diff --git a/etcdctlv3/command/compaction_command.go b/etcdctlv3/command/compaction_command.go
index 9844b4227..d2cc26f70 100644
--- a/etcdctlv3/command/compaction_command.go
+++ b/etcdctlv3/command/compaction_command.go
@@ -48,7 +48,8 @@ func compactionCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/delete_range_command.go b/etcdctlv3/command/delete_range_command.go
index 874b235dd..b38420fcd 100644
--- a/etcdctlv3/command/delete_range_command.go
+++ b/etcdctlv3/command/delete_range_command.go
@@ -48,7 +48,8 @@ func deleteRangeCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/lease_command.go b/etcdctlv3/command/lease_command.go
index d456859df..e69329218 100644
--- a/etcdctlv3/command/lease_command.go
+++ b/etcdctlv3/command/lease_command.go
@@ -68,7 +68,8 @@ func leaseCreateCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
@@ -110,7 +111,8 @@ func leaseRevokeCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
@@ -152,7 +154,8 @@ func leaseKeepAliveCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/member_command.go b/etcdctlv3/command/member_command.go
index abc6b1b44..65d5421f6 100644
--- a/etcdctlv3/command/member_command.go
+++ b/etcdctlv3/command/member_command.go
@@ -113,7 +113,8 @@ func memberAddCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
@@ -142,7 +143,8 @@ func memberRemoveCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
@@ -177,7 +179,8 @@ func memberUpdateCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
@@ -197,7 +200,8 @@ func memberListCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/put_command.go b/etcdctlv3/command/put_command.go
index 2225aa1fb..40c2fe424 100644
--- a/etcdctlv3/command/put_command.go
+++ b/etcdctlv3/command/put_command.go
@@ -66,7 +66,8 @@ func putCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/range_command.go b/etcdctlv3/command/range_command.go
index 90aec08bf..94f1acef3 100644
--- a/etcdctlv3/command/range_command.go
+++ b/etcdctlv3/command/range_command.go
@@ -92,7 +92,8 @@ func rangeCommandFunc(cmd *cobra.Command, args []string) {
 		ExitWithError(ExitBadFeature, fmt.Errorf("bad sort target %v", rangeSortTarget))
 	}
 
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/txn_command.go b/etcdctlv3/command/txn_command.go
index 535d881ca..dde45576a 100644
--- a/etcdctlv3/command/txn_command.go
+++ b/etcdctlv3/command/txn_command.go
@@ -54,7 +54,8 @@ func txnCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitError, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/etcdctlv3/command/watch_command.go b/etcdctlv3/command/watch_command.go
index 7e512cc5d..c9ccda689 100644
--- a/etcdctlv3/command/watch_command.go
+++ b/etcdctlv3/command/watch_command.go
@@ -43,7 +43,8 @@ func watchCommandFunc(cmd *cobra.Command, args []string) {
 	if err != nil {
 		ExitWithError(ExitInvalidInput, err)
 	}
-	conn, err := grpc.Dial(endpoint)
+	// TODO: enable grpc.WithTransportCredentials(creds)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		ExitWithError(ExitBadConnection, err)
 	}
diff --git a/tools/benchmark/cmd/util.go b/tools/benchmark/cmd/util.go
index 607860dd3..163289e03 100644
--- a/tools/benchmark/cmd/util.go
+++ b/tools/benchmark/cmd/util.go
@@ -33,7 +33,7 @@ func mustCreateConn() *grpc.ClientConn {
 	eps := strings.Split(endpoints, ",")
 	endpoint := eps[dialTotal%len(eps)]
 	dialTotal++
-	conn, err := grpc.Dial(endpoint)
+	conn, err := grpc.Dial(endpoint, grpc.WithInsecure())
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "dial error: %v\n", err)
 		os.Exit(1)