diff --git a/stabilityai/__init__.py b/stabilityai/__init__.py
index 976498a..77a855a 100644
--- a/stabilityai/__init__.py
+++ b/stabilityai/__init__.py
@@ -1 +1,3 @@
-__version__ = "1.0.3"
+from pkg_resources import parse_version
+
+__version__ = parse_version("1.0.4")
diff --git a/stabilityai/client.py b/stabilityai/client.py
index f0f8cfe..2ec5de5 100644
--- a/stabilityai/client.py
+++ b/stabilityai/client.py
@@ -48,6 +48,7 @@ from stabilityai.models import (
     UpscaleImageHeight,
     UpscaleImageWidth,
 )
+from stabilityai.utils import serialize_for_form
 
 
 class AsyncStabilityClient:
@@ -150,7 +151,7 @@ class AsyncStabilityClient:
                 )
             )
 
-        assert text_prompts is not None
+        text_prompts = text_prompts or [TextPrompt(text=text_prompt)]
         return text_prompts
 
     @validate_arguments
@@ -227,9 +228,9 @@ class AsyncStabilityClient:
     @validate_arguments(config={"arbitrary_types_allowed": True})
     async def image_to_image(
         self,
-        text_prompts: TextPrompts,
-        text_prompt: SingleTextPrompt,
         init_image: InitImage,
+        text_prompts: Optional[TextPrompts] = None,
+        text_prompt: Optional[SingleTextPrompt] = None,
         *,
         init_image_mode: Optional[InitImageMode] = None,
         image_strength: InitImageStrength,
@@ -263,12 +264,16 @@ class AsyncStabilityClient:
             extras=extras,
         )
 
+        form = aiohttp.FormData()
+        form_data = serialize_for_form(request_body.dict())
+
+        for k, v in form_data.items():
+            form.add_field(k, v)
+
         try:
             res = await self.session.post(
-                f"/v1/generation/{engine_id}/text-to-image",
-                data=request_body.json(
-                    exclude_none=True, exclude_defaults=True, exclude_unset=True
-                ),
+                f"/v1/generation/{engine_id}/image-to-image",
+                data=form,
             )
         except ClientResponseError as e:
             raise figure_out_exception(e) from e
diff --git a/stabilityai/exceptions.py b/stabilityai/exceptions.py
index 9c99bb3..1e0a3b2 100644
--- a/stabilityai/exceptions.py
+++ b/stabilityai/exceptions.py
@@ -1,4 +1,5 @@
 import textwrap
+
 from aiohttp.client_exceptions import ClientResponseError
 
 
diff --git a/stabilityai/utils.py b/stabilityai/utils.py
new file mode 100644
index 0000000..7d9a114
--- /dev/null
+++ b/stabilityai/utils.py
@@ -0,0 +1,38 @@
+from numbers import Number
+from typing import Mapping, Sequence
+
+
+def serialize_for_form(data, path="", res={}):
+    print(data, path, res)
+    if isinstance(data, Mapping):
+        for key, val in data.items():
+            if val is not None:
+                xxx = f"{path}[{key}]" if path else key
+                serialize_for_form(val, xxx, res)
+    elif isinstance(data, Sequence) and not isinstance(data, str):
+        for i, elem in enumerate(data):
+            serialize_for_form(elem, f"{path}[{i}]", res)
+    elif isinstance(data, Number):
+        res[path] = str(data)
+    else:
+        res[path] = data
+
+    return res
+
+
+if __name__ == "__main__":
+    dat = {
+        "text_prompts": [{"text": "Birthday party at a gothic church", "weight": None}],
+        "init_image": None,
+        "init_image_mode": None,
+        "image_strength": 0.3,
+        "step_schedule_start": None,
+        "step_schedule_end": None,
+        "cfg_scale": None,
+        "clip_guidance_preset": None,
+        "sampler": None,
+        "sample_extras": None,
+    }
+    s = serialize_for_form(dat)
+
+    print(s)