diff --git a/package.json b/package.json
index 9adfb8320f652239b7e860b3ed41f4e82dfc5925..0c8898d801c31a75ae14cb545eebcf279c7e4d89 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,7 @@
     "prettier:check": "prettier --check \"**/*.@(cjs|js|ts|tsx|md|json|yml)\"",
     "danger": "danger",
     "test:e2e": "cypress run",
-    "test:core": "cross-env NODE_CONFIG_ENV=test mocha \"core/**/*.spec.js\" \"lib/**/*.spec.js\" \"services/**/*.spec.js\"",
+    "test:core": "cross-env TZ='UTC' NODE_CONFIG_ENV=test mocha \"core/**/*.spec.js\" \"lib/**/*.spec.js\" \"services/**/*.spec.js\"",
     "test:package": "mocha \"badge-maker/**/*.spec.js\"",
     "test:entrypoint": "cross-env NODE_CONFIG_ENV=test mocha entrypoint.spec.js",
     "test:integration": "cross-env NODE_CONFIG_ENV=test mocha \"core/**/*.integration.js\" \"services/**/*.integration.js\"",