diff --git a/README.md b/README.md
index b529430..e05e4a5 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ pandoc2review file > file.re
 
 ## Copyright
 
-Copyright 2020-2021 Kenshi Muto
+Copyright 2020-2023 Kenshi Muto
 
 GNU General Public License Version 2
 
@@ -57,6 +57,9 @@ GNU General Public License Version 2
 - [@takahashim](https://github.com/takahashim)
 
 ## Changelog
+### 1.5.0
+- Support Pandoc 3.
+
 ### 1.4.0
 - Fix an error when empty div block is received.
 - Introduce '--strip-emptydev' to strip empty block `//{-//}`, produced by TeX file.
diff --git a/lib/pandoc2review.rb b/lib/pandoc2review.rb
index 650071f..71a814b 100644
--- a/lib/pandoc2review.rb
+++ b/lib/pandoc2review.rb
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright 2020-2021 Kenshi Muto
+# Copyright 2020-2023 Kenshi Muto
 require 'optparse'
 require 'unicode/eaw'
 require 'pathname'
@@ -55,7 +55,7 @@ def parse_args
     @stripemptydev = nil
     opts = OptionParser.new
     opts.banner = 'Usage: pandoc2review [option] file [file ...]'
-    opts.version = '1.4'
+    opts.version = '1.5'
 
     opts.on('--help', 'Prints this message and quit.') do
       puts opts.help
@@ -74,7 +74,12 @@ def parse_args
       @stripemptydev = true
     end
 
-    opts.parse!(ARGV)
+    begin
+      opts.parse!(ARGV)
+    rescue OptionParser::ParseError
+      puts opts.help
+      exit 1
+    end
     if ARGV.size != 1
       puts opts.help
       exit 0
diff --git a/lua/filters.lua b/lua/filters.lua
index 4dd8880..8338411 100644
--- a/lua/filters.lua
+++ b/lua/filters.lua
@@ -1,3 +1,5 @@
+-- Copyright 2020-2023 atusy and Kenshi Muto
+
 local function review_inline(x)
     return pandoc.RawInline("review", x)
 end
diff --git a/lua/review.lua b/lua/review.lua
index 5b9b825..eca2024 100755
--- a/lua/review.lua
+++ b/lua/review.lua
@@ -1,6 +1,6 @@
 -- -*- coding: utf-8 -*-
 -- Re:VIEW Writer for Pandoc
--- Copyright 2020 Kenshi Muto
+-- Copyright 2020-2023 atusy and Kenshi Muto
 
 -- config
 local config = {
diff --git a/pandoc2review.gemspec b/pandoc2review.gemspec
index 44b557e..f47098f 100644
--- a/pandoc2review.gemspec
+++ b/pandoc2review.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "pandoc2review"
-  spec.version       = "1.4.0"
+  spec.version       = "1.5.0"
   spec.authors       = ["Kenshi Muto"]
   spec.email         = ["kmuto@kmuto.jp"]
   spec.license       = "GPL-2.0"