diff --git a/poetry.lock b/poetry.lock
index 01cb942c..3391a8ac 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -851,14 +851,14 @@ typing-extensions = ">=4.6.0,<4.7.0 || >4.7.0"
 
 [[package]]
 name = "pyright"
-version = "1.1.318"
+version = "1.1.326"
 description = "Command line wrapper for pyright"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pyright-1.1.318-py3-none-any.whl", hash = "sha256:056c1b2e711c3526e32919de1684ae599d34b7ec27e94398858a43f56ac9ba9b"},
-    {file = "pyright-1.1.318.tar.gz", hash = "sha256:69dcf9c32d5be27d531750de627e76a7cadc741d333b547c09044278b508db7b"},
+    {file = "pyright-1.1.326-py3-none-any.whl", hash = "sha256:f3c5047465138558d3d106a9464cc097cf2c3611da6edcf5b535cc1fdebd45db"},
+    {file = "pyright-1.1.326.tar.gz", hash = "sha256:cecbe026b14034ba0750db605718a8c2605552387c5772dfaf7f3e632cb7212a"},
 ]
 
 [package.dependencies]
@@ -1445,4 +1445,4 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "0bff26949175c9e1b574115a70e16186a554b03445470c966295a1e05d36ff9a"
+content-hash = "0722cd8ed9fc26ddcfc0ce75abbccdac002ca6e25aff76da8f284188a15738c2"
diff --git a/pyproject.toml b/pyproject.toml
index 5bd78c4b..d3fce957 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ tokenizers = ">= 0.13.0"
 
 
 [tool.poetry.group.dev.dependencies]
-pyright = "1.1.318"
+pyright = "1.1.326"
 mypy = "1.4.1"
 black = "23.3.0"
 respx = "0.19.2"
diff --git a/src/anthropic/_models.py b/src/anthropic/_models.py
index 164987a7..296d36c0 100644
--- a/src/anthropic/_models.py
+++ b/src/anthropic/_models.py
@@ -215,7 +215,7 @@ def validate_type(*, type_: type[_T], value: object) -> _T:
     if inspect.isclass(type_) and issubclass(type_, pydantic.BaseModel):
         return cast(_T, parse_obj(type_, value))
 
-    return _validate_non_model_type(type_=type_, value=value)
+    return cast(_T, _validate_non_model_type(type_=type_, value=value))
 
 
 # our use of subclasssing here causes weirdness for type checkers,