diff --git a/CHANGELOG.md b/CHANGELOG.md
index 50117d118..7bbcb2b65 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@
     - `CHATMODELDETAILSBITS_4Bits` -> `CHATMODELDETAILSBITS_FOUR_BITS`
     - `CHATMODELDETAILSBITS_8Bits` -> `CHATMODELDETAILSBITS_EIGHT_BITS`
     - `CHATMODELDETAILSBITS_16Bits` -> `CHATMODELDETAILSBITS_SIXTEEN_BITS` 
+- `objectstorage`: [v1.4.0](services/objectstorage/CHANGELOG.md#v140)
+  - **Breaking change:** Set `Expires` field in `CreateAccessKeyResponse` model to NullableString
 - `observability`:
   - [v0.14.0](services/observability/CHANGELOG.md#v0131)
     - **Feature:** Add attributes `JaegerHttpTracesUrl`, `OtlpGrpcTracesUrl` and `OtlpHttpTracesUrl` to `InstanceSensitiveData` model
diff --git a/services/objectstorage/CHANGELOG.md b/services/objectstorage/CHANGELOG.md
index 5a3e2f338..eadc2c151 100644
--- a/services/objectstorage/CHANGELOG.md
+++ b/services/objectstorage/CHANGELOG.md
@@ -1,5 +1,8 @@
+## v1.4.0
+- **Breaking change:** Set `Expires` field in `CreateAccessKeyResponse` model to NullableString
+
 ## v1.3.1
-  - **Dependencies:** Bump `github.com/golang-jwt/jwt/v5` from `v5.2.2` to `v5.2.3`
+- **Dependencies:** Bump `github.com/golang-jwt/jwt/v5` from `v5.2.2` to `v5.2.3`
 
 ## v1.3.0
 - Add `required:"true"` tags to model structs
diff --git a/services/objectstorage/VERSION b/services/objectstorage/VERSION
index 23c38c241..ec7b96782 100644
--- a/services/objectstorage/VERSION
+++ b/services/objectstorage/VERSION
@@ -1 +1 @@
-v1.3.1
\ No newline at end of file
+v1.4.0
\ No newline at end of file
diff --git a/services/objectstorage/model_create_access_key_response.go b/services/objectstorage/model_create_access_key_response.go
index 5c5e8aee4..5ef2b39cb 100644
--- a/services/objectstorage/model_create_access_key_response.go
+++ b/services/objectstorage/model_create_access_key_response.go
@@ -63,22 +63,26 @@ type CreateAccessKeyResponseGetDisplayNameRetType = string
 	types and functions for expires
 */
 
-// isNotNullableString
-type CreateAccessKeyResponseGetExpiresAttributeType = *string
+// isNullableString
+type CreateAccessKeyResponseGetExpiresAttributeType = *NullableString
 
 func getCreateAccessKeyResponseGetExpiresAttributeTypeOk(arg CreateAccessKeyResponseGetExpiresAttributeType) (ret CreateAccessKeyResponseGetExpiresRetType, ok bool) {
 	if arg == nil {
-		return ret, false
+		return nil, false
 	}
-	return *arg, true
+	return arg.Get(), true
 }
 
 func setCreateAccessKeyResponseGetExpiresAttributeType(arg *CreateAccessKeyResponseGetExpiresAttributeType, val CreateAccessKeyResponseGetExpiresRetType) {
-	*arg = &val
+	if IsNil(*arg) {
+		*arg = NewNullableString(val)
+	} else {
+		(*arg).Set(val)
+	}
 }
 
-type CreateAccessKeyResponseGetExpiresArgType = string
-type CreateAccessKeyResponseGetExpiresRetType = string
+type CreateAccessKeyResponseGetExpiresArgType = *string
+type CreateAccessKeyResponseGetExpiresRetType = *string
 
 /*
 	types and functions for keyId
@@ -225,6 +229,7 @@ func (o *CreateAccessKeyResponse) SetDisplayName(v CreateAccessKeyResponseGetDis
 }
 
 // GetExpires returns the Expires field value
+// If the value is explicit nil, the zero value for string will be returned
 func (o *CreateAccessKeyResponse) GetExpires() (ret CreateAccessKeyResponseGetExpiresRetType) {
 	ret, _ = o.GetExpiresOk()
 	return ret
@@ -232,6 +237,7 @@ func (o *CreateAccessKeyResponse) GetExpires() (ret CreateAccessKeyResponseGetEx
 
 // GetExpiresOk returns a tuple with the Expires field value
 // and a boolean to check if the value has been set.
+// NOTE: If the value is an explicit nil, `nil, true` will be returned
 func (o *CreateAccessKeyResponse) GetExpiresOk() (ret CreateAccessKeyResponseGetExpiresRetType, ok bool) {
 	return getCreateAccessKeyResponseGetExpiresAttributeTypeOk(o.Expires)
 }