diff --git a/CHANGELOG.md b/CHANGELOG.md
index 999c0ab7..678da17f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,5 @@
 ## 0.13.8
- * Widen dependency constraint on `package:protobuf`.
+ * Require `package:protobuf` ^3.1.0.
 
 ## 0.13.7
  * Widen dependency constraint on `package:http`.