diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2582aec1..a280a0c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 All notes should be prepended with the location of the change, e.g. `(proto)` or `(resolver)`.
 
+## 0.21.0 (unreleased)
+
+### Changed
+
+- (all) Most public enum types are now marked `#[non_exaustive]` #1426
+- (resolver) DnsRequestOptions and ResolverOpts now `#[non_exaustive]` #1426
+
 ## 0.20.1
 
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index cc8f712a..f690cc9a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,7 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
-
 [[package]]
 name = "addr2line"
 version = "0.14.1"