diff --git a/script/dev-cluster.sh b/script/dev-cluster.sh
index cfe9be0d..101a18bd 100755
--- a/script/dev-cluster.sh
+++ b/script/dev-cluster.sh
@@ -24,11 +24,11 @@ cat > $CONF_PATH <<EOF
 block_size = 1048576			# objects are split in blocks of maximum this number of bytes
 metadata_dir = "/tmp/garage-meta-$count"
 data_dir = "/tmp/garage-data-$count"
-rpc_bind_addr = "127.0.0.$count:3901"		# the port other Garage nodes will use to talk to this node
+rpc_bind_addr = "[::]:$((3900+$count))"		# the port other Garage nodes will use to talk to this node
 bootstrap_peers = [
-  "127.0.0.1:3901",
-  "127.0.0.2:3901",
-  "127.0.0.3:3901"
+  "[::1]:3901",
+  "[::1]:3902",
+  "[::1]:3903"
 ]
 max_concurrent_rpc_requests = 12
 data_replication_factor = 3
@@ -36,11 +36,11 @@ meta_replication_factor = 3
 meta_epidemic_fanout = 3
 
 [s3_api]
-api_bind_addr = "127.0.0.$count:3900"	# the S3 API port, HTTP without TLS. Add a reverse proxy for the TLS part.
+api_bind_addr = "[::]:$((3910+$count))"	# the S3 API port, HTTP without TLS. Add a reverse proxy for the TLS part.
 s3_region = "garage"				# set this to anything. S3 API calls will fail if they are not made against the region set here.
 
 [s3_web]
-bind_addr = "127.0.0.$count:3902"
+bind_addr = "[::]:$((3920+$count))"
 EOF
 
 echo -en "$LABEL configuration written to $CONF_PATH\n"
diff --git a/script/dev-env.sh b/script/dev-env.sh
index f5e71004..88d2941f 100755
--- a/script/dev-env.sh
+++ b/script/dev-env.sh
@@ -10,8 +10,8 @@ ACCESS_KEY=`cat /tmp/garage.s3 |cut -d' ' -f1`
 SECRET_KEY=`cat /tmp/garage.s3 |cut -d' ' -f2`
 
 alias s3grg="s3cmd \
-  --host 127.0.0.1:3900 \
-  --host-bucket 127.0.0.1:3900 \
+  --host 127.0.0.1:3911 \
+  --host-bucket 127.0.0.1:3911 \
   --access_key=$ACCESS_KEY \
   --secret_key=$SECRET_KEY \
   --region=garage \