diff --git a/pyproject.toml b/pyproject.toml
index bd0e1b0..0853d19 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,13 +24,13 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 all = [
-    "ujson==5.10.0",
+    "ujson==5.11.0",
     "python-dateutil==2.9.0.post0",
     "types-python-dateutil==2.9.0.20251008",
     "psutil==7.1.0",
 ]
 checksum = [
-    "ujson==5.10.0",
+    "ujson==5.11.0",
 ]
 dateutil = [
     "python-dateutil==2.9.0.post0",