diff --git a/bump-version.rb b/bump-version.rb
new file mode 100644
index 0000000..a7c04e7
--- /dev/null
+++ b/bump-version.rb
@@ -0,0 +1,50 @@
+#!/usr/bin/ruby
+
+if not ARGV.empty? then
+    version_str = ARGV.first
+    version_array = ARGV.first.split('.')
+    if version_array.size == 3 then
+        major = version_array[0]
+        minor = version_array[1]
+        patch = version_array[2]
+        puts "Major: #{major}"
+        puts "Minor: #{minor}"
+        puts "Patch: #{patch}"
+
+        script_dir_name = File.expand_path(File.dirname(__FILE__))
+
+        # CMakeLists.txt
+        path_CMakeLists_txt = "#{script_dir_name}/CMakeLists.txt"
+        CMakeLists_txt = File.open(path_CMakeLists_txt, "r").read
+        CMakeLists_txt.sub!(/(set\(GMIO_VERSION_MAJOR\s+)\d+/, "\\1#{major}")
+        CMakeLists_txt.sub!(/(set\(GMIO_VERSION_MINOR\s+)\d+/, "\\1#{minor}")
+        CMakeLists_txt.sub!(/(set\(GMIO_VERSION_PATCH\s+)\d+/, "\\1#{patch}")
+        File.open(path_CMakeLists_txt, "w").write(CMakeLists_txt)
+        puts "Bumped #{path_CMakeLists_txt}"
+
+        # README.md
+        path_README_md = "#{script_dir_name}/README.md"
+        README_md = File.open(path_README_md, "r").read
+        README_md.sub!(
+            /(img\.shields\.io\/badge\/version\-v)\d+\.\d+\.\d+/,
+            "\\1#{version_str}")
+        README_md.gsub!(
+            /(www\.fougue\.pro\/docs\/gmio\/)\d+\.\d+/,
+            "\\1#{major}.#{minor}")
+        File.open(path_README_md, "w").write(README_md)
+        puts "Bumped #{path_README_md}"
+
+        # appveyor.yml
+        path_appveyor_yml = "#{script_dir_name}/appveyor.yml"
+        appveyor_yml = File.open(path_appveyor_yml, "r").read
+        appveyor_yml.sub!(
+            /(version:\s+)\d+\.\d+(_build)/,
+            "\\1#{major}.#{minor}\\2")
+        File.open(path_appveyor_yml, "w").write(appveyor_yml)
+        puts "Bumped #{path_appveyor_yml}"
+    else
+        puts "Error: wrong version format(maj.min.patch)"
+    end
+else
+    puts "Error: no version argument"
+end