diff --git a/.bash/variables.sh b/.bash/variables.sh
index 959d3e0f..8480d4c1 100644
--- a/.bash/variables.sh
+++ b/.bash/variables.sh
@@ -77,5 +77,6 @@ export STARSHIP_CONFIG="$XDG_CONFIG_HOME/starship/config.toml"
 export STARSHIP_CACHE="$XDG_CACHE_HOME/starship"
 export INPUTRC="$XDG_CONFIG_HOME/readline/inputrc"
 export RBENV_ROOT="$XDG_DATA_HOME/rbenv"
+export IRBRC="$XDG_CONFIG_HOME/irb/irbrc"
 
 export GPG_TTY=$(tty)
diff --git a/.zsh/variables.zsh b/.zsh/variables.zsh
index b3c99a42..0504775c 100644
--- a/.zsh/variables.zsh
+++ b/.zsh/variables.zsh
@@ -85,5 +85,6 @@ export STARSHIP_CONFIG="$XDG_CONFIG_HOME/starship/config.toml"
 export STARSHIP_CACHE="$XDG_CACHE_HOME/starship"
 export INPUTRC="$XDG_CONFIG_HOME/readline/inputrc"
 export RBENV_ROOT="$XDG_DATA_HOME/rbenv"
+export IRBRC="$XDG_CONFIG_HOME/irb/irbrc"
 
 export GPG_TTY=$(tty)
diff --git a/bin/put_settings.sh b/bin/put_settings.sh
index 5ff0ad29..9dd40178 100755
--- a/bin/put_settings.sh
+++ b/bin/put_settings.sh
@@ -36,7 +36,7 @@ if [ -d "$SETTINGS_PATH/.vim" ]; then
   ln -s "$SETTINGS_PATH/.vim" "$XDG_CONFIG_HOME/nvim"
 fi
 
-for app in "git" "starship" "lsd" "sheldon" "bundle" "readline" "gem" "rspec" "tmux"; do
+for app in "git" "starship" "lsd" "sheldon" "bundle" "readline" "gem" "irb" "rspec" "tmux"; do
   if [ -L "$XDG_CONFIG_HOME/$app" ]; then
     unlink "$XDG_CONFIG_HOME/$app"
   fi
@@ -68,6 +68,10 @@ for app in "git" "starship" "lsd" "sheldon" "bundle" "readline" "gem" "rspec" "t
       fi
     done
   fi
+
+  if [ "$app" = "irb" ] && [ ! -d "$XDG_DATA_HOME/$app" ]; then
+    mkdir --parents "$XDG_DATA_HOME/$app"
+  fi
 done
 unset -v app
 unset -v shell
@@ -85,13 +89,6 @@ find "$SETTINGS_PATH"/.* -maxdepth 0 -type f -exec sh -c '
     ln -s "$dot_file" "$HOME/$dot_filename"
   ' sh {} \;
 
-if [ -L "$HOME/.irbrc" ]; then
-  unlink "$HOME/.irbrc"
-fi
-if [ -f "$GITHUB_REPOSITORIES_PATH/k0kubun/dotfiles/config/.irbrc" ]; then
-  ln -s "$GITHUB_REPOSITORIES_PATH/k0kubun/dotfiles/config/.irbrc" "$HOME/.irbrc"
-fi
-
 if [ -L /etc/my.cnf ]; then
   sudo unlink /etc/my.cnf
 fi
diff --git a/config/irb/irbrc b/config/irb/irbrc
new file mode 100644
index 00000000..41cb5a8e
--- /dev/null
+++ b/config/irb/irbrc
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+autoload :Base64, 'base64'
+autoload :CGI, 'cgi'
+autoload :CSV, 'csv'
+autoload :Digest, 'digest'
+autoload :ERB, 'erb'
+autoload :FileUtils, 'fileutils'
+autoload :JSON, 'json'
+autoload :Pathname, 'pathname'
+autoload :Psych, 'psych'
+autoload :Ripper, 'ripper'
+autoload :SecureRandom, 'securerandom'
+autoload :Shellwords, 'shellwords'
+autoload :StringIO, 'stringio'
+autoload :URI, 'uri/generic' # `autoload :URI, 'uri'` breaks Rails
+autoload :YAML, 'yaml'
+autoload :Zlib, 'zlib'
+
+IRB.conf[:USE_AUTOCOMPLETE] = false
+IRB.conf[:SAVE_HISTORY] = 1000
+IRB.conf[:HISTORY_FILE] = File.join(ENV['XDG_DATA_HOME'], 'irb', 'history')
+if defined?(IRB::Color) # just for consistency
+  clear = "\e[0m"
+  bold = "\e[1m"
+  green = "\e[32m"
+  blue = "\e[34m"
+  cyan = "\e[36m"
+  IRB.conf[:PROMPT][:DEFAULT] = {
+    PROMPT_I: "#{cyan}#{bold}%N#{clear}(#{green}#{bold}%m#{clear})[#{blue}%02n#{clear}:%i]> ",
+    PROMPT_N: "#{cyan}#{bold}%N#{clear}(#{green}#{bold}%m#{clear})[#{blue}%02n#{clear}:%i]> ",
+    PROMPT_S: "#{cyan}#{bold}%N#{clear}(#{green}#{bold}%m#{clear})[#{blue}%02n#{clear}:%i]%l ",
+    PROMPT_C: "#{cyan}#{bold}%N#{clear}(#{green}#{bold}%m#{clear})[#{blue}%02n#{clear}:%i]* ",
+    RETURN: "=> %s\n",
+  }
+end