diff --git a/substrate/.gitlab-ci.yml b/substrate/.gitlab-ci.yml
index bdf614063a..bd4fc65e85 100644
--- a/substrate/.gitlab-ci.yml
+++ b/substrate/.gitlab-ci.yml
@@ -58,7 +58,7 @@ default:
     name: parity-build
 
 .docker-env:                       &docker-env
-  image:                           parity/rust-builder:latest
+  image:                           paritytech/ci-linux:production
   before_script:
     - rustup show
     - cargo --version
diff --git a/substrate/client/network/src/service/tests.rs b/substrate/client/network/src/service/tests.rs
index 8e79ae0e17..b2a91af5bd 100644
--- a/substrate/client/network/src/service/tests.rs
+++ b/substrate/client/network/src/service/tests.rs
@@ -291,7 +291,7 @@ fn lots_of_incoming_peers_works() {
 	// this test ends.
 	let mut background_tasks_to_wait = Vec::new();
 
-	for _ in 0..256 {
+	for _ in 0..32 {
 		let main_node_peer_id = main_node_peer_id.clone();
 
 		let (_dialing_node, event_stream) = build_test_full_node(config::NetworkConfiguration {