diff --git a/requirements.dev.txt b/requirements.dev.txt
index abce08e..c3af712 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -4,11 +4,11 @@ beautifulsoup4
 black
 boto3
 boto3-stubs[lambda,s3]
-fastapi
+fastapi<0.89.0
 mangum
 orjson
 passlib
-pydantic
+pydantic<2
 python-multipart
 requests
 uvicorn
diff --git a/setup.py b/setup.py
index 47fd4e4..fa73861 100644
--- a/setup.py
+++ b/setup.py
@@ -44,11 +44,11 @@
     "aws-error-utils",
     "backoff",
     "beautifulsoup4",
-    "fastapi",
+    "fastapi<0.89.0",
     "mangum",
     "orjson",
     "passlib",
-    "pydantic",
+    "pydantic<2",
     "python-multipart",
     "requests",
 ]
diff --git a/src/lambda_function/function.py b/src/lambda_function/function.py
index e24228b..7c47d55 100644
--- a/src/lambda_function/function.py
+++ b/src/lambda_function/function.py
@@ -139,7 +139,7 @@ class PyPIMeta(BaseModel, json_dumps=orjson_dumps, json_loads=orjson.loads):
 
     @validator("api_version")
     def api_version_validator(cls, value: str) -> str:
-        if value != "1.0":
+        if not re.match(r"1\.[0-9]+", value):
             raise ValueError(f"Received an unknown 'api-version': {value}")
         return value