5 files changed, 4 insertions, 6 deletions
diff --git a/axlsx.gemspec b/axlsx.gemspec
index 3f8a5008..2b5c96ec 100644
--- a/axlsx.gemspec
+++ b/axlsx.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'nokogiri', '~> 1.10', '>= 1.10.4'
   s.add_runtime_dependency 'rubyzip', '>= 1.3.0', '< 3'
   s.add_runtime_dependency "htmlentities", "~> 4.3", '>= 4.3.4'
-  s.add_runtime_dependency "mimemagic", '~> 0.3'
+  s.add_runtime_dependency "marcel", '~> 1.0'
 
   s.add_development_dependency 'yard', "~> 0.9.8"
   s.add_development_dependency 'kramdown', '~> 2.3'
diff --git a/lib/axlsx.rb b/lib/axlsx.rb
index be4a2cd5..5be3c526 100644
--- a/lib/axlsx.rb
+++ b/lib/axlsx.rb
@@ -1,7 +1,7 @@
 # encoding: UTF-8
 require 'htmlentities'
 require 'axlsx/version.rb'
-require 'mimemagic'
+require 'marcel'
 
 require 'axlsx/util/simple_typed_list.rb'
 require 'axlsx/util/constants.rb'
diff --git a/lib/axlsx/util/mime_type_utils.rb b/lib/axlsx/util/mime_type_utils.rb
index 3fe2dbbd..9ad56630 100644
--- a/lib/axlsx/util/mime_type_utils.rb
+++ b/lib/axlsx/util/mime_type_utils.rb
@@ -5,7 +5,7 @@ module Axlsx
     # @param [String] v File path
     # @return [String] File mime type
     def self.get_mime_type(v)
-      MimeMagic.by_magic(File.open(v)).to_s
+      Marcel::MimeType.for(Pathname.new(v))
     end
   end
 end
diff --git a/test/tc_helper.rb b/test/tc_helper.rb
index 396f19b2..af40a1e4 100644
--- a/test/tc_helper.rb
+++ b/test/tc_helper.rb
@@ -8,5 +8,3 @@ end
 require 'test/unit'
 require "timecop"
 require "axlsx.rb"
-# MIME detection for Microsoft Office 2007+ formats
-require 'mimemagic/overlay'
diff --git a/test/tc_package.rb b/test/tc_package.rb
index d313c2bd..f1ce0421 100644
--- a/test/tc_package.rb
+++ b/test/tc_package.rb
@@ -228,7 +228,7 @@ class TestPackage < Test::Unit::TestCase
   end
 
   def test_serialization_creates_files_with_excel_mime_type
-    assert_equal(MimeMagic.by_magic(@package.to_stream).type,
+    assert_equal(Marcel::MimeType.for(@package.to_stream),
                  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
   end