diff --git a/script/dot.fish b/script/dot.fish
index 031fbda..bde325e 100755
--- a/script/dot.fish
+++ b/script/dot.fish
@@ -145,6 +145,10 @@ end
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
+ask_for_sudo
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 # Ensure npm is available.
 
 "$DOT/node/volta.fish"
diff --git a/script/utils.fish b/script/utils.fish
index b857568..d9ae1da 100755
--- a/script/utils.fish
+++ b/script/utils.fish
@@ -156,3 +156,19 @@ end
 function cmd_exists -a cmd
     command -v "$cmd" &>/dev/null
 end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+function ask_for_sudo
+    sudo -v &>/dev/null
+
+    # Update existing 'sudo' timestamp until this script has finished.
+    #
+    # https://gist.github.com/cowboy/3118588
+
+    while true
+        sudo -n true
+        sleep 60
+        kill -0 "$fish_pid" || exit
+    end &>/dev/null &
+end