diff --git a/lib/tracker_api.rb b/lib/tracker_api.rb
index fbebab3..9dfdc80 100644
--- a/lib/tracker_api.rb
+++ b/lib/tracker_api.rb
@@ -4,7 +4,7 @@
 require 'faraday'
 require 'faraday_middleware'
 require 'pathname'
-require 'mimemagic'
+require 'mini_mime'
 
 if defined?(ActiveSupport)
   require 'active_support/core_ext/object/blank'
diff --git a/lib/tracker_api/file_utility.rb b/lib/tracker_api/file_utility.rb
index c957b1c..801110e 100644
--- a/lib/tracker_api/file_utility.rb
+++ b/lib/tracker_api/file_utility.rb
@@ -2,7 +2,7 @@ module TrackerApi
   class FileUtility
     class << self
       def get_file_upload(file)
-        mime_type = MimeMagic.by_path(file)
+        mime_type = MiniMime.lookup_by_filename(file)
         { :file => Faraday::UploadIO.new(file, mime_type) }
       end
 
diff --git a/tracker_api.gemspec b/tracker_api.gemspec
index 6bf2d8d..83c67fc 100644
--- a/tracker_api.gemspec
+++ b/tracker_api.gemspec
@@ -34,5 +34,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'equalizer'
   spec.add_dependency 'representable'
   spec.add_dependency 'multi_json'
-  spec.add_dependency 'mimemagic'
+  spec.add_dependency 'mini_mime'
 end