It is always best to use the latest version of your Salesforce or Microsoft Dynamics integration package. You can see in your integration settings if you are on the most up to date package.
If you do need to update your Package Version
STEP 1: Your Salesforce or Microsoft Dynamics administrator should uninstall the Leadfeeder package from your CRM installation. This will delete all of Leadfeeder’s custom entities and any customizations made on top of it.
STEP 2: Once removed you should see "disconnected" in your integration settings. Click “Reconnect” in Leadfeeder, you will receive instructions to install the updated package.
Once all steps are completed and the package is reinstalled you should be running on the most up to date version.