diff --git a/setup/tmux.sh b/setup/tmux.sh
index 534d91e..8fe8764 100755
--- a/setup/tmux.sh
+++ b/setup/tmux.sh
@@ -1,3 +1,12 @@
 #!/usr/bin/env bash
 set -eu -o pipefail
 sudo apt-get install -y tmux
+
+mkdir -p "$HOME/.config/tmux"
+cat > "$HOME/.config/tmux/tmux.conf" << 'TMUXCONF'
+set -g default-terminal "tmux-256color"
+set -ag terminal-overrides ",*:Tc"  # true color passthrough
+set -g mouse on
+set -g extended-keys on
+set -g extended-keys-format csi-u               # Kitty keyboard protocol format
+TMUXCONF