diff --git a/CHANGES.md b/CHANGES.md
index d59280643f2d020d2af9dacd0ca399f11b8494cb..bd4365f9895a35ff5b232c9aef451c9bae4f0aeb 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,6 @@
 # Changes
 
-## 2020/MM/DD
+## 2020/10/12
 
 * In principle, when the parameter `check_iterator_validity` is `true`, a
   concurrent modification (that is, a modification of an ephemeral sequence