diff --git a/.rubocop.yml b/.rubocop.yml
index bb71aa5..4908489 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -16,11 +16,6 @@ AllCops:
     - 'db/migrate/*.rb'
     - 'spec/dummy/**/*'
 
-  # By default, the rails cops are not run. Override in project or home
-  # directory .rubocop.yml files, or by giving the -R/--rails option.
-  Rails:
-    Enabled: true
-
 # Indent private/protected/public as deep as method definitions
 AccessModifierIndentation:
   Description: Check indentation of private/protected visibility modifiers.
diff --git a/.travis.yml b/.travis.yml
index 9940abf..49217ba 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.2.6
-  - 2.3.4
+  - 2.5.7
+  - 2.6.5
 gemfile:
   - gemfiles/4.2.gemfile
   - gemfiles/5.0.gemfile
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 741ea89..3c07a68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,26 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.3.1] - 2019-11-26
+### Added
+- Enforce JPEG content type for carrierwave [Pull Request](https://github.com/xing/pdf_cover/pull/10)
+
+## [0.2.4] - 2017-10-18
+### Added
+- Handle quotes in windows when calling GS [Pull Request](https://github.com/xing/pdf_cover/pull/9)
+
+## [0.2.3] - 2017-08-21
+### Added
+- Remove `dTextAlphaBits` parameter to GS [Pull Request](https://github.com/xing/pdf_cover/pull/8)
+
+## [0.2.3] - 2017-08-21
+### Added
+- Remove `dTextAlphaBits` parameter to GS [Pull Request](https://github.com/xing/pdf_cover/pull/8)
+
+## [0.2.2] - 2017-07-05
+### Added
+- Add support for rails 5 [Pull Request](https://github.com/xing/pdf_cover/pull/7)
+
 ## [0.2.1] - 2016-10-24
 ### Added
 - Add default antialias [Pull Request](https://github.com/xing/pdf_cover/pull/6)
diff --git a/lib/pdf_cover.rb b/lib/pdf_cover.rb
index ba89656..ada4a42 100644
--- a/lib/pdf_cover.rb
+++ b/lib/pdf_cover.rb
@@ -31,6 +31,7 @@ module CarrierWave
       #   end
       def pdf_cover_attachment(options = {})
         process pdf_cover: [options[:quality], options[:resolution]]
+        process enforce_content_type: "image/jpeg"
 
         define_method :full_filename do |for_file = model.logo.file|
           for_file.gsub(/pdf$/i, "jpeg")
@@ -96,4 +97,8 @@ def pdf_cover(quality, resolution)
     converted_file = PdfCover::Converter.new(file, options).converted_file
     FileUtils.cp(converted_file, current_path)
   end
+
+  def enforce_content_type(content_type)
+    file.content_type = content_type
+  end
 end
diff --git a/lib/pdf_cover/version.rb b/lib/pdf_cover/version.rb
index f3a2eb0..d4cbc57 100644
--- a/lib/pdf_cover/version.rb
+++ b/lib/pdf_cover/version.rb
@@ -1,3 +1,3 @@
 module PdfCover
-  VERSION = "0.2.4".freeze
+  VERSION = "0.3.1".freeze
 end
diff --git a/pdf_cover.gemspec b/pdf_cover.gemspec
index 64786c5..25c6e61 100644
--- a/pdf_cover.gemspec
+++ b/pdf_cover.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "activesupport", ">= 4.2"
+  spec.add_development_dependency "activesupport", ">= 4.2", "< 6.0.0"
 
   spec.add_development_dependency "appraisal"
 
@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "simplecov"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rubocop", "~> 0.37.2"
-  spec.add_development_dependency "sqlite3"
+  spec.add_development_dependency "sqlite3", "~> 1.3.6"
 
   spec.add_development_dependency "byebug"
   spec.add_development_dependency "fivemat"
diff --git a/spec/carrierwave/with_carrierwave_spec.rb b/spec/carrierwave/with_carrierwave_spec.rb
index b32b536..ef6416e 100644
--- a/spec/carrierwave/with_carrierwave_spec.rb
+++ b/spec/carrierwave/with_carrierwave_spec.rb
@@ -8,6 +8,7 @@
     let(:pdf_cover) { Magick::Image.read(pdf_cover_path).first }
     let(:pdf_cover_digest) { pdf_cover.signature }
     let(:pdf_cover_path) { subject.pdf.image.path }
+    let(:pdf_cover_content_type) { subject.pdf.image.content_type }
 
     let(:sample_image) { Magick::Image.read(sample_image_name).first }
     let(:sample_image_digest) { sample_image.signature }
@@ -22,6 +23,7 @@
       it "creates the pdf cover image" do
         expect(pdf_cover_path).to match(/.*jpeg$/)
         expect(pdf_cover_digest).to eq(sample_image_digest)
+        expect(pdf_cover_content_type).to eq("image/jpeg")
       end
     end
 
diff --git a/spec/dummy/app/assets/config/manifest.js b/spec/dummy/app/assets/config/manifest.js
new file mode 100644
index 0000000..e69de29
diff --git a/spec/dummy/config/environment.rb b/spec/dummy/config/environment.rb
index f908fa6..71e7c41 100644
--- a/spec/dummy/config/environment.rb
+++ b/spec/dummy/config/environment.rb
@@ -1,5 +1,5 @@
 # Load the Rails application.
-require File.expand_path('../application', __FILE__)
+require File.expand_path("../application", __FILE__)
 
 require "paperclip"
 require "carrierwave"