diff --git a/.tmux.conf b/.tmux.conf
index 02acbe9..4b87a8c 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -15,6 +15,8 @@ set -s escape-time 10                     # faster command sequences
 set -sg repeat-time 600                   # increase repeat timeout
 set -s focus-events on
 
+set -ga update-environment SSH_TTY        # OSC 52 escape sequence receiver
+
 set -g prefix2 C-a                        # GNU-Screen compatible prefix
 bind C-a send-prefix -2
 
@@ -104,27 +106,6 @@ bind U run "cut -c3- ~/.tmux.conf | sh -s _urlview #{pane_id}"
 bind F run "cut -c3- ~/.tmux.conf | sh -s _fpp #{pane_id}"
 
 
-# -- list choice (tmux < 2.4) --------------------------------------------------
-
-# vi-choice is gone in tmux >= 2.4
-run -b 'tmux bind -t vi-choice h tree-collapse 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice l tree-expand 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice K start-of-list 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice J end-of-list 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice H tree-collapse-all 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice L tree-expand-all 2> /dev/null || true'
-run -b 'tmux bind -t vi-choice Escape cancel 2> /dev/null || true'
-
-
-# -- edit mode (tmux < 2.4) ----------------------------------------------------
-
-# vi-edit is gone in tmux >= 2.4
-run -b 'tmux bind -ct vi-edit H start-of-line 2> /dev/null || true'
-run -b 'tmux bind -ct vi-edit L end-of-line 2> /dev/null || true'
-run -b 'tmux bind -ct vi-edit q cancel 2> /dev/null || true'
-run -b 'tmux bind -ct vi-edit Escape cancel 2> /dev/null || true'
-
-
 # -- copy mode -----------------------------------------------------------------
 
 bind Enter copy-mode # enter copy mode
@@ -142,15 +123,8 @@ run -b 'tmux bind -T copy-mode-vi H send -X start-of-line 2> /dev/null || true'
 run -b 'tmux bind -t vi-copy L end-of-line 2> /dev/null || true'
 run -b 'tmux bind -T copy-mode-vi L send -X end-of-line 2> /dev/null || true'
 
-# copy to macOS clipboard
-if -b 'command -v pbcopy > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | pbcopy"'
-if -b 'command -v reattach-to-user-namespace > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | reattach-to-user-namespace pbcopy"'
-# copy to X11 clipboard
-if -b 'command -v xsel > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | xsel -i -b"'
-if -b '! command -v xsel > /dev/null 2>&1 && command -v xclip > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | xclip -i -selection clipboard >/dev/null 2>&1"'
-# copy to Windows clipboard
-if -b 'command -v clip.exe > /dev/null 2>&1' 'bind y run -b "tmux save-buffer - | clip.exe"'
-if -b '[ -c /dev/clipboard ]' 'bind y run -b "tmux save-buffer - > /dev/clipboard"'
+# copy to OS clipboard
+bind y run -b 'cut -c3- ~/.tmux.conf | sh -s _copy #{pane_tty}'
 
 
 # -- buffers -------------------------------------------------------------------
@@ -652,6 +626,33 @@ run -b '[ -z "#{window_active}" ] && [ -z "#{version}" ] && tmux set display-tim
 #   esac
 # }
 #
+# _copy() {
+#   tty="$SSH_TTY"
+#   tty=${tty:-$1}
+#   tty=${tty:-$(tmux display -p '#{pane_tty}')}
+#   buffer=${2:-$(tmux save-buffer - || true)}
+#
+#   [ -z "$buffer" ] && return
+#
+#   if [ "$tty" != "$SSH_TTY" ]; then
+#     command -v pbcopy > /dev/null 2>&1 && command='pbcopy'
+#     command -v reattach-to-user-namespace > /dev/null 2>&1 && command='reattach-to-user-namespace pbcopy'
+#     command -v xsel > /dev/null 2>&1 && command='xsel -i -b'
+#     ! command -v xsel > /dev/null 2>&1 && command -v xclip > /dev/null 2>&1 && command='xclip -i -selection clipboard > \/dev\/null 2>\&1'
+#     command -v clip.exe > /dev/null 2>&1 && command='clip\.exe'
+#     [ -c /dev/clipboard ] && command='cat > \/dev\/clipboard'
+#
+#     if [ -n "$command" ]; then
+#       printf %s "$buffer" | $command
+#       return
+#     fi
+#   fi
+#
+#   # OSC 52
+#   # see https://chromium.googlesource.com/apps/libapps/+/master/nassh/doc/FAQ.md#Is-OSC-52-aka-clipboard-operations_supported
+#   printf '\033Ptmux;\033\033]52;c;%s\a\033\\' "$(printf %s "$buffer" | head -c 74994 | base64 | tr -d '\r\n')" > "$tty"
+# }
+#
 # _apply_overrides() {
 #   tmux_conf_theme_24b_colour=${tmux_conf_theme_24b_colour:-false}
 #   if _is_enabled "$tmux_conf_theme_24b_colour"; then
@@ -743,6 +744,17 @@ run -b '[ -z "#{window_active}" ] && [ -z "#{version}" ] && tmux set display-tim
 #     fi
 #   fi
 #
+#   tmux_conf_share_remote_clipboard=${tmux_conf_share_remote_clipboard:-false}
+#   if _is_enabled "$tmux_conf_share_remote_clipboard"; then
+#     if [ -n "$command" ]; then
+#       if _is_enabled "$tmux_conf_copy_to_os_clipboard"; then
+#         perl -p -i -e "s/\bcopy-selection(-and-cancel)?\b '$command'/$& cut -c3- ~\/\.tmux.conf | sh -s _copy #{pane_tty}/g" "$cfg"
+#       else
+#         perl -p -i -e "s/cut -c3- ~\/\.tmux.conf | sh -s _copy #\{pane_tty\}$//g" "$cfg"
+#       fi
+#     fi
+#   fi
+#
 #   # until tmux >= 3.0, output of tmux list-keys can't be consumed back by tmux source-file without applying some escapings
 #   awk < "$cfg" \
 #     '{i = $2 == "-T" ? 4 : 5; gsub(/^[;]$/, "\\\\&", $i); gsub(/^[$"#~]$/, "'"'"'&'"'"'", $i); gsub(/^['"'"']$/, "\"&\"", $i); print}' > "$cfg.in"
diff --git a/.tmux.conf.local b/.tmux.conf.local
index 53b94c7..f367d06 100644
--- a/.tmux.conf.local
+++ b/.tmux.conf.local
@@ -4,16 +4,6 @@
 #         Copyright 2012— Gregory Pakosz (@gpakosz).
 
 
-# -- navigation ----------------------------------------------------------------
-
-# if you're running tmux within iTerm2
-#   - and tmux is 1.9 or 1.9a
-#   - and iTerm2 is configured to let option key act as +Esc
-#   - and iTerm2 is configured to send [1;9A -> [1;9D for option + arrow keys
-# then uncomment the following line to make Meta + arrow keys mapping work
-#set -ga terminal-overrides "*:kUP3=\e[1;9A,*:kDN3=\e[1;9B,*:kRIT3=\e[1;9C,*:kLFT3=\e[1;9D"
-
-
 # -- windows & pane creation ---------------------------------------------------
 
 # new window retains current path, possible values are:
@@ -39,7 +29,7 @@ tmux_conf_new_session_prompt=false
 
 # -- display -------------------------------------------------------------------
 
-# RGB 24-bit colour support (tmux >= 2.2), possible values are:
+# RGB 24-bit colour support, possible values are:
 #  - true
 #  - false (default)
 tmux_conf_theme_24b_colour=false
@@ -48,7 +38,7 @@ tmux_conf_theme_24b_colour=false
 tmux_conf_theme_window_fg='default'
 tmux_conf_theme_window_bg='default'
 
-# highlight focused pane (tmux >= 2.1), possible values are:
+# highlight focused pane, possible values are:
 #   - true
 #   - false (default)
 tmux_conf_theme_highlight_focused_pane=false
@@ -266,10 +256,22 @@ tmux_conf_theme_clock_style='24'
 # in copy mode, copying selection also copies to the OS clipboard
 #   - true
 #   - false (default)
+#
 # on macOS, this requires installing reattach-to-user-namespace, see README.md
-# on Linux, this requires xsel or xclip
+# on operating systems running X.org, this requires installing xsel or xclip
+# on Windows, clip.exe is used
+# on Cygwin, /dev/clipboard is used
 tmux_conf_copy_to_os_clipboard=false
 
+# when connecting to a remote tmux session running this configuration, copied
+# text will be sent back to the local clipboard using the OSC 52 escape sequence
+#   - true
+#   - false (default)
+#
+# this requires set-clipboard to be set to 'on' or 'external' (default)
+# this requires having a terminal that emulator that understands the OSC 5
+# escape sequence
+tmux_conf_share_remote_clipboard=false
 
 # -- user customizations -------------------------------------------------------
 # this is the place to override or undo settings
diff --git a/README.md b/README.md
index 470007d..19a6704 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,7 @@ Installation
 
 Requirements:
 
-  - tmux **`>= 2.1`** (soon `>= 2.4`) running inside Linux, Mac, OpenBSD, Cygwin
-    or WSL
+  - tmux **`>= 2.4`** running inside Linux, Mac, OpenBSD, Cygwin or WSL
   - awk, perl and sed
   - outside of tmux, `$TERM` must be set to `xterm-256color`
 
@@ -99,7 +98,7 @@ Features
    if available
  - laptop battery status line information
  - uptime status line information
- - optional highlight of focused pane (tmux `>= 2.1`)
+ - optional highlight of focused pane
  - configurable new windows and panes behavior (optionally retain current path)
  - SSH/Mosh aware split pane (reconnects to remote server)
  - copy to OS clipboard (needs [`reattach-to-user-namespace`][reattach-to-user-namespace]