diff --git a/pyproject.toml b/pyproject.toml
index 370836ec..571add58 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,6 +78,7 @@ disallow_untyped_decorators = true
 disallow_untyped_defs = true
 extra_checks = true
 strict = false
+strict_bytes = true
 strict_equality = true
 warn_redundant_casts = true
 warn_return_any = true