diff --git a/dot_tmux.conf b/dot_tmux.conf
index 78bb00e..74dbb4f 100644
--- a/dot_tmux.conf
+++ b/dot_tmux.conf
@@ -11,8 +11,9 @@ set -g history-limit 50000
 set -g display-time 4000
 
 
-# upgrade $TERM
+# screen-256 true color
 set -g default-terminal "screen-256color"
+set -ga terminal-overrides ",xterm-256color:Tc"
 
 # focus events enabled for terminals that support them
 set -g focus-events on
diff --git a/private_dot_config/private_fish/config.fish.tmpl b/private_dot_config/private_fish/config.fish.tmpl
index c30b774..aaeb6ff 100644
--- a/private_dot_config/private_fish/config.fish.tmpl
+++ b/private_dot_config/private_fish/config.fish.tmpl
@@ -3,7 +3,10 @@
 # ===========================================================================
 # requires fisher (https://github.com/jorgebucaran/fisher)
 
+set -gx COLORTERM truecolor
 set -gx EDITOR vim
+set -gx LANG fr_FR.UTF-8
+set -gx LC_ALL fr_FR.UTF-8
 
 # nix
 if test -e $HOME/.nix-profile/etc/profile.d/nix.sh