diff --git a/package.json b/package.json
index bfbab3a..3e95ee9 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "@babel/preset-env": "7.29.5",
     "@codecov/webpack-plugin": "2.0.1",
     "@eslint/js": "10.0.1",
-    "@jest/globals": "30.3.0",
+    "@jest/globals": "30.4.1",
     "babel-loader": "10.1.1",
     "clean-jsdoc-theme": "4.3.2",
     "cross-env": "10.1.0",
@@ -36,8 +36,8 @@
     "eslint": "10.3.0",
     "eslint-plugin-jest": "29.15.2",
     "globals": "17.6.0",
-    "jest": "30.3.0",
-    "jest-environment-jsdom": "30.3.0",
+    "jest": "30.4.2",
+    "jest-environment-jsdom": "30.4.1",
     "jest-junit": "17.0.0",
     "jsdoc": "4.0.5",
     "mini-css-extract-plugin": "2.10.2",
@@ -45,12 +45,12 @@
     "npm-run-all2": "8.0.4",
     "postcss": "8.5.14",
     "postcss-loader": "8.2.1",
-    "postcss-preset-env": "11.2.1",
+    "postcss-preset-env": "11.3.0",
     "sass": "1.99.0",
-    "sass-loader": "16.0.7",
+    "sass-loader": "16.0.8",
     "webpack": "5.106.2",
     "webpack-cli": "7.0.2",
-    "webpack-dev-server": "5.2.3"
+    "webpack-dev-server": "5.2.4"
   },
   "jest": {
     "collectCoverageFrom": [
diff --git a/tests/sleep.test.js b/tests/sleep.test.js
index 8c5ef74..f0649e5 100644
--- a/tests/sleep.test.js
+++ b/tests/sleep.test.js
@@ -26,7 +26,7 @@ describe('sleep function', () => {
         [2000], // 2 seconds
         [60000], // 60 seconds
     ])('resolves after %i milliseconds', async (delay) => {
-        let delay_value = delay[0];
+        const delay_value = delay;
         const sleepPromise = sleep(delay_value);
         jest.advanceTimersByTime(delay_value);
         await sleepPromise;