diff --git a/docs/src/customization.html b/docs/src/customization.html
index 23072dca..63ec3dac 100644
--- a/docs/src/customization.html
+++ b/docs/src/customization.html
@@ -123,7 +123,7 @@
           <p>
             You can find all the CSS variables used in the default theme here:
             <a
-              href="https://github.com/picocss/pico/blob/master/css/themes/default.css"
+              href="https://github.com/picocss/pico/blob/v1-dev/css/themes/default.css"
               >css/themes/default.css</a
             >
           </p>