diff --git a/DOCKER_VERSION b/DOCKER_VERSION
index 428b770e..4cda8f19 100644
--- a/DOCKER_VERSION
+++ b/DOCKER_VERSION
@@ -1 +1 @@
-1.4.3
+1.5.2
diff --git a/test/IXWebSocketPingTimeoutTest.cpp b/test/IXWebSocketPingTimeoutTest.cpp
index 5e72a104..80174e35 100644
--- a/test/IXWebSocketPingTimeoutTest.cpp
+++ b/test/IXWebSocketPingTimeoutTest.cpp
@@ -350,7 +350,7 @@ TEST_CASE("Websocket_no_ping_but_timeout", "[setPingTimeout]")
 
         REQUIRE(server.getClients().size() == 1);
 
-        ix::msleep(2900);
+        ix::msleep(2700);
 
         // Here we test ping timeout, no timeout yet
         REQUIRE(serverReceivedPingMessages == 0);
@@ -359,7 +359,7 @@ TEST_CASE("Websocket_no_ping_but_timeout", "[setPingTimeout]")
         REQUIRE(webSocketClient.isClosed() == false);
         REQUIRE(webSocketClient.closedDueToPingTimeout() == false);
 
-        ix::msleep(200);
+        ix::msleep(400);
 
         // Here we test ping timeout, timeout
         REQUIRE(serverReceivedPingMessages == 0);