diff --git a/dev-requirements.txt b/dev-requirements.txt
index 95175f8a..be8de496 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -2,6 +2,8 @@
 #    uv pip compile --extra dev pyproject.toml --output-file dev-requirements.txt
 alabaster==1.0.0
     # via sphinx
+annotated-doc==0.0.4
+    # via fastapi
 annotated-types==0.7.0
     # via pydantic
 anyio==4.9.0
@@ -45,12 +47,6 @@ click==8.2.1
     #   uvicorn
 codespell==2.4.1
     # via labthings-fastapi (pyproject.toml)
-colorama==0.4.6
-    # via
-    #   click
-    #   pytest
-    #   sphinx
-    #   uvicorn
 coverage==7.9.2
     # via pytest-cov
 cssutils==2.11.1
@@ -83,7 +79,7 @@ exceptiongroup==1.3.0
     # via
     #   anyio
     #   pytest
-fastapi==0.116.1
+fastapi==0.135.1
     # via labthings-fastapi (pyproject.toml)
 fastapi-cli==0.0.8
     # via fastapi
@@ -169,8 +165,6 @@ natsort==8.4.0
     # via domdf-python-tools
 numpy==2.2.6
     # via labthings-fastapi (pyproject.toml)
-orjson==3.11.0
-    # via fastapi
 packaging==25.0
     # via
     #   pytest
@@ -187,14 +181,14 @@ pluggy==1.6.0
     #   pytest-cov
 pycodestyle==2.14.0
     # via flake8
-pydantic==2.10.6
+pydantic==2.12.5
     # via
     #   labthings-fastapi (pyproject.toml)
     #   fastapi
     #   fastapi-cloud-cli
     #   pydantic-extra-types
     #   pydantic-settings
-pydantic-core==2.27.2
+pydantic-core==2.41.5
     # via pydantic
 pydantic-extra-types==2.10.5
     # via fastapi
@@ -355,10 +349,11 @@ typing-extensions==4.14.1
     #   typer
     #   typing-inspection
     #   uvicorn
-typing-inspection==0.4.1
-    # via pydantic-settings
-ujson==5.10.0
-    # via fastapi
+typing-inspection==0.4.2
+    # via
+    #   fastapi
+    #   pydantic
+    #   pydantic-settings
 urllib3==2.5.0
     # via
     #   requests
@@ -369,6 +364,8 @@ uvicorn==0.35.0
     #   fastapi
     #   fastapi-cli
     #   fastapi-cloud-cli
+uvloop==0.22.1
+    # via uvicorn
 watchfiles==1.1.0
     # via uvicorn
 webencodings==0.5.1
diff --git a/pyproject.toml b/pyproject.toml
index ecd49c92..51eab323 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,13 +13,13 @@ classifiers = [
   "Operating System :: OS Independent",
 ]
 dependencies = [
-  "pydantic ~= 2.10.6",
+  "pydantic ~= 2.12",
   "numpy>=1.20",
   "jsonschema",
   "typing_extensions",
   "anyio ~=4.0",
   "httpx",
-  "fastapi[all]>=0.115.0",
+  "fastapi[all]~=0.135.0",
   "zeroconf >=0.28.0",
 ]
 
diff --git a/src/labthings_fastapi/outputs/blob.py b/src/labthings_fastapi/outputs/blob.py
index 03dc570a..9df4cd92 100644
--- a/src/labthings_fastapi/outputs/blob.py
+++ b/src/labthings_fastapi/outputs/blob.py
@@ -614,7 +614,7 @@ def __get_pydantic_core_schema__(
         """
         return core_schema.no_info_wrap_validator_function(
             cls._validate,
-            BlobModel.__get_pydantic_core_schema__(BlobModel, handler),
+            BlobModel.__pydantic_core_schema__,
             serialization=core_schema.wrap_serializer_function_ser_schema(
                 cls._serialize,
                 is_field_serializer=False,
diff --git a/src/labthings_fastapi/utilities/__init__.py b/src/labthings_fastapi/utilities/__init__.py
index 13173b4b..f26fddc5 100644
--- a/src/labthings_fastapi/utilities/__init__.py
+++ b/src/labthings_fastapi/utilities/__init__.py
@@ -6,7 +6,6 @@
 from weakref import WeakSet
 from pydantic import BaseModel, ConfigDict, Field, RootModel, create_model
 from pydantic.dataclasses import dataclass
-from pydantic_core import SchemaError
 
 from labthings_fastapi.exceptions import UnsupportedConstraintError
 from .introspection import EmptyObject
@@ -129,7 +128,7 @@ def wrap_plain_types_in_rootmodel(
     :raises UnsupportedConstraintError: if constraints are provided for an
         unsuitable type, for example `allow_inf_nan` for an `int` property, or
         any constraints for a `BaseModel` subclass.
-    :raises SchemaError: if other errors prevent Pydantic from creating a schema
+    :raises RuntimeError: if other errors prevent Pydantic from creating a schema
         for the generated model.
     """
     try:  # This needs to be a `try` as basic types are not classes
@@ -148,13 +147,9 @@ def wrap_plain_types_in_rootmodel(
             root=(model, Field(**constraints)),
             __base__=LabThingsRootModelWrapper,
         )
-    except SchemaError as e:
-        for error in e.errors():
-            if error["loc"][-1] in constraints:
-                key = error["loc"][-1]
-                raise UnsupportedConstraintError(
-                    f"Constraint {key} is not supported for type {model!r}."
-                ) from e
+    except RuntimeError as e:
+        if "Unable to apply constraint" in str(e):
+            raise UnsupportedConstraintError(str(e)) from e
         raise e
 
 
diff --git a/tests/test_properties.py b/tests/test_properties.py
index f7182440..2d4fd9e9 100644
--- a/tests/test_properties.py
+++ b/tests/test_properties.py
@@ -438,7 +438,7 @@ def test_bad_property_constraints():
     """Test that bad constraints raise errors at definition time."""
 
     class BadConstraintThing(lt.Thing):
-        bad_prop: int = lt.property(default=0, allow_inf_nan=False)
+        bad_prop: str = lt.property(default="hello", allow_inf_nan=True)
 
     # Some constraints cause errors when the model is built. So far
     # I believe only allow_inf_nan on int does this.