diff --git a/dot_config/fish/fish_plugins b/dot_config/fish/fish_plugins
index f5b16b5..1c79101 100644
--- a/dot_config/fish/fish_plugins
+++ b/dot_config/fish/fish_plugins
@@ -4,3 +4,4 @@ franciscolourenco/done
 jorgebucaran/autopair.fish
 PatrickF1/fzf.fish
 IlanCosman/tide@v6
+catppuccin/fish
diff --git a/dot_config/fish/private_functions/update_theme.fish b/dot_config/fish/private_functions/update_theme.fish
new file mode 100644
index 0000000..403eff4
--- /dev/null
+++ b/dot_config/fish/private_functions/update_theme.fish
@@ -0,0 +1,7 @@
+function update_theme --on-variable macOS_Theme
+    if [ "$macOS_Theme" = "dark" ]
+        yes | fish_config theme save "Catppuccin Mocha"
+    else if [ "$macOS_Theme" = "light" ]
+        yes | fish_config theme save "Catppuccin Latte"
+    end
+end