diff --git a/Gemfile b/Gemfile
index 6bf9949..e09e5e6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,4 @@
 source "https://rubygems.org"
 
 gemspec
-gem "mime-types", "< 3.0", platforms: [:ruby_19, :jruby_19]
 gem "json", "< 2.0", :platforms=>[:ruby_19, :jruby_19]
diff --git a/Gemfile.lock b/Gemfile.lock
index 7335b09..764d3b4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,9 +30,8 @@ GEM
     launchy (2.4.3-java)
       addressable (~> 2.3)
       spoon (~> 0.0.1)
-    mime-types (2.99.3)
     mini_magick (4.8.0)
-    mini_mime (0.1.4)
+    mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     mustermann (1.0.1)
     nokogiri (1.8.1)
@@ -82,11 +81,10 @@ DEPENDENCIES
   capybara-webkit!
   json (< 2.0)
   launchy
-  mime-types (< 3.0)
   mini_magick
   rake (< 12.0.0)
   rspec (~> 3.5)
   sinatra
 
 BUNDLED WITH
-   1.15.4
+   1.16.0
diff --git a/gemfiles/2.15.gemfile b/gemfiles/2.15.gemfile
index 50207ae..f52cc3b 100644
--- a/gemfiles/2.15.gemfile
+++ b/gemfiles/2.15.gemfile
@@ -2,7 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "mime-types", "< 3.0", platforms: [:ruby_19, :jruby_19]
 gem "json", "< 2.0", platforms: [:ruby_19, :jruby_19]
 gem "capybara", "~> 2.15.0"
 gem "addressable", "< 2.5.0", platforms: [:ruby_19, :jruby_19]
diff --git a/gemfiles/master.gemfile b/gemfiles/master.gemfile
index 12bdbbc..7a2f2c3 100644
--- a/gemfiles/master.gemfile
+++ b/gemfiles/master.gemfile
@@ -2,7 +2,6 @@
 
 source "https://rubygems.org"
 
-gem "mime-types", "< 3.0", platforms: [:ruby_19, :jruby_19]
 gem "json", "< 2.0", platforms: [:ruby_19, :jruby_19]
 gem "capybara", github: "jnicklas/capybara"