diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22bf99eb6..78740bd9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## [1.133.1] - 2024-01-21
+
+### API-Changes
+
+- Add `is_bot` to cffi and jsonrpc ([#5197](https://github.com/deltachat/deltachat-core-rust/pull/5197)).
+
+### Features / Changes
+
+- Add system message when provider does not allow unencrypted messages ([#5195](https://github.com/deltachat/deltachat-core-rust/pull/5195)).
+
+### Fixes
+
+- `Chat::send_msg`: Remove encryption-related params from already sent message. This allows to send received encrypted `dc_msg_t` object to unencrypted chat, e.g. in a Python bot.
+- Set message download state to Failure on IMAP errors. This avoids partially downloaded messages getting stuck in "Downloading..." state without actually being in a download queue.
+- BCC-to-self even if server deletion is set to "at once". This is a workaround for SMTP servers which do not return response in time, BCC-self works as a confirmation that message was sent out successfully and does not need more retries.
+- node: Run tests with native ESM modules instead of `esm` ([#5194](https://github.com/deltachat/deltachat-core-rust/pull/5194)).
+- Use Quoted-Printable MIME encoding for the text part ([#3986](https://github.com/deltachat/deltachat-core-rust/pull/3986)).
+
+### Tests
+
+- python: Add `get_protected_chat` to testplugin.py.
+
 ## [1.133.0] - 2024-01-14
 
 ### Features / Changes
@@ -3414,3 +3436,4 @@ https://github.com/deltachat/deltachat-core-rust/pulls?q=is%3Apr+is%3Aclosed
 [1.132.0]: https://github.com/deltachat/deltachat-core-rust/compare/v1.131.9...v1.132.0
 [1.132.1]: https://github.com/deltachat/deltachat-core-rust/compare/v1.132.0...v1.132.1
 [1.133.0]: https://github.com/deltachat/deltachat-core-rust/compare/v1.132.1...v1.133.0
+[1.133.1]: https://github.com/deltachat/deltachat-core-rust/compare/v1.133.0...v1.133.1
diff --git a/Cargo.lock b/Cargo.lock
index 0476b5da5..6937a5711 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1089,7 +1089,7 @@ dependencies = [
 
 [[package]]
 name = "deltachat"
-version = "1.133.0"
+version = "1.133.1"
 dependencies = [
  "ansi_term",
  "anyhow",
@@ -1168,7 +1168,7 @@ dependencies = [
 
 [[package]]
 name = "deltachat-jsonrpc"
-version = "1.133.0"
+version = "1.133.1"
 dependencies = [
  "anyhow",
  "async-channel 2.1.1",
@@ -1192,7 +1192,7 @@ dependencies = [
 
 [[package]]
 name = "deltachat-repl"
-version = "1.133.0"
+version = "1.133.1"
 dependencies = [
  "ansi_term",
  "anyhow",
@@ -1207,7 +1207,7 @@ dependencies = [
 
 [[package]]
 name = "deltachat-rpc-server"
-version = "1.133.0"
+version = "1.133.1"
 dependencies = [
  "anyhow",
  "deltachat",
@@ -1232,7 +1232,7 @@ dependencies = [
 
 [[package]]
 name = "deltachat_ffi"
-version = "1.133.0"
+version = "1.133.1"
 dependencies = [
  "anyhow",
  "deltachat",
diff --git a/Cargo.toml b/Cargo.toml
index 5520132cc..e246a7b36 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat"
-version = "1.133.0"
+version = "1.133.1"
 edition = "2021"
 license = "MPL-2.0"
 rust-version = "1.70"
diff --git a/deltachat-ffi/Cargo.toml b/deltachat-ffi/Cargo.toml
index 142e24005..27942d2c1 100644
--- a/deltachat-ffi/Cargo.toml
+++ b/deltachat-ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat_ffi"
-version = "1.133.0"
+version = "1.133.1"
 description = "Deltachat FFI"
 edition = "2018"
 readme = "README.md"
diff --git a/deltachat-jsonrpc/Cargo.toml b/deltachat-jsonrpc/Cargo.toml
index 0050029be..5ed4bda6b 100644
--- a/deltachat-jsonrpc/Cargo.toml
+++ b/deltachat-jsonrpc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat-jsonrpc"
-version = "1.133.0"
+version = "1.133.1"
 description = "DeltaChat JSON-RPC API"
 edition = "2021"
 default-run = "deltachat-jsonrpc-server"
diff --git a/deltachat-jsonrpc/typescript/package.json b/deltachat-jsonrpc/typescript/package.json
index 90215a5eb..62be6a60c 100644
--- a/deltachat-jsonrpc/typescript/package.json
+++ b/deltachat-jsonrpc/typescript/package.json
@@ -53,5 +53,5 @@
   },
   "type": "module",
   "types": "dist/deltachat.d.ts",
-  "version": "1.133.0"
+  "version": "1.133.1"
 }
diff --git a/deltachat-repl/Cargo.toml b/deltachat-repl/Cargo.toml
index 5c8f0fa74..47a9933d2 100644
--- a/deltachat-repl/Cargo.toml
+++ b/deltachat-repl/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat-repl"
-version = "1.133.0"
+version = "1.133.1"
 license = "MPL-2.0"
 edition = "2021"
 
diff --git a/deltachat-rpc-server/Cargo.toml b/deltachat-rpc-server/Cargo.toml
index 5bdc62b77..68a25f938 100644
--- a/deltachat-rpc-server/Cargo.toml
+++ b/deltachat-rpc-server/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "deltachat-rpc-server"
-version = "1.133.0"
+version = "1.133.1"
 description = "DeltaChat JSON-RPC server"
 edition = "2021"
 readme = "README.md"
diff --git a/node/constants.js b/node/constants.js
index c16e97eda..7c50ca55d 100644
--- a/node/constants.js
+++ b/node/constants.js
@@ -80,6 +80,7 @@ module.exports = {
   DC_INFO_EPHEMERAL_TIMER_CHANGED: 10,
   DC_INFO_GROUP_IMAGE_CHANGED: 3,
   DC_INFO_GROUP_NAME_CHANGED: 2,
+  DC_INFO_INVALID_UNENCRYPTED_MAIL: 13,
   DC_INFO_LOCATIONSTREAMING_ENABLED: 8,
   DC_INFO_LOCATION_ONLY: 9,
   DC_INFO_MEMBER_ADDED_TO_GROUP: 4,
@@ -226,11 +227,13 @@ module.exports = {
   DC_STR_GROUP_NAME_CHANGED_BY_YOU: 124,
   DC_STR_IMAGE: 9,
   DC_STR_INCOMING_MESSAGES: 103,
+  DC_STR_INVALID_UNENCRYPTED_MAIL: 174,
   DC_STR_LAST_MSG_SENT_SUCCESSFULLY: 111,
   DC_STR_LOCATION: 66,
   DC_STR_LOCATION_ENABLED_BY_OTHER: 137,
   DC_STR_LOCATION_ENABLED_BY_YOU: 136,
   DC_STR_MESSAGES: 114,
+  DC_STR_MESSAGE_ADD_MEMBER: 173,
   DC_STR_MSGACTIONBYME: 63,
   DC_STR_MSGACTIONBYUSER: 62,
   DC_STR_MSGADDMEMBER: 17,
diff --git a/node/lib/constants.ts b/node/lib/constants.ts
index 8ee7be363..9eba1b4b6 100644
--- a/node/lib/constants.ts
+++ b/node/lib/constants.ts
@@ -80,6 +80,7 @@ export enum C {
   DC_INFO_EPHEMERAL_TIMER_CHANGED = 10,
   DC_INFO_GROUP_IMAGE_CHANGED = 3,
   DC_INFO_GROUP_NAME_CHANGED = 2,
+  DC_INFO_INVALID_UNENCRYPTED_MAIL = 13,
   DC_INFO_LOCATIONSTREAMING_ENABLED = 8,
   DC_INFO_LOCATION_ONLY = 9,
   DC_INFO_MEMBER_ADDED_TO_GROUP = 4,
@@ -226,11 +227,13 @@ export enum C {
   DC_STR_GROUP_NAME_CHANGED_BY_YOU = 124,
   DC_STR_IMAGE = 9,
   DC_STR_INCOMING_MESSAGES = 103,
+  DC_STR_INVALID_UNENCRYPTED_MAIL = 174,
   DC_STR_LAST_MSG_SENT_SUCCESSFULLY = 111,
   DC_STR_LOCATION = 66,
   DC_STR_LOCATION_ENABLED_BY_OTHER = 137,
   DC_STR_LOCATION_ENABLED_BY_YOU = 136,
   DC_STR_MESSAGES = 114,
+  DC_STR_MESSAGE_ADD_MEMBER = 173,
   DC_STR_MSGACTIONBYME = 63,
   DC_STR_MSGACTIONBYUSER = 62,
   DC_STR_MSGADDMEMBER = 17,
diff --git a/package.json b/package.json
index bac045d6b..489f36f7b 100644
--- a/package.json
+++ b/package.json
@@ -55,5 +55,5 @@
     "test:mocha": "mocha node/test/test.mjs --growl --reporter=spec --bail --exit"
   },
   "types": "node/dist/index.d.ts",
-  "version": "1.133.0"
+  "version": "1.133.1"
 }
diff --git a/release-date.in b/release-date.in
index 6952f029e..ddc64e809 100644
--- a/release-date.in
+++ b/release-date.in
@@ -1 +1 @@
-2024-01-14
\ No newline at end of file
+2024-01-21
\ No newline at end of file