Go back to previous unpublished version (#211)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00e27a2..68333cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,4 @@
-## 1.16.1-dev
-
-## 1.16.0
+## 1.16.0-dev
 
 * Use a stable sort algorithm in the `IterableExtension.sortedBy` method.
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 47c395d..ea2a2c0 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.16.1-dev
+version: 1.16.0-dev
 
 description: Collections and utilities functions and classes related to collections.
 repository: https://github.com/dart-lang/collection
@@ -9,4 +9,4 @@
 
 dev_dependencies:
   lints: ^1.0.0
-  test: ^1.16.0-nullsafety
+  test: ^1.16.0