diff --git a/gulpfile.js b/gulpfile.js
index dfd17d3a3..f2ad920f3 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -74,8 +74,6 @@ gulp.task('pack-browser', function () {
 		.exclude('path')
 		.exclude('balena-settings-client')
 		.exclude('node-localstorage')
-		.exclude('formdata-node')
-		.exclude('form-data-encoder')
 		.bundle();
 
 	return bundle
diff --git a/karma.conf.js b/karma.conf.js
index 9a16fdf56..1091848d0 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -41,8 +41,10 @@ module.exports = function (config) {
 		querystring: require.resolve('querystring-es3'),
 		// required by: balena-request
 		stream: require.resolve('stream-browserify'),
-		// required by: balena-request
-		zlib: require.resolve('browserify-zlib'),
+		// required by tmp that we use in tests, but not when running on a browser
+		vm: false,
+		// required by mockttp -> http-encoding
+		zlib: false,
 	};
 	karmaConfig.webpack.plugins = [
 		new getKarmaConfig.webpack.ProvidePlugin({
diff --git a/package.json b/package.json
index 9d385349c..e92b1f1a3 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,6 @@
     "@types/sinon": "^17.0.3",
     "balena-config-karma": "^4.0.0",
     "browserify": "^17.0.0",
-    "browserify-zlib": "^0.2.0",
     "buffer": "^6.0.3",
     "catch-uncommitted": "^2.0.0",
     "chai": "^4.3.6",