diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index 1dc8fc53..c910947b 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -2,6 +2,8 @@
 
 ## unreleased
 
+## v0.31.3 (2023-02-17)
+
 * Support Psych4/Ruby 3.1 changes to use safe_yaml methods by default [#203](https://github.com/toy/image_optim/issues/203) [#204](https://github.com/toy/image_optim/pull/204) [@oscillot](https://github.com/oscillot) [@toy](https://github.com/toy)
 
 ## v0.31.2 (2022-11-27)
diff --git a/LICENSE.txt b/LICENSE.txt
index f4548bbe..fdeb129b 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,4 +1,4 @@
-Copyright (c) 2012-2022 Ivan Kuchin
+Copyright (c) 2012-2023 Ivan Kuchin
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/README.markdown b/README.markdown
index c20c4dc2..c14fba2f 100644
--- a/README.markdown
+++ b/README.markdown
@@ -390,4 +390,4 @@ In separate file [CHANGELOG.markdown](CHANGELOG.markdown).
 
 ## Copyright
 
-Copyright (c) 2012-2022 Ivan Kuchin. See [LICENSE.txt](LICENSE.txt) for details.
+Copyright (c) 2012-2023 Ivan Kuchin. See [LICENSE.txt](LICENSE.txt) for details.
diff --git a/image_optim.gemspec b/image_optim.gemspec
index e50acf83..cf4bfa36 100644
--- a/image_optim.gemspec
+++ b/image_optim.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name        = 'image_optim'
-  s.version     = '0.31.2'
+  s.version     = '0.31.3'
   s.summary     = %q{Command line tool and ruby interface to optimize (lossless compress, optionally lossy) jpeg, png, gif and svg images using external utilities (advpng, gifsicle, jhead, jpeg-recompress, jpegoptim, jpegrescan, jpegtran, optipng, oxipng, pngcrush, pngout, pngquant, svgo)}
   s.homepage    = "https://github.com/toy/#{s.name}"
   s.authors     = ['Ivan Kuchin']