diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3750e65..66b9479 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,8 +2,19 @@
 
 
 
+## v0.4.0 (2023-12-28)
+
+### Feature
+
+* feat: add pad_id and bos_id to jurassic_tokenizer (#69) ([`ffb2ce3`](https://github.com/AI21Labs/ai21-tokenizer/commit/ffb2ce38aa59eec03305c4fdc6bfedd99c7b5255))
+
+
 ## v0.3.11 (2023-12-27)
 
+### Chore
+
+* chore(release): v0.3.11 [skip ci] ([`5280149`](https://github.com/AI21Labs/ai21-tokenizer/commit/528014946c5d35bbd9a5c8fa8c6eed7754e1f2f1))
+
 ### Fix
 
 * fix: BaseTokenizer in init (#68) ([`3cc71e7`](https://github.com/AI21Labs/ai21-tokenizer/commit/3cc71e747a0b5d5450dbe70618456d415171ae23))
diff --git a/ai21_tokenizer/version.py b/ai21_tokenizer/version.py
index fa3e47a..6cc293e 100644
--- a/ai21_tokenizer/version.py
+++ b/ai21_tokenizer/version.py
@@ -1 +1 @@
-VERSION = "0.3.11"
+VERSION = "0.4.0"
diff --git a/pyproject.toml b/pyproject.toml
index ebe9e8a..587df8c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ schema_pattern = "(build|ci|docs|feat|fix|perf|refactor|style|test|chore|revert|
 
 [tool.poetry]
 name = "ai21-tokenizer"
-version = "0.3.11"
+version = "0.4.0"
 description = ""
 authors = ["AI21 Labs"]
 readme = "README.md"
@@ -108,6 +108,7 @@ newline_sequence = "\n"
 
 
 
+
 [tool.poetry.group.test.dependencies]
 coverage = "^7.1.0"
 pytest = "7.2.1"