diff --git a/pyproject.toml b/pyproject.toml
index 7ddffed..72ecf9a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,13 +39,13 @@ Changelog = "https://github.com/googleapis/langchain-google-spanner-python/blob/
 
 [project.optional-dependencies]
 lint = [
-    "black[jupyter]==24.10.0",
+    "black[jupyter]==26.3.1",
     "flake8==6.1.0",
     "isort==5.13.2",
 ]
 
 test = [
-    "black[jupyter]==24.10.0",
+    "black[jupyter]==26.3.1",
     "bs4==0.0.2",
     "flake8==6.1.0",
     "isort==5.13.2",