diff --git a/services/serverupdate/client.go b/services/serverupdate/client.go
index 4d6b82f7d..53e2bd93f 100644
--- a/services/serverupdate/client.go
+++ b/services/serverupdate/client.go
@@ -498,10 +498,7 @@ func addFile(w *multipart.Writer, fieldName, path string) error {
 	if err != nil {
 		return err
 	}
-	err = file.Close()
-	if err != nil {
-		return err
-	}
+	defer file.Close()
 
 	part, err := w.CreateFormFile(fieldName, filepath.Base(path))
 	if err != nil {
diff --git a/services/serverupdate/go.mod b/services/serverupdate/go.mod
index 80fefb599..627d84076 100644
--- a/services/serverupdate/go.mod
+++ b/services/serverupdate/go.mod
@@ -2,7 +2,7 @@ module github.com/stackitcloud/stackit-sdk-go/services/serverupdate
 
 go 1.21
 
-require github.com/stackitcloud/stackit-sdk-go/core v0.20.1
+require github.com/stackitcloud/stackit-sdk-go/core v0.21.0
 
 require (
 	github.com/golang-jwt/jwt/v5 v5.3.0 // indirect
diff --git a/services/serverupdate/go.sum b/services/serverupdate/go.sum
index 6eca79590..9be45a73d 100644
--- a/services/serverupdate/go.sum
+++ b/services/serverupdate/go.sum
@@ -4,5 +4,5 @@ github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/stackitcloud/stackit-sdk-go/core v0.20.1 h1:odiuhhRXmxvEvnVTeZSN9u98edvw2Cd3DcnkepncP3M=
-github.com/stackitcloud/stackit-sdk-go/core v0.20.1/go.mod h1:fqto7M82ynGhEnpZU6VkQKYWYoFG5goC076JWXTUPRQ=
+github.com/stackitcloud/stackit-sdk-go/core v0.21.0 h1:QXZqiaO7U/4IpTkJfzt4dt6QxJzG2uUS12mBnHpYNik=
+github.com/stackitcloud/stackit-sdk-go/core v0.21.0/go.mod h1:fqto7M82ynGhEnpZU6VkQKYWYoFG5goC076JWXTUPRQ=