diff --git a/mypy.ini b/mypy.ini
index 01e108d..0ad51e4 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -12,16 +12,12 @@ disallow_incomplete_defs = True
 check_untyped_defs = True
 disallow_untyped_decorators = True
 
-implicit_optional = False
-strict_optional = True
-
 warn_redundant_casts = True
 warn_unused_ignores = True
 warn_no_return = True
 warn_return_any = True
 warn_unreachable = True
 
-strict_concatenate = True
 strict_equality = True
 strict = True