Chrome updater keeps getting blocked

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All morning I've been getting notifications that Avast is blocking "http://r4---sn-ab5l6nsy.gvt1.com/edgedl/release2/chrome/ALkDFfBIAql9_64.0.3282.167/64.0.3282.167_64.0.3282.140_chrome_updater.exe?cms_redirect=yes&expire=1518640077&ip=75.127.180.34&ipbits=0&mm=28&mn=sn-ab5l6nsy&ms=nvh&mt=1518625526&mv=m&pl=17&shardbypass=yes"
Why is it being blocked?