diff --git a/package.json b/package.json
index fa7b7a0b1..2d12b9cf7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "protobufjs",
-  "version": "6.3.2",
+  "version": "6.4.0",
   "description": "Protocol Buffers for JavaScript (& TypeScript).",
   "author": "Daniel Wirtz <dcode+protobufjs@dcode.io>",
   "license": "BSD-3-Clause",
diff --git a/src/util/runtime.js b/src/util/runtime.js
index c8d2ed01c..2225cef51 100644
--- a/src/util/runtime.js
+++ b/src/util/runtime.js
@@ -114,23 +114,6 @@ util.longFromHash = function longFromHash(hash, unsigned) {
     return bits.toNumber(Boolean(unsigned));
 };
 
-/**
- * Tests if two possibly long values are not equal.
- * @param {number|Long} a First value
- * @param {number|Long} b Second value
- * @returns {boolean} `true` if not equal
- * @deprecated Use {@link util.longNe|longNe} instead
- */
-util.longNeq = function longNeq(a, b) {
-    return typeof a === "number"
-         ? typeof b === "number"
-            ? a !== b
-            : (a = util.LongBits.fromNumber(a)).lo !== b.low || a.hi !== b.high
-         : typeof b === "number"
-            ? (b = util.LongBits.fromNumber(b)).lo !== a.low || b.hi !== a.high
-            : a.low !== b.low || a.high !== b.high;
-};
-
 /**
  * Tests if a possibily long value equals the specified low and high bits.
  * @param {number|string|Long} val Value to test