diff --git a/Gemfile b/Gemfile
index d6867207..fb7d16d4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,7 +37,7 @@ gem 'mysql2', '~> 0.5.4', group: :mysql
 gem 'pg', '~> 1.4.3', group: :postgresql
 
 group :development do
-  gem 'spring', '~> 3'
+  gem 'spring', '~> 4'
   gem 'yard'
 
   gem 'tolk', '~> 4.3.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8f889933..a660a670 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -284,7 +284,7 @@ GEM
       thor (~> 1.0)
       tilt (~> 2.0)
       yard (~> 0.9, >= 0.9.24)
-    spring (3.1.1)
+    spring (4.0.0)
     sprockets (4.1.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -365,7 +365,7 @@ DEPENDENCIES
   sassc-rails (~> 2.1.2)
   simplecov
   solargraph
-  spring (~> 3)
+  spring (~> 4)
   sqlite3
   therubyracer
   tolk (~> 4.3.0)