diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55efa3d..f4f44e5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
 
       - uses: purescript-contrib/setup-purescript@main
         with:
-          purescript: "0.14.0-rc3"
+          purescript: "0.14.0-rc5"
 
       - uses: actions/setup-node@v1
         with:
diff --git a/src/Control/Extend.js b/src/Control/Extend.js
index 05c8ecf..17a8983 100644
--- a/src/Control/Extend.js
+++ b/src/Control/Extend.js
@@ -2,7 +2,7 @@
 
 exports.arrayExtend = function(f) {
   return function(xs) {
-    return xs.map(function (_, i, xs) {
+    return xs.map(function (_, i) {
       return f(xs.slice(i));
     });
   };