diff --git a/CHANGELOG.md b/CHANGELOG.md
index f27a4a7..7b4b022 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,51 +9,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 ### Removed
 
+## [4.1.0-rc1] - 2019-11-25
+### Added
+- Support encoding and decoding bit fields in call arguments and results.
+### Changed
+- 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.
 - Pragma to check compiler version, e.g. `@compiler >= 4.0`.
-### Changed
-- Nice type error if contract function is called as from a namespace.
-- Fail on function definitions in contracts other than the main contract.
-- Bug fix in variable optimization - don't discard writes to the store/state.
-### Removed
-
-## [4.0.0-rc5] - 2019-09-27
-### Added
-### Changed
-- Bug fixes in error reporting.
-- Bug fix in variable liveness analysis for FATE.
-### Removed
-
-## [4.0.0-rc4] - 2019-09-13
-### Added
 - Handle numeric escapes, i.e. `"\x19Ethereum Signed Message:\n"`, and similar strings.
-### Changed
-### Removed
-
-## [4.0.0-rc3] - 2019-09-12
-### Added
 - `Bytes.concat` and `Bytes.split` are added to be able to
   (de-)construct byte arrays.
 - `[a..b]` language construct, returning the list of numbers between
   `a` and `b` (inclusive). Returns the empty list if `a` > `b`.
 - [Standard libraries] (https://github.com/aeternity/protocol/blob/master/contracts/sophia_stdlib.md)
 - Checks that `init` is not called from other functions.
-### Changed
-- Error messages are changed into a uniform format, and more helpful
-  messages have been added.
-- `Crypto.<hash_fun>` and `String.<hash_fun>` for byte arrays now only
-  hash the actual byte array - not the internal ABI format.
-- More strict checks for polymorphic oracles and higher order oracles
-  and entrypoints.
-- `AENS.claim` is updated with a `NameFee` field - to be able to do
-  name auctions within contracts.
-- Fixed a bug in `Bytes.to_str` for AEVM.
-### Removed
-
-## [4.0.0-rc1] - 2019-08-22
-### Added
 - FATE backend - the compiler is able to produce VM code for both `AEVM` and `FATE`. Many
   of the APIs now take `{backend, aevm | fate}` to decide wich backend to produce artifacts
   for.
@@ -70,6 +43,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   that shall be able to receive funds should be marked as payable. `Address.is_payable(a)`
   can be used to check if an (contract) address is payable or not.
 ### Changed
+- Nice type error if contract function is called as from a namespace.
+- Fail on function definitions in contracts other than the main contract.
+- Bug fix in variable optimization - don't discard writes to the store/state.
+- Bug fixes in error reporting.
+- Bug fix in variable liveness analysis for FATE.
+- Error messages are changed into a uniform format, and more helpful
+  messages have been added.
+- `Crypto.<hash_fun>` and `String.<hash_fun>` for byte arrays now only
+  hash the actual byte array - not the internal ABI format.
+- More strict checks for polymorphic oracles and higher order oracles
+  and entrypoints.
+- `AENS.claim` is updated with a `NameFee` field - to be able to do
+  name auctions within contracts.
+- Fixed a bug in `Bytes.to_str` for AEVM.
 - New syntax for tuple types. Now 0-tuple type is encoded as `unit` instead of `()` and
   regular tuples are encoded by interspersing inner types with `*`, for instance `int * string`.
   Parens are not necessary. Note it only affects the types, values remain as their were before,
diff --git a/rebar.config b/rebar.config
index e5ca552..194fe6f 100644
--- a/rebar.config
+++ b/rebar.config
@@ -15,7 +15,7 @@
             {base_plt_apps, [erts, kernel, stdlib, crypto, mnesia]}
            ]}.
 
-{relx, [{release, {aesophia, "4.0.0"},
+{relx, [{release, {aesophia, "4.1.0-rc1"},
          [aesophia, aebytecode, getopt]},
 
         {dev_mode, true},
diff --git a/src/aesophia.app.src b/src/aesophia.app.src
index d22866c..7efc2aa 100644
--- a/src/aesophia.app.src
+++ b/src/aesophia.app.src
@@ -1,6 +1,6 @@
 {application, aesophia,
  [{description, "Contract Language for aeternity"},
-  {vsn, "4.0.0"},
+  {vsn, "4.1.0-rc1"},
   {registered, []},
   {applications,
    [kernel,