diff --git a/pkgs/collection/CHANGELOG.md b/pkgs/collection/CHANGELOG.md
index b6a9c82b..2891b0dc 100644
--- a/pkgs/collection/CHANGELOG.md
+++ b/pkgs/collection/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.19.1-wip
+## 1.20.0-wip
 
 - Add `IterableMapEntryExtension` for working on `Map` as a list of pairs, using
   `Map.entries`.
diff --git a/pkgs/collection/pubspec.yaml b/pkgs/collection/pubspec.yaml
index d8f65901..a1a3a0b1 100644
--- a/pkgs/collection/pubspec.yaml
+++ b/pkgs/collection/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.19.1-wip
+version: 1.20.0-wip
 description: >-
   Collections and utilities functions and classes related to collections.
 repository: https://github.com/dart-lang/core/tree/main/pkgs/collection