diff --git a/.gitignore b/.gitignore
index 09b4c415..b6075efe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,4 +15,6 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
-.pryrc
\ No newline at end of file
+.pryrc
+.DS_Store
+*.swp
diff --git a/lib/powerpoint/compression.rb b/lib/powerpoint/compression.rb
index 2ddd977f..93f1b3cb 100644
--- a/lib/powerpoint/compression.rb
+++ b/lib/powerpoint/compression.rb
@@ -10,7 +10,7 @@ def self.decompress_pptx(in_path, out_path)
   end
 
   def self.compress_pptx(in_path, out_path)
-    Zip::File.open(out_path, Zip::File::CREATE) do |zip_file|
+    Zip::File.open(out_path, create: true) do |zip_file|
       Dir.glob("#{in_path}/**/*", ::File::FNM_DOTMATCH).each do |path|
         zip_path = path.gsub("#{in_path}/","")
         next if zip_path == "." || zip_path == ".." || zip_path.match(/DS_Store/)
diff --git a/mise.toml b/mise.toml
new file mode 100644
index 00000000..96bdb30e
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,2 @@
+[tools]
+ruby = "4"
diff --git a/powerpoint.gemspec b/powerpoint.gemspec
index 2277e79c..86d08aed 100644
--- a/powerpoint.gemspec
+++ b/powerpoint.gemspec
@@ -20,12 +20,12 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 1.9.2'
 
-  spec.add_development_dependency "bundler", "~> 1.3"
+  spec.add_development_dependency "bundler", "~> 4"
   spec.add_development_dependency "rake"
-  spec.add_development_dependency 'rspec', '~> 2.13.0'
+  spec.add_development_dependency 'rspec', '~> 3.13.2'
   spec.add_development_dependency 'pry'
 
 
-  spec.add_dependency 'rubyzip', '~> 1'
-  spec.add_dependency 'fastimage', '~> 1'
+  spec.add_dependency 'rubyzip', '~> 3'
+  spec.add_dependency 'fastimage', '~> 2'
 end
diff --git a/samples/pptx/sample.pptx b/samples/pptx/sample.pptx
index 1221afc4..3da56732 100644
Binary files a/samples/pptx/sample.pptx and b/samples/pptx/sample.pptx differ