diff --git a/VERSION b/VERSION
index ec802c66..26ca5946 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.5.1-dev
+1.5.1
diff --git a/go.mod b/go.mod
index 518f14c9..4f8e639d 100644
--- a/go.mod
+++ b/go.mod
@@ -12,7 +12,7 @@ require (
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826
 	github.com/omec-project/aper v1.2.1
-	github.com/omec-project/config5g v1.5.1
+	github.com/omec-project/config5g v1.5.4
 	github.com/omec-project/nas v1.4.1
 	github.com/omec-project/ngap v1.3.0
 	github.com/omec-project/openapi v1.3.1
diff --git a/go.sum b/go.sum
index 46b39e4a..1b0147ad 100644
--- a/go.sum
+++ b/go.sum
@@ -163,8 +163,8 @@ github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
 github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
 github.com/omec-project/aper v1.2.1 h1:A4KhlTMta5mUA1DX2njOjOn0SuFi5WoWnSqdbRnl9Q8=
 github.com/omec-project/aper v1.2.1/go.mod h1:CbCZ0uNmcD3XA4YM6wBwpqP1PYtGAaC3RqLL4B5gG2U=
-github.com/omec-project/config5g v1.5.1 h1:JaVgr76tnjJIb7Uoesv5a9GI72NdOXtCvfukj0/ONio=
-github.com/omec-project/config5g v1.5.1/go.mod h1:o04ZdwGcM7tbGjuT5t/WzYSKLXOSnFl6vH7b6BGAspU=
+github.com/omec-project/config5g v1.5.4 h1:5JMw5Fsr5qyLZpQi3IZQaQPj78QJMFQXDVS3QDMOY9Y=
+github.com/omec-project/config5g v1.5.4/go.mod h1:HOvQtmi79f8cw35AiFHWHDoCTuZbXfMjeFJWgtPbwaI=
 github.com/omec-project/nas v1.4.1 h1:Ui3k5TnOQ8IGt09qUboaZ05IuMuVSbjZ54Y7iy85iVs=
 github.com/omec-project/nas v1.4.1/go.mod h1:R0x9ehAHi/CUdsMWP+XmefjloEGwobkqz1/c8308yBo=
 github.com/omec-project/ngap v1.3.0 h1:NuAc6GZRup6E3jg+fGTy8aR4VkOlB1mnkaaYr6OGmMc=
diff --git a/service/init.go b/service/init.go
index 581cd1d7..601a2c6c 100644
--- a/service/init.go
+++ b/service/init.go
@@ -40,7 +40,7 @@ import (
 	"github.com/omec-project/amf/producer/callback"
 	"github.com/omec-project/amf/util"
 	aperLogger "github.com/omec-project/aper/logger"
-	gClient "github.com/omec-project/config5g/proto/client"
+	grpcClient "github.com/omec-project/config5g/proto/client"
 	protos "github.com/omec-project/config5g/proto/sdcoreConfig"
 	nasLogger "github.com/omec-project/nas/logger"
 	ngapLogger "github.com/omec-project/ngap/logger"
@@ -144,10 +144,8 @@ func (amf *AMF) Initialize(c *cli.Context) error {
 		factory.AmfConfig.Configuration.ServedGumaiList = nil
 		factory.AmfConfig.Configuration.SupportTAIList = nil
 		factory.AmfConfig.Configuration.PlmnSupportList = nil
-		logger.InitLog.Infoln("reading Amf related configuration from ROC")
-		client := gClient.ConnectToConfigServer(factory.AmfConfig.Configuration.WebuiUri)
-		configChannel := client.PublishOnConfigChange(true)
-		go amf.UpdateConfig(configChannel)
+		logger.InitLog.Infoln("Reading Amf related configuration from ROC")
+		go manageGrpcClient(factory.AmfConfig.Configuration.WebuiUri, amf)
 	} else {
 		go func() {
 			logger.GrpcLog.Infoln("reading Amf Configuration from Helm")
@@ -159,6 +157,58 @@ func (amf *AMF) Initialize(c *cli.Context) error {
 	return nil
 }
 
+// manageGrpcClient connects the config pod GRPC server and subscribes the config changes.
+// Then it updates AMF configuration.
+func manageGrpcClient(webuiUri string, amf *AMF) {
+	var configChannel chan *protos.NetworkSliceResponse
+	var client grpcClient.ConfClient
+	var stream protos.ConfigService_NetworkSliceSubscribeClient
+	var err error
+	count := 0
+	for {
+		if client != nil {
+			if client.CheckGrpcConnectivity() != "ready" {
+				time.Sleep(time.Second * 30)
+				count++
+				if count > 5 {
+					err = client.GetConfigClientConn().Close()
+					if err != nil {
+						logger.InitLog.Infof("failing ConfigClient is not closed properly: %+v", err)
+					}
+					client = nil
+					count = 0
+				}
+				logger.InitLog.Infoln("checking the connectivity readiness")
+				continue
+			}
+
+			if stream == nil {
+				stream, err = client.SubscribeToConfigServer()
+				if err != nil {
+					logger.InitLog.Infof("failing SubscribeToConfigServer: %+v", err)
+					continue
+				}
+			}
+
+			if configChannel == nil {
+				configChannel = client.PublishOnConfigChange(true, stream)
+				logger.InitLog.Infoln("PublishOnConfigChange is triggered")
+				go amf.UpdateConfig(configChannel)
+				logger.InitLog.Infoln("AMF updateConfig is triggered")
+			}
+		} else {
+			client, err = grpcClient.ConnectToConfigServer(webuiUri)
+			stream = nil
+			configChannel = nil
+			logger.InitLog.Infoln("connecting to config server")
+			if err != nil {
+				logger.InitLog.Errorf("%+v", err)
+			}
+			continue
+		}
+	}
+}
+
 func (amf *AMF) WatchConfig() {
 	viper.WatchConfig()
 	viper.OnConfigChange(func(e fsnotify.Event) {