diff --git a/README.md b/README.md
index 4fb72d8..0b1f861 100644
--- a/README.md
+++ b/README.md
@@ -106,13 +106,13 @@ class Derived(Base):
     def foo(self) -> int:
         return 2
 
-def bar(x: [Base]) -> int:
+def bar(x: list[Base]) -> int:
     sum = 0
     for v in x:
         sum += v.foo()
     return sum
 
-# incorrect, the type signature of the list is `[virtual[Base]]`
+# incorrect, the type signature of the list is `list[virtual[Base]]`
 bar([Base(), Derived()])
 ```
 
@@ -124,7 +124,7 @@ inlining etc.
 
 Example:
 ```py
-def bar2(x: [virtual[Base]]) -> int:
+def bar2(x: list[virtual[Base]]) -> int:
     sum = 0
     for v in x:
         sum += v.foo()