diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2840700b..398768b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,14 @@
 
 ## [next] - 2022-MM-DD
 
+---
+
+## [v0.0.20] - 2022-10-17
+
 ### Added
 
 - **aiken**: `Project` module which is responsible loading modules and running the compilation steps
 - **aiken**: `UplcCommand::Flat` flip the cbor_hex if condition so that the correct logic runs when using the flag
+- **uplc**: use i128 for `Constant::Integer`
+- **flat-rs**: add support for i128 encode and decode
+- **flat-rs**: add i128 zigzag function