diff --git a/client/client_test.go b/client/client_test.go
index 2e9648e..dfcf5e8 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -1,7 +1,6 @@
 package client
 
 import (
-	"encoding/json"
 	"net"
 	"strconv"
 	"sync"
diff --git a/client/httptransport.go b/client/httptransport.go
index aab070d..f559245 100644
--- a/client/httptransport.go
+++ b/client/httptransport.go
@@ -2,7 +2,6 @@ package client
 
 import (
 	"bytes"
-	"encoding/json"
 	"errors"
 	"io/ioutil"
 	"net/http"
diff --git a/client/sockettransport.go b/client/sockettransport.go
index 96bb09f..0a7959f 100644
--- a/client/sockettransport.go
+++ b/client/sockettransport.go
@@ -1,7 +1,6 @@
 package client
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -11,8 +10,11 @@ import (
 
 	"github.com/foomo/contentserver/responses"
 	"github.com/foomo/contentserver/server"
+	jsoniter "github.com/json-iterator/go"
 )
 
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 type serverResponse struct {
 	Reply interface{}
 }
diff --git a/repo/loader.go b/repo/loader.go
index d562f44..0aa522a 100644
--- a/repo/loader.go
+++ b/repo/loader.go
@@ -1,7 +1,6 @@
 package repo
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -10,8 +9,11 @@ import (
 
 	"github.com/foomo/contentserver/content"
 	"github.com/foomo/contentserver/log"
+	jsoniter "github.com/json-iterator/go"
 )
 
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 func (repo *Repo) updateRoutine() {
 	go func() {
 		for newDimension := range repo.updateChannel {
diff --git a/server/handlerequest.go b/server/handlerequest.go
index 980bcbb..92fdfec 100644
--- a/server/handlerequest.go
+++ b/server/handlerequest.go
@@ -1,7 +1,6 @@
 package server
 
 import (
-	"encoding/json"
 	"fmt"
 	"time"
 
@@ -10,9 +9,12 @@ import (
 	"github.com/foomo/contentserver/requests"
 	"github.com/foomo/contentserver/responses"
 	"github.com/foomo/contentserver/status"
+	jsoniter "github.com/json-iterator/go"
 	"github.com/prometheus/client_golang/prometheus"
 )
 
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 func handleRequest(r *repo.Repo, handler Handler, jsonBytes []byte, metrics *status.Metrics) (replyBytes []byte, err error) {
 
 	var (
diff --git a/status/healthz.go b/status/healthz.go
index d91c712..dba2936 100644
--- a/status/healthz.go
+++ b/status/healthz.go
@@ -1,13 +1,15 @@
 package status
 
 import (
-	"encoding/json"
 	"fmt"
 	"net/http"
 
 	"github.com/foomo/contentserver/log"
+	jsoniter "github.com/json-iterator/go"
 )
 
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 func RunHealthzHandlerListener(address string, serviceName string) {
 	log.Notice(fmt.Sprintf("starting healthz handler on '%s'" + address))
 	log.Error(http.ListenAndServe(address, HealthzHandler(serviceName)))