diff --git a/pyproject.toml b/pyproject.toml
index d71cbe3c..c5192462 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 speed = [
     "ciso8601==2.3.3",
-    "orjson==3.11.4",
+    "orjson==3.11.5",
 ]
 test = [
     "black==25.9.0",
diff --git a/requirements-speed.txt b/requirements-speed.txt
index fcd4a46c..ed91d394 100644
--- a/requirements-speed.txt
+++ b/requirements-speed.txt
@@ -1,2 +1,2 @@
 ciso8601==2.3.3
-orjson==3.11.4
+orjson==3.11.5