diff --git a/lib/review/pdfmaker.rb b/lib/review/pdfmaker.rb
index aa9fd6cd..0c480fa5 100644
--- a/lib/review/pdfmaker.rb
+++ b/lib/review/pdfmaker.rb
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2023 Kenshi Muto and Masayoshi Takahashi
+# Copyright (c) 2010-2024 Kenshi Muto and Masayoshi Takahashi
 #
 # This program is free software.
 # You can distribute or modify this program under the terms of
diff --git a/review.gemspec b/review.gemspec
index 5e8fdaf1..0dbe77e4 100644
--- a/review.gemspec
+++ b/review.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency('rouge')
   gem.add_dependency('rubyzip')
   gem.add_dependency('tty-logger')
-  gem.add_development_dependency('mini_magick')
+  gem.add_development_dependency('mini_magick', '~> 5.0.0')
   gem.add_development_dependency('playwright-runner')
   gem.add_development_dependency('pygments.rb')
   gem.add_development_dependency('rake')