diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ebe9a3..0c92bbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.3.12] - 2023-02-23
+
+### Added
+
+### Changed
+
+### Fixed
+
+- Fix TypeError: isinstance() arg 2 must be a type or tuple of types when records have Enum fields
+
 ## [0.3.11] - 2023-02-21
 
 ### Added
diff --git a/docs/change-log.md b/docs/change-log.md
index cbb660e..f9152d9 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.3.12] - 2023-02-23
+
+### Added
+
+### Changed
+
+### Fixed
+
+- Fix TypeError: isinstance() arg 2 must be a type or tuple of types when records have Enum fields
+
 ## [0.3.11] - 2023-02-21
 
 ### Added
diff --git a/pyproject.toml b/pyproject.toml
index 0ea091f..120bff3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "funml"
-version = "0.3.11"
+version = "0.3.12"
 description = "A collection of utilities to help write python as though it were an ML-kind of functional language like OCaml"
 authors = ["Martin <team.sopherapps@gmail.com>"]
 readme = "README.md"