diff --git a/js/.npmignore b/js/.npmignore
index 8ca2975d760..8b8e1ceaf1e 100644
--- a/js/.npmignore
+++ b/js/.npmignore
@@ -3,8 +3,6 @@
 allTests.py
 assets
 bin
-bower.json
-bower_components
 gulp
 gulpfile.js
 index.html
diff --git a/js/BUILDING.md b/js/BUILDING.md
index 4f7b01250e4..ec3ee136c32 100644
--- a/js/BUILDING.md
+++ b/js/BUILDING.md
@@ -22,10 +22,9 @@ supported platforms.
 
 To build Ice for JavaScript you must have the following:
 
-- The `slice2js` compiler from Ice for C++. If you have not built Ice for C++
-  in this source distribution, refer to the
-  [C++ build instructions](../cpp/README.md).
-- Node.js 4.6 or later
+- The `slice2js` compiler from Ice for C++. If you have not built Ice for C++ in this source distribution, refer to the
+  [C++ build instructions](../cpp/BUILDING.md).
+- Node.js 20 or later
 
 ## Building the JavaScript libraries and NodeJS packages
 
diff --git a/js/gulpfile.js b/js/gulpfile.js
index 260e1e49429..496bad5e4bb 100644
--- a/js/gulpfile.js
+++ b/js/gulpfile.js
@@ -286,17 +286,6 @@ gulp.task("test:common:generate",
                     gulp.dest("test/Common")], cb);
           });
 
-gulp.task("test:common:babel",
-          cb =>
-          {
-              pump([gulp.src(["test/Common/Controller.js",
-                              "test/Common/ControllerI.js",
-                              "test/Common/ControllerWorker.js",
-                              "test/Common/TestHelper.js",
-                              "test/Common/run.js"]),
-                    babel({compact: false})], cb);
-          });
-
 gulp.task("test:common:clean",
           cb =>
           {
@@ -346,7 +335,6 @@ gulp.task("test:import:clean",
           });
 
 const testTask = name => name.replace(/\//g, "_");
-const testBabelTask = name => testTask(name) + ":babel";
 const testCleanTask = name => testTask(name) + ":clean";
 const testBuildTask = name => testTask(name) + ":build";
 
diff --git a/js/src/es5/index.js b/js/src/es5/index.js
deleted file mode 100644
index dcd714c820c..00000000000
--- a/js/src/es5/index.js
+++ /dev/null
@@ -1,13 +0,0 @@
-//
-// Copyright (c) ZeroC, Inc. All rights reserved.
-//
-
-require("core-js/stable");
-require("regenerator-runtime/runtime");
-
-module.exports.Ice = require("./Ice/Ice").Ice;
-module.exports.IceMX = require("./Ice/Ice").IceMX;
-module.exports.IceSSL = require("./Ice/Ice").IceSSL;
-module.exports.Glacier2 = require("./Glacier2/Glacier2").Glacier2;
-module.exports.IceGrid = require("./IceGrid/IceGrid").IceGrid;
-module.exports.IceStorm = require("./IceStorm/IceStorm").IceStorm;