diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa36854..b8f97d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,5 @@
 # Changelog
 
-## v1.0.0 (unreleased)
+## v1.0.0-rc1 (2017-12-11)
 
 - Initial public release.
diff --git a/version.go b/version.go
index 6343a85..938ff83 100644
--- a/version.go
+++ b/version.go
@@ -22,4 +22,4 @@ package metrics
 
 // Version is the current semantic version, exported for runtime compatibility
 // checks.
-const Version = "0.1.0"
+const Version = "1.0.0-rc1"