diff --git a/server/etcdmain/etcd.go b/server/etcdmain/etcd.go
index c90557a5a..eb2585699 100644
--- a/server/etcdmain/etcd.go
+++ b/server/etcdmain/etcd.go
@@ -463,7 +463,7 @@ func identifyDataDirOrDie(lg *zap.Logger, dir string) dirType {
 }
 
 func checkSupportArch() {
-	// to add a new platform, check https://github.com/etcd-io/website/blob/master/content/en/docs/next/op-guide/supported-platform.md
+	// to add a new platform, check https://github.com/etcd-io/website/blob/main/content/en/docs/next/op-guide/supported-platform.md
 	if runtime.GOARCH == "amd64" ||
 		runtime.GOARCH == "arm64" ||
 		runtime.GOARCH == "ppc64le" ||
diff --git a/server/etcdserver/api/membership/cluster.go b/server/etcdserver/api/membership/cluster.go
index b570bc699..7fa9c67f2 100644
--- a/server/etcdserver/api/membership/cluster.go
+++ b/server/etcdserver/api/membership/cluster.go
@@ -563,7 +563,7 @@ func (c *RaftCluster) IsReadyToAddVotingMember() bool {
 
 	if nstarted == 1 && nmembers == 2 {
 		// a case of adding a new node to 1-member cluster for restoring cluster data
-		// https://github.com/etcd-io/website/blob/master/content/docs/v2/admin_guide.md#restoring-the-cluster
+		// https://github.com/etcd-io/website/blob/main/content/docs/v2/admin_guide.md#restoring-the-cluster
 		c.lg.Debug("number of started member is 1; can accept add member request")
 		return true
 	}
diff --git a/server/etcdserver/api/v2error/error.go b/server/etcdserver/api/v2error/error.go
index a84572f40..623863254 100644
--- a/server/etcdserver/api/v2error/error.go
+++ b/server/etcdserver/api/v2error/error.go
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // Package v2error describes errors in etcd project. When any change happens,
-// https://github.com/etcd-io/website/blob/master/content/docs/v2/errorcode.md
+// https://github.com/etcd-io/website/blob/main/content/docs/v2/errorcode.md
 // needs to be updated correspondingly.
 // To be deprecated in favor of v3 APIs.
 package v2error