curl -L -s https://raw.githubusercontent.com/r888888888/danbooru/master/INSTALL.debian -o install.sh ; chmod +x install.sh ; ./install.sh
 
-export RUBY_VERSION=2.5.1
+export RUBY_VERSION=2.6.3
 export GITHUB_INSTALL_SCRIPTS=https://raw.githubusercontent.com/r888888888/danbooru/master/script/install
 export VIPS_VERSION=8.7.0
 
diff --git a/config/deploy.rb b/config/deploy.rb
index 794578a47..4ecdfd466 100644
--- a/config/deploy.rb
+++ b/config/deploy.rb
@@ -3,7 +3,6 @@ set :default_stage, "staging"
 set :application, "danbooru"
 set :repo_url,  "git://github.com/r888888888/danbooru.git"
 set :deploy_to, "/var/www/danbooru2"
-set :rbenv_ruby, "2.5.1"
 append :linked_dirs, "log", "tmp/pids", "tmp/cache", "tmp/sockets", "vendor/bundle"
 set :branch, ENV.fetch("branch", "master")
 
diff --git a/config/deploy/production.rb b/config/deploy/production.rb
index ad2d50ccb..006ccbefe 100644
--- a/config/deploy/production.rb
+++ b/config/deploy/production.rb
@@ -1,6 +1,5 @@
 set :user, "danbooru"
 set :rails_env, "production"
-set :rbenv_path, "/home/danbooru/.rbenv"
 append :linked_files, ".env.production"
 
 server "kagamihara", :roles => %w(web app), :primary => true
diff --git a/config/deploy/staging.rb b/config/deploy/staging.rb
index b6a56be37..87527985c 100644
--- a/config/deploy/staging.rb
+++ b/config/deploy/staging.rb
@@ -3,5 +3,4 @@ set :rails_env, "staging"
 server "testbooru.donmai.us", :roles => %w(web app db), :primary => true, :user => "danbooru"
 
 set :linked_files, fetch(:linked_files, []).push(".env.staging")
-set :rbenv_path, "/home/danbooru/.rbenv"
 set :deploy_to, "/var/www/danbooru2"
diff --git a/config/docker/danbooru-base b/config/docker/danbooru-base
index bab4b0794..44e79230e 100644
--- a/config/docker/danbooru-base
+++ b/config/docker/danbooru-base
@@ -1,4 +1,4 @@
-FROM ruby:2.5.1-slim-stretch
+FROM ruby:2.6.3-slim-stretch
 
 ENV DOCKERIZE_VERSION v0.6.1
 ENV VIPS_VERSION 8.7.0
diff --git a/script/install/app_server.sh b/script/install/app_server.sh
index 5b5803593..bb408dd59 100644
--- a/script/install/app_server.sh
+++ b/script/install/app_server.sh
@@ -5,7 +5,7 @@
 #
 # Run: curl -L -s https://raw.githubusercontent.com/r888888888/danbooru/master/script/install/app_server.sh | sh
 
-export RUBY_VERSION=2.5.1
+export RUBY_VERSION=2.6.3
 export GITHUB_INSTALL_SCRIPTS=https://raw.githubusercontent.com/r888888888/danbooru/master/script/install
 export VIPS_VERSION=8.7.0