diff --git a/HISTORY.md b/HISTORY.md
index e556a70a..a0468afe 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+# 4.0.2 / 2020-09-01
+
+- Replace @ndhoule/foldl with Array.prototype.reduce
+
 # 4.0.1 / 2020-08-21
 
 - Minor version bump since previous version was published incorrectly. No code change.
diff --git a/lib/analytics.ts b/lib/analytics.ts
index 959fa4f7..80f7d8b5 100644
--- a/lib/analytics.ts
+++ b/lib/analytics.ts
@@ -939,17 +939,13 @@ Analytics.prototype._parseQuery = function(query: string): SegmentAnalytics {
   function pickPrefix(prefix: string, object: object) {
     var length = prefix.length;
     var sub;
-    return foldl(
-      function(acc, val, key) {
-        if (key.substr(0, length) === prefix) {
-          sub = key.substr(length);
-          acc[sub] = val;
-        }
-        return acc;
-      },
-      {},
-      object
-    );
+    return Object.keys(object).reduce(function(acc, key) {
+      if (key.substr(0, length) === prefix) {
+        sub = key.substr(length);
+        acc[sub] = object[key];
+      }
+      return acc;
+    }, {});
   }
 };
 
diff --git a/package.json b/package.json
index ca4b9c8e..f7af3575 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,6 @@
   "dependencies": {
     "@ndhoule/defaults": "^2.0.1",
     "@ndhoule/extend": "^2.0.0",
-    "@ndhoule/foldl": "^2.0.1",
     "@ndhoule/includes": "^2.0.1",
     "@ndhoule/keys": "^2.0.0",
     "@ndhoule/pick": "^2.0.0",