diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3730c99..8220282 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 ### Removed
 
+## [4.1.0-rc1] - 2019-11-25
+### Added
+- Add functionality to check if bytecode from the chain was compiled from given
+  source code. In `aesophia_cli`:
+  ```
+    aesophia_cli --validate cb_... MyContract.aes
+  ```
+  In `aesophia_http`: `validate-byte-code` entrypoint.
+- Support encoding and decoding bit fields in call arguments and results.
+### Changed
+- Fix bug with standard library includes in `aesophia_cli`.
+- Various improvements to FATE code generator.
+### Removed
+
 ## [4.0.0] - 2019-10-11
 ### Added
 - `Address.to_contract` - casts an address to a (any) contract type.