diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..d4c7e37
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,10 @@
+[flake8]
+# https://lintlyci.github.io/Flake8Rules/
+# E231 missing whitespace after ','
+# E266 Too many leading '#' for block comment
+# E501 Line too long (82 > 79 characters)
+# W503 Line break occurred before a binary operator <- This one is flipping to the reverse as best-practice, which is how Black currently formats
+# W605 Invalid escape sequence 'x'
+ignore = E203, E231, E266, E501, W503, W605, E704
+max-line-length = 100
+exclude = .git, .venv, __pycache__, docs, gitlab-ci-includes
diff --git a/requirements.txt b/requirements.txt
index 673d161..a66ee29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
-aiohttp==3.8.4
-pydantic==1.10.2
+aiohttp>=3.8.4
+pydantic>=2.11.5
+pydantic-core>=2.33.2
diff --git a/rtex/__init__.py b/rtex/__init__.py
index 27fdca4..034f46c 100644
--- a/rtex/__init__.py
+++ b/rtex/__init__.py
@@ -1 +1 @@
-__version__ = "0.0.3"
+__version__ = "0.0.6"
diff --git a/rtex/client.py b/rtex/client.py
index 85cae41..769f2a2 100644
--- a/rtex/client.py
+++ b/rtex/client.py
@@ -5,7 +5,7 @@ import textwrap
 from typing import Optional
 
 import aiohttp
-from pydantic import validate_arguments
+from pydantic import validate_call
 
 from rtex.constants import DEFAULT_API_HOST, FORMAT_MIME
 from rtex.exceptions import RtexError, YouNeedToUseAContextManager
@@ -73,7 +73,7 @@ class AsyncRtexClient:
                 )
             )
 
-    @validate_arguments
+    @validate_call
     async def create_render(
         self,
         code: str,
@@ -99,16 +99,16 @@ class AsyncRtexClient:
         res = await self.session.post(
             "/api/v2",
             headers={"Accept": "application/json"},
-            data=request_body.json(
+            data=request_body.model_dump_json(
                 exclude_defaults=True,
                 exclude_none=True,
                 exclude_unset=True,
             ),
         )
 
-        return CreateLaTeXDocumentResponse.parse_obj(await res.json()).__root__
+        return CreateLaTeXDocumentResponse.model_validate(await res.json()).root
 
-    @validate_arguments(config={"arbitrary_types_allowed": True})
+    @validate_call(config={"arbitrary_types_allowed": True})
     async def save_render(
         self,
         filename: str,
@@ -127,7 +127,7 @@ class AsyncRtexClient:
         async for chunk, _ in res.content.iter_chunks():
             output_fd.write(chunk)
 
-    @validate_arguments
+    @validate_call
     async def get_render(
         self,
         filename: str,
@@ -139,7 +139,7 @@ class AsyncRtexClient:
 
         return buf
 
-    @validate_arguments
+    @validate_call
     async def render_math(
         self,
         code: str,
diff --git a/rtex/models.py b/rtex/models.py
index a3f91d8..06b61e8 100644
--- a/rtex/models.py
+++ b/rtex/models.py
@@ -1,6 +1,6 @@
 from typing import Annotated, Literal, Optional, Union
 
-from pydantic import BaseModel, Field, conint
+from pydantic import BaseModel, Field, RootModel, conint
 
 RenderFormat = Literal["png", "jpg", "pdf"]
 RenderQuality = Annotated[int, conint(gt=0, le=100)]
@@ -26,8 +26,8 @@ class CreateLaTeXDocumentErrorResponse(BaseModel):
     description: str
 
 
-class CreateLaTeXDocumentResponse(BaseModel):
-    __root__: Union[
+class CreateLaTeXDocumentResponse(RootModel):
+    root: Union[
         CreateLaTeXDocumentSuccessResponse,
         CreateLaTeXDocumentErrorResponse,
     ] = Field(discriminator="status")