diff --git a/.ruby-version b/.ruby-version
index 8e8299dcc06..437459cd94c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.4.2
+2.5.0
diff --git a/.travis.yml b/.travis.yml
index 59d495c4339..496315558b2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,20 +40,20 @@ addons:
     - yarn
 
 rvm:
-  - 2.3.4
   - 2.4.2
+  - 2.5.0
 
 services:
   - redis-server
 
 install:
+  - gem update --system
   - nvm install
   - bundle install --path=vendor/bundle --without development production --retry=3 --jobs=16
   - yarn install
 
 before_script:
-  - bundle exec rake parallel:create parallel:load_schema parallel:prepare
-  - bundle exec rails assets:precompile
+  - ./bin/rails parallel:create parallel:load_schema parallel:prepare assets:precompile
   - ln -s /usr/bin/x86_64-linux-gnu-g++-6 "$HOME/g++"
 
 script:
diff --git a/Dockerfile b/Dockerfile
index 52ebc84e5a3..765df58c250 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.2-alpine3.6
+FROM ruby:2.5.0-alpine3.7
 
 LABEL maintainer="https://github.com/tootsuite/mastodon" \
       description="A GNU Social-compatible microblogging server"
diff --git a/Gemfile b/Gemfile
index 84578fc36d9..15cd72f2400 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
-ruby '>= 2.3.0', '< 2.5.0'
+ruby '>= 2.3.0', '< 2.6.0'
 
 gem 'pkg-config', '~> 1.2'
 
@@ -28,7 +28,7 @@ gem 'browser'
 gem 'charlock_holmes', '~> 0.7.5'
 gem 'iso-639'
 gem 'cld3', '~> 3.2.0'
-gem 'devise', '~> 4.3'
+gem 'devise', '~> 4.4'
 gem 'devise-two-factor', '~> 3.0'
 gem 'doorkeeper', '~> 4.2'
 gem 'fast_blank', '~> 1.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 12c6d0e475f..788da17fed7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       activesupport
     charlock_holmes (0.7.5)
     chunky_png (1.3.8)
-    cld3 (3.2.1)
+    cld3 (3.2.2)
       ffi (>= 1.1.0, < 1.10.0)
     climate_control (0.2.0)
     cocaine (0.5.8)
@@ -125,7 +125,7 @@ GEM
     css_parser (1.6.0)
       addressable
     debug_inspector (0.0.3)
-    devise (4.3.0)
+    devise (4.4.0)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 4.1.0, < 5.2)
@@ -568,7 +568,7 @@ DEPENDENCIES
   charlock_holmes (~> 0.7.5)
   cld3 (~> 3.2.0)
   climate_control (~> 0.2)
-  devise (~> 4.3)
+  devise (~> 4.4)
   devise-two-factor (~> 3.0)
   doorkeeper (~> 4.2)
   dotenv-rails (~> 2.2)
@@ -649,7 +649,7 @@ DEPENDENCIES
   webpush
 
 RUBY VERSION
-   ruby 2.4.2p198
+   ruby 2.5.0p0
 
 BUNDLED WITH
    1.16.1