diff --git a/readalongs/web_api.py b/readalongs/web_api.py
index 2bb1033b..d70d0387 100644
--- a/readalongs/web_api.py
+++ b/readalongs/web_api.py
@@ -92,8 +92,8 @@ class InputFormat(Enum):
 class AssembleRequest(BaseModel):
     """Base request for assemble"""
 
-    input_text: str = Field(None, alias="input")
-    mime_type: InputFormat = Field(None, alias="type")
+    input_text: Optional[str] = Field(None, alias="input")
+    mime_type: Optional[InputFormat] = Field(None, alias="type")
     text_languages: List[str]
     debug: bool = False
 
@@ -105,10 +105,10 @@ class AssembleResponse(BaseModel):
     text_ids: str  # The text ID input for the decoder in plain text
     processed_ras: str  # The processed RAS XML is returned as a string
     input_request: Optional[AssembleRequest] = Field(None, alias="input")
-    parsed: Optional[str]
-    tokenized: Optional[str]
-    g2ped: Optional[str]
-    log: Optional[str]
+    parsed: Optional[str] = None
+    tokenized: Optional[str] = None
+    g2ped: Optional[str] = None
+    log: Optional[str] = None
 
 
 class SupportedLanguage(BaseModel):
@@ -144,26 +144,28 @@ async def langs() -> List[SupportedLanguage]:
 @v1.post("/assemble", response_model=AssembleResponse)
 async def assemble(
     request: AssembleRequest = Body(
-        examples={
-            "text": {
-                "summary": "A basic example with plain text input",
-                "value": {
-                    "input": "hej verden",
-                    "type": "text/plain",
-                    "text_languages": ["dan", "und"],
-                    "debug": False,
+        examples=[
+            {
+                "text": {
+                    "summary": "A basic example with plain text input",
+                    "value": {
+                        "input": "hej verden",
+                        "type": "text/plain",
+                        "text_languages": ["dan", "und"],
+                        "debug": False,
+                    },
                 },
-            },
-            "xml": {
-                "summary": "A basic example with xml input",
-                "value": {
-                    "input": "<?xml version='1.0' encoding='utf-8'?><read-along version=\"1.0\"><text><p><s>hej verden</s></p></text></read-along>",
-                    "type": "application/readalong+xml",
-                    "text_languages": ["dan", "und"],
-                    "debug": False,
+                "xml": {
+                    "summary": "A basic example with xml input",
+                    "value": {
+                        "input": "<?xml version='1.0' encoding='utf-8'?><read-along version=\"1.0\"><text><p><s>hej verden</s></p></text></read-along>",
+                        "type": "application/readalong+xml",
+                        "text_languages": ["dan", "und"],
+                        "debug": False,
+                    },
                 },
-            },
-        }
+            }
+        ]
     )
 ):
     """Create an input RAS from the given text (as plain text or XML).
@@ -190,7 +192,7 @@ async def assemble(
         if request.mime_type == InputFormat.RAS:
             try:
                 parsed = etree.fromstring(
-                    bytes(request.input_text, encoding="utf-8"),
+                    bytes(request.input_text or "", encoding="utf-8"),
                     parser=etree.XMLParser(resolve_entities=False),
                 )
             except etree.ParseError as e:
@@ -271,7 +273,7 @@ def create_grammar(xml):
 class WordAlignment(BaseModel):
     """Word alignment extracted from RAS"""
 
-    word_id: str = Field(None, alias="id")
+    word_id: Optional[str] = Field(None, alias="id")
     start: float
     end: float
 
@@ -317,6 +319,7 @@ class ConvertRequest(BaseModel):
         example=2.01,
         gt=0.0,
         title="The duration of the audio used to create the alignment, in seconds.",
+        default=None,
     )
 
     ras: str = Field(
diff --git a/requirements.dev.txt b/requirements.dev.txt
index 668a6356..aed0c7c5 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -3,7 +3,8 @@ black~=22.0
 flake8>=4.0.1
 gitlint-core==0.17.0
 isort>=5.10.1
-mypy>=0.941
+mypy>=1.4.1
+mypy>=1.5.1; python_version >= "3.8"
 pre-commit>=2.6.0
 types-python-slugify>=5.0.3
 types-pyyaml>=6.0.5
diff --git a/requirements.min.txt b/requirements.min.txt
index 9274774a..09ecdfa6 100644
--- a/requirements.min.txt
+++ b/requirements.min.txt
@@ -3,10 +3,12 @@ anyio<4.0.0
 chevron==0.14.0
 click>=8.0.4
 coloredlogs==10.0
-fastapi==0.78.0
-g2p>=1.1.20230822, ==1.*
+fastapi>=0.78.0
+# Note: when we move g2p to >=2, we will need fastapi>=0.100.0 which requires httpx
+g2p>=1.1.20230822, <2.1
+httpx>=0.24.1
 lxml==4.9.1
-networkx>=2.5,<=2.8.4
+networkx>=2.6
 numpy>=1.16.4
 pydub==0.23.1
 pympi-ling>=1.69,<2.0
diff --git a/setup.cfg b/setup.cfg
index 8d4c021f..4c0e4885 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,6 +9,7 @@ ensure_newline_before_comments=True
 
 [mypy]
 ignore_missing_imports = True
+plugins = pydantic.mypy
 
 [flake8]
 ignore = E203, E266, E501, W503