diff --git a/pyproject.toml b/pyproject.toml
index 3a4b0257..5908e3f7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 speed = [
     "ciso8601==2.3.3",
-    "orjson==3.11.7",
+    "orjson==3.12.0",
 ]
 test = [
     "black==25.9.0",
diff --git a/requirements-speed.txt b/requirements-speed.txt
index bf3cf6b5..6eed0eb0 100644
--- a/requirements-speed.txt
+++ b/requirements-speed.txt
@@ -1,2 +1,2 @@
 ciso8601==2.3.3
-orjson==3.11.7
+orjson==3.12.0