diff --git a/pyproject.toml b/pyproject.toml
index 845fbbd005..0add1189cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "basedpyright>=1.39.8",
+    "basedpyright>=1.39.9",
     "pytest",
     "pytest-mock",
     "ruff",
diff --git a/uv.lock b/uv.lock
index 54414bdd9a..0cf025a2fe 100644
--- a/uv.lock
+++ b/uv.lock
@@ -143,14 +143,14 @@ wheels = [
 
 [[package]]
 name = "basedpyright"
-version = "1.39.8"
+version = "1.39.9"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "nodejs-wheel-binaries" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d2/62/8550c75850b2185df984d1de437b4805b039ba856cacbee2966236203133/basedpyright-1.39.8.tar.gz", hash = "sha256:bb1a86d4d71425d52d1501b317fe23d45527baed06bd5d5e1a07cd4b60d07b55", size = 25488230, upload-time = "2026-06-14T09:05:30.177Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7a/4b/c1f4e211e50389304d6af32b9280e026a7133e3ad59bbdf8f7a3250f8bee/basedpyright-1.39.9.tar.gz", hash = "sha256:32cbea5fc8273e89df3db20daea56cb7286e419ccdfdc479c64759d2dc071901", size = 24412216, upload-time = "2026-06-27T02:19:49.834Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f5/94/878454aefe94328ba7ad808ecd63da8311aae1198da46cfb29f5cfe130a8/basedpyright-1.39.8-py3-none-any.whl", hash = "sha256:a79d89928064bd9023d429b50c625d87d023bacc2fe3932ef6c7bd13b5426048", size = 13182726, upload-time = "2026-06-14T09:05:26.368Z" },
+    { url = "https://files.pythonhosted.org/packages/2a/d4/e1fa108710d0498a18c77b1e13897f31eab47c69aa8cfe2d2a4df746541e/basedpyright-1.39.9-py3-none-any.whl", hash = "sha256:6b0837b9eba972c71895167ab9b127e6afdbc17abc92312e3f8d15ca82a5611c", size = 13374276, upload-time = "2026-06-27T02:19:54.431Z" },
 ]
 
 [[package]]
@@ -1218,7 +1218,7 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "basedpyright", specifier = ">=1.39.8" },
+    { name = "basedpyright", specifier = ">=1.39.9" },
     { name = "pytest" },
     { name = "pytest-mock" },
     { name = "ruff" },