diff --git a/package.json b/package.json
index 3667365..e1cf6cb 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
   "homepage": "https://github.com/Eppo-exp/js-client-sdk-common#readme",
   "devDependencies": {
     "@types/jest": "^29.5.11",
+    "@types/js-base64": "^3.3.1",
     "@types/md5": "^2.3.2",
     "@types/semver": "^7.5.6",
     "@typescript-eslint/eslint-plugin": "^5.13.0",
@@ -63,9 +64,9 @@
     "webpack-cli": "^4.10.0"
   },
   "dependencies": {
+    "js-base64": "^3.7.7",
     "md5": "^2.3.0",
     "pino": "^8.19.0",
-    "semver": "^7.5.4",
-    "universal-base64": "^2.1.0"
+    "semver": "^7.5.4"
   }
 }
diff --git a/src/obfuscation.ts b/src/obfuscation.ts
index 42c2e5f..9cff6ec 100644
--- a/src/obfuscation.ts
+++ b/src/obfuscation.ts
@@ -1,14 +1,14 @@
+import base64 = require('js-base64');
 import * as md5 from 'md5';
-import { decode, encode } from 'universal-base64';
 
 export function getMD5Hash(input: string): string {
   return md5(input);
 }
 
 export function encodeBase64(input: string) {
-  return encode(input);
+  return base64.btoaPolyfill(input);
 }
 
 export function decodeBase64(input: string) {
-  return decode(input);
+  return base64.atobPolyfill(input);
 }
diff --git a/yarn.lock b/yarn.lock
index 9801bf3..c1d7b62 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -747,6 +747,13 @@
     expect "^29.0.0"
     pretty-format "^29.0.0"
 
+"@types/js-base64@^3.3.1":
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/@types/js-base64/-/js-base64-3.3.1.tgz#36c2d6dc126277ea28a4d0599d0cafbf547b51e6"
+  integrity sha512-Zw33oQNAvDdAN9b0IE5stH0y2MylYvtU7VVTKEJPxhyM2q57CVaNJhtJW258ah24NRtaiA23tptUmVn3dmTKpw==
+  dependencies:
+    js-base64 "*"
+
 "@types/jsdom@^20.0.0":
   version "20.0.1"
   resolved "https://registry.npmjs.org/@types/jsdom/-/jsdom-20.0.1.tgz"
@@ -2934,6 +2941,11 @@ jest@^29.7.0:
     import-local "^3.0.2"
     jest-cli "^29.7.0"
 
+js-base64@*, js-base64@^3.7.7:
+  version "3.7.7"
+  resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-3.7.7.tgz#e51b84bf78fbf5702b9541e2cb7bfcb893b43e79"
+  integrity sha512-7rCnleh0z2CkXhH67J8K1Ytz0b2Y+yxTPL+/KOJoa20hfnVQ/3/T6W/KflYI4bRHRagNeXeU2bkNGI3v1oS/lw==
+
 js-tokens@^4.0.0:
   version "4.0.0"
   resolved "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz"
@@ -4105,11 +4117,6 @@ undici-types@~5.26.4:
   resolved "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz"
   integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==
 
-universal-base64@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/universal-base64/-/universal-base64-2.1.0.tgz#511af92b3a07340fc2647036045aadb3bedcc320"
-  integrity sha512-WeOkACVnIXJZr/qlv7++Rl1zuZOHN96v2yS5oleUuv8eJOs5j9M5U3xQEIoWqn1OzIuIcgw0fswxWnUVGDfW6g==
-
 universalify@^0.2.0:
   version "0.2.0"
   resolved "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz"