diff --git a/services/iaas/client.go b/services/iaas/client.go
index 6491278db..3311006ab 100644
--- a/services/iaas/client.go
+++ b/services/iaas/client.go
@@ -501,10 +501,7 @@ 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/iaas/go.mod b/services/iaas/go.mod
index 4b9b684c0..c632d4baf 100644
--- a/services/iaas/go.mod
+++ b/services/iaas/go.mod
@@ -4,7 +4,7 @@ go 1.21
 
 require (
 	github.com/google/go-cmp v0.7.0
-	github.com/stackitcloud/stackit-sdk-go/core v0.20.1
+	github.com/stackitcloud/stackit-sdk-go/core v0.21.0
 	github.com/stackitcloud/stackit-sdk-go/services/resourcemanager v0.18.2
 )
 
diff --git a/services/iaas/go.sum b/services/iaas/go.sum
index 15ab42c5b..1debadd4c 100644
--- a/services/iaas/go.sum
+++ b/services/iaas/go.sum
@@ -4,7 +4,7 @@ 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=
 github.com/stackitcloud/stackit-sdk-go/services/resourcemanager v0.18.2 h1:VDIXOvRNmSYMeF0qQ2+w4/ez04YutVDz73hSMuuOJ54=
 github.com/stackitcloud/stackit-sdk-go/services/resourcemanager v0.18.2/go.mod h1:9zyEzPL4DnmU/SHq+SuMWTSO5BPxM1Z4g8Fp28n00ds=