diff --git a/CHANGELOG.md b/CHANGELOG.md
index 382dec59..d742d037 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,12 +2,17 @@
 
 ## [next] - 2022-MM-DD
 
+## [v0.0.21] - 2022-10-23
+
+### Added
+
+- **flat-rs**: New errors for debugging flat decoding issues
+
 ### Changed
 
 - **uplc**: Fixed overflow issue by changing `i64` to `i128` in `BigInt::Int` instances
 - **uplc**: Added `apply_params_to_script` function (applies params to script and serializes the new script).
 
-
 ## [v0.0.20] - 2022-10-17
 
 ### Added