diff --git a/omci_defs.go b/omci_defs.go
index 634d1d3..3062c4a 100644
--- a/omci_defs.go
+++ b/omci_defs.go
@@ -19,8 +19,7 @@
 	"bytes"
 	"encoding/binary"
 	"errors"
-
-	logger "github.com/sirupsen/logrus"
+	"log"
 )
 
 //
@@ -88,10 +87,10 @@
 	r := bytes.NewReader(pkt)
 
 	if err := binary.Read(r, binary.BigEndian, &m); err != nil {
-		logger.Error("binary.Read failed: %s", err)
+		log.Printf("binary.Read failed: %s", err)
 		return 0, 0, 0, 0, 0, OmciContent{}, errors.New("binary.Read failed")
 	}
-	logger.Debug("OmciRun - TransactionId: %d MessageType: %d, ME Class: %d, ME Instance: %d, Content: %x",
+	log.Printf("OmciRun - TransactionId: %d MessageType: %d, ME Class: %d, ME Instance: %d, Content: %x",
 		m.TransactionId, m.MessageType&0x0F, m.MessageId.Class, m.MessageId.Instance, m.Content)
 	return m.TransactionId, m.DeviceId, m.MessageType & 0x0F, m.MessageId.Class, m.MessageId.Instance, m.Content, nil
 }
diff --git a/omci_handlers.go b/omci_handlers.go
index e7e1d68..ef4413a 100644
--- a/omci_handlers.go
+++ b/omci_handlers.go
@@ -19,8 +19,7 @@
 import (
 	"encoding/binary"
 	"errors"
-
-	logger "github.com/sirupsen/logrus"
+	"log"
 )
 
 type OmciMsgHandler func(class OmciClass, content OmciContent, key OnuKey) ([]byte, error)
@@ -38,7 +37,7 @@
 func mibReset(class OmciClass, content OmciContent, key OnuKey) ([]byte, error) {
 	var pkt []byte
 
-	logger.Debug("Omci MibReset")
+	log.Printf("Omci MibReset")
 
 	pkt = []byte{
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
@@ -53,7 +52,7 @@
 func mibUpload(class OmciClass, content OmciContent, key OnuKey) ([]byte, error) {
 	var pkt []byte
 
-	logger.Debug("Omci MibUpload")
+	log.Printf("Omci MibUpload")
 
 	pkt = []byte{
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
@@ -73,7 +72,7 @@
 
 	state := OnuOmciStateMap[key]
 
-	logger.Debug("Omci MibUploadNext %d", state.mibUploadCtr)
+	log.Printf("Omci MibUploadNext %d", state.mibUploadCtr)
 
 	switch state.mibUploadCtr {
 	case 0:
@@ -200,7 +199,7 @@
 		pkt[11] = state.uniGInstance // UNI-G ME Instance
 		state.uniGInstance++
 	default:
-		logger.Error("Invalid MibUpload request %d", state.mibUploadCtr)
+		log.Printf("Invalid MibUpload request %d", state.mibUploadCtr)
 		return nil, errors.New("Invalid MibUpload request")
 	}
 
@@ -219,7 +218,7 @@
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
 
-	logger.Debug("Omci Set")
+	log.Printf("Omci Set")
 
 	return pkt, nil
 }
@@ -229,11 +228,11 @@
 
 	if class == GEMPortNetworkCTP {
 		if onuOmciState, ok := OnuOmciStateMap[key]; !ok {
-			logger.Error("ONU Key Error - IntfId: %d, OnuId:", key.IntfId, key.OnuId)
+			log.Printf("ONU Key Error - IntfId: %d, OnuId:", key.IntfId, key.OnuId)
 			return nil, errors.New("ONU Key Error")
 		} else {
 			onuOmciState.gemPortId = binary.BigEndian.Uint16(content[:2])
-			logger.Debug("Gem Port Id %d", onuOmciState.gemPortId)
+			log.Printf("Gem Port Id %d", onuOmciState.gemPortId)
 			// FIXME
 			OnuOmciStateMap[key].state = DONE
 		}
@@ -247,7 +246,7 @@
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
 
-	logger.Debug("Omci Create")
+	log.Printf("Omci Create")
 
 	return pkt, nil
 }
@@ -263,7 +262,7 @@
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
 
-	logger.Debug("Omci Get")
+	log.Printf("Omci Get")
 
 	return pkt, nil
 }
@@ -279,7 +278,7 @@
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
 
-	logger.Debug("Omci GetAllAlarms")
+	log.Printf("Omci GetAllAlarms")
 
 	return pkt, nil
 }
diff --git a/omci_sim.go b/omci_sim.go
index 8c5a12a..a428cb7 100644
--- a/omci_sim.go
+++ b/omci_sim.go
@@ -16,9 +16,7 @@
 
 package core
 
-import (
-	logger "github.com/sirupsen/logrus"
-)
+import "log"
 
 func OmciSim(intfId uint32, onuId uint32, request []byte) ([]byte, error) {
 	var resp []byte
@@ -28,7 +26,7 @@
 		return resp, &OmciError{"Cannot parse omci msg"}
 	}
 
-	logger.Debug("OmciRun - transactionId: %d msgType: %d, ME Class: %d, ME Instance: %d",
+	log.Printf("OmciRun - transactionId: %d msgType: %d, ME Class: %d, ME Instance: %d",
 		transactionId, msgType, class, instance)
 
 	key := OnuKey{intfId, onuId}
@@ -37,7 +35,7 @@
 	}
 
 	if _, ok := Handlers[msgType]; !ok {
-		logger.Warn("Ignore omci msg (msgType %d not handled)", msgType)
+		log.Printf("Ignore omci msg (msgType %d not handled)", msgType)
 		return resp, &OmciError{"Unimplemented omci msg"}
 	}