diff --git a/pyproject.toml b/pyproject.toml
index 0289639a..b4a47604 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ Repository = "https://github.com/anthropics/anthropic-sdk-python"
 managed = true
 dev-dependencies = [
     "pyright==1.1.332",
-    "mypy==1.4.1",
+    "mypy==1.6.1",
     "black==23.3.0",
     "respx==0.19.2",
     "pytest==7.1.1",
diff --git a/requirements-dev.lock b/requirements-dev.lock
index 8b23cf12..6560d3c8 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -28,7 +28,7 @@ huggingface-hub==0.16.4
 idna==3.4
 iniconfig==2.0.0
 isort==5.10.1
-mypy==1.4.1
+mypy==1.6.1
 mypy-extensions==1.0.0
 nodeenv==1.8.0
 nox==2023.4.22