diff --git a/pyproject.toml b/pyproject.toml
index 0d54d05..bf9bec4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,6 +39,8 @@ dependencies = [
     # AttributeError on pydantic 1 — v2 is a real requirement of ours, not a preference.
     # 2.0.2, not 2.0: the fastapi extra excludes 2.0.0 and 2.0.1.
     "pydantic>=2.0.2",
+    # Imported directly (typing_extensions.override, for 3.11); 4.12.0 is faststream 0.7.6's own floor.
+    "typing-extensions>=4.12.0",
 ]
 
 [project.optional-dependencies]