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+## General Upgrades
+
+### yarn
+
+- Remove `yarn.lock` file before upgrade
+
+### npm
+
+- Remove `package-lock.json` file before upgrade
+
+## 2.5.x
+
+### yarn
+
+`yarn add core-js@2 node-fetch@2`
+
+### npm
+
+`npm i core-js@2 node-fetch@2`
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