diff --git a/CHANGELOG.md b/CHANGELOG.md
index 846a8d51c..1a00edab1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Change Log
 
+## [1.1.0a4] - 2021-04-30
+
+### Changed
+
+- Files in source distributions now have a deterministic time to improve reproducibility. ([#142](https://github.com/python-poetry/poetry-core/pull/142))
+
+### Fixed
+
+- Fixed an error where leading zeros in the local build part of version specifications were discarded. ([#167](https://github.com/python-poetry/poetry-core/pull/167))
+- Fixed the PEP 508 representation of file dependencies. ([#153](https://github.com/python-poetry/poetry-core/pull/153))
+- Fixed the copy of `Package` instances which led to file hashes not being available. ([#159](https://github.com/python-poetry/poetry-core/pull/159))
+- Fixed an error in the parsing of caret requirements with a pre-release lower bound. ([#171](https://github.com/python-poetry/poetry-core/pull/171))
+- Fixed an error where some pre-release versions were not flagged as pre-releases. ([#170](https://github.com/python-poetry/poetry-core/pull/170))
+
+
 ## [1.1.0a3] - 2021-04-09
 
 ### Fixed
@@ -180,7 +195,8 @@ No changes.
 - Fixed support for stub-only packages ([#28](https://github.com/python-poetry/core/pull/28)).
 
 
-[Unreleased]: https://github.com/python-poetry/poetry-core/compare/1.1.0a3...master
+[Unreleased]: https://github.com/python-poetry/poetry-core/compare/1.1.0a4...master
+[1.1.0a4]: https://github.com/python-poetry/poetry-core/releases/tag/1.1.0a4
 [1.1.0a3]: https://github.com/python-poetry/poetry-core/releases/tag/1.1.0a3
 [1.1.0a2]: https://github.com/python-poetry/poetry-core/releases/tag/1.1.0a2
 [1.1.0a1]: https://github.com/python-poetry/poetry-core/releases/tag/1.1.0a1
diff --git a/poetry/core/__init__.py b/poetry/core/__init__.py
index 7bbf31b47..9de484199 100644
--- a/poetry/core/__init__.py
+++ b/poetry/core/__init__.py
@@ -3,7 +3,7 @@
 from pathlib import Path
 
 
-__version__ = "1.1.0a3"
+__version__ = "1.1.0a4"
 
 __vendor_site__ = (Path(__file__).parent / "_vendor").as_posix()
 
diff --git a/pyproject.toml b/pyproject.toml
index f623645ab..6e6e289dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "poetry-core"
-version = "1.1.0a3"
+version = "1.1.0a4"
 description = "Poetry PEP 517 Build Backend"
 authors = ["Sébastien Eustace <sebastien@eustace.io>"]