diff --git a/go.mod b/go.mod
index 24e201d..307ce95 100644
--- a/go.mod
+++ b/go.mod
@@ -7,5 +7,4 @@ require (
 	github.com/google/uuid v1.2.0
 	github.com/gorilla/mux v1.8.0
 	github.com/influxdata/influxdb-client-go/v2 v2.2.2
-	github.com/pkg/errors v0.9.1
 )
diff --git a/storage/inmemory-storage.go b/storage/inmemory-storage.go
index a297087..9e00e14 100644
--- a/storage/inmemory-storage.go
+++ b/storage/inmemory-storage.go
@@ -1,8 +1,9 @@
 package storage
 
 import (
+	"errors"
+
 	"github.com/google/uuid"
-	"github.com/pkg/errors"
 )
 
 type inmemorySensorRegistry struct {
@@ -16,7 +17,7 @@ func NewInmemorySensorRegistry() *inmemorySensorRegistry {
 
 func (registry *inmemorySensorRegistry) RegisterSensorByName(name string) (*WeatherSensor, error) {
 	if registry.ExistSensorName(name) {
-		return nil, errors.Errorf("Sensorname already exists")
+		return nil, errors.New("Sensorname already exists")
 	}
 	sensor := new(WeatherSensor)
 	sensor.Name = name