diff --git a/stabilityai/__init__.py b/stabilityai/__init__.py
index 7863915..976498a 100644
--- a/stabilityai/__init__.py
+++ b/stabilityai/__init__.py
@@ -1 +1 @@
-__version__ = "1.0.2"
+__version__ = "1.0.3"
diff --git a/stabilityai/models.py b/stabilityai/models.py
index 13fa308..a3c9ab4 100644
--- a/stabilityai/models.py
+++ b/stabilityai/models.py
@@ -187,8 +187,8 @@ class TextToImageRequestBody(GenerationRequestOptionalParams):
 
 class ImageToImageUpscaleRequestBody(BaseModel):
     image: InitImage
-    width: Optional[UpscaleImageWidth]
-    height: Optional[UpscaleImageHeight]
+    width: Optional[UpscaleImageWidth] = None
+    height: Optional[UpscaleImageHeight] = None
 
     @validator("width", always=True)
     def mutually_exclusive(cls, v, values):