diff --git a/generated.go b/generated.go
index 94efc13..a8b164f 100644
--- a/generated.go
+++ b/generated.go
@@ -141,6 +141,8 @@ var pairMap = map[string]string{
 	"context":               "context.Context",
 	"continuation_token":    "string",
 	"credential":            "string",
+	"default_content_type":  "string",
+	"default_io_callback":   "func([]byte)",
 	"default_service_pairs": "DefaultServicePairs",
 	"default_storage_pairs": "DefaultStoragePairs",
 	"enable_virtual_dir":    "bool",
@@ -472,6 +474,10 @@ type pairStorageNew struct {
 	hasEnableVirtualDir bool
 	EnableVirtualDir    bool
 	// Default pairs
+	hasDefaultContentType bool
+	DefaultContentType    string
+	hasDefaultIoCallback  bool
+	DefaultIoCallback     func([]byte)
 }
 
 // parsePairStorageNew will parse Pair slice into *pairStorageNew
@@ -515,7 +521,19 @@ func parsePairStorageNew(opts []Pair) (pairStorageNew, error) {
 			}
 			result.hasEnableVirtualDir = true
 			result.EnableVirtualDir = true
-			// Default pairs
+		// Default pairs
+		case "default_content_type":
+			if result.hasDefaultContentType {
+				continue
+			}
+			result.hasDefaultContentType = true
+			result.DefaultContentType = v.Value.(string)
+		case "default_io_callback":
+			if result.hasDefaultIoCallback {
+				continue
+			}
+			result.hasDefaultIoCallback = true
+			result.DefaultIoCallback = v.Value.(func([]byte))
 		}
 	}
 
@@ -526,6 +544,15 @@ func parsePairStorageNew(opts []Pair) (pairStorageNew, error) {
 	}
 
 	// Default pairs
+	if result.hasDefaultContentType {
+		result.HasDefaultStoragePairs = true
+		result.DefaultStoragePairs.Write = append(result.DefaultStoragePairs.Write, WithContentType(result.DefaultContentType))
+	}
+	if result.hasDefaultIoCallback {
+		result.HasDefaultStoragePairs = true
+		result.DefaultStoragePairs.Read = append(result.DefaultStoragePairs.Read, WithIoCallback(result.DefaultIoCallback))
+		result.DefaultStoragePairs.Write = append(result.DefaultStoragePairs.Write, WithIoCallback(result.DefaultIoCallback))
+	}
 
 	if !result.HasName {
 		return pairStorageNew{}, services.PairRequiredError{Keys: []string{"name"}}
diff --git a/go.mod b/go.mod
index ce45618..15e3462 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/beyondstorage/go-endpoint v1.1.0
 	github.com/beyondstorage/go-integration-test/v4 v4.3.0
-	github.com/beyondstorage/go-storage/v4 v4.6.0
+	github.com/beyondstorage/go-storage/v4 v4.7.0
 	github.com/google/uuid v1.3.0
 	github.com/huaweicloud/huaweicloud-sdk-go-obs v3.21.1+incompatible
 )
diff --git a/go.sum b/go.sum
index 39bef63..bbf3f01 100644
--- a/go.sum
+++ b/go.sum
@@ -5,8 +5,8 @@ github.com/beyondstorage/go-endpoint v1.1.0/go.mod h1:P2hknaGrziOJJKySv/XnAiVw/d
 github.com/beyondstorage/go-integration-test/v4 v4.3.0 h1:WZ95f78RKlHpvft8zHcMaoa2aaTF/jzlzINhMD0EMHY=
 github.com/beyondstorage/go-integration-test/v4 v4.3.0/go.mod h1:HKgzemQZpxoHBL49JYEUnLTb5eteUhzcvmmPL7EDT/Y=
 github.com/beyondstorage/go-storage/v4 v4.4.0/go.mod h1:mc9VzBImjXDg1/1sLfta2MJH79elfM6m47ZZvZ+q/Uw=
-github.com/beyondstorage/go-storage/v4 v4.6.0 h1:a05dtbYjMZB7LrUSvVzzHwlx33B4yEmd5oQB7Itk7VY=
-github.com/beyondstorage/go-storage/v4 v4.6.0/go.mod h1:mc9VzBImjXDg1/1sLfta2MJH79elfM6m47ZZvZ+q/Uw=
+github.com/beyondstorage/go-storage/v4 v4.7.0 h1:7hpRFNoPY0vWRSH/p2biD2dUQdZMrs1TuIkkqDefmCE=
+github.com/beyondstorage/go-storage/v4 v4.7.0/go.mod h1:mc9VzBImjXDg1/1sLfta2MJH79elfM6m47ZZvZ+q/Uw=
 github.com/dave/dst v0.26.2 h1:lnxLAKI3tx7MgLNVDirFCsDTlTG9nKTk7GcptKcWSwY=
 github.com/dave/dst v0.26.2/go.mod h1:UMDJuIRPfyUCC78eFuB+SV/WI8oDeyFDvM/JR6NI3IU=
 github.com/dave/gopackages v0.0.0-20170318123100-46e7023ec56e/go.mod h1:i00+b/gKdIDIxuLDFob7ustLAVqhsZRk2qVZrArELGQ=