diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4d9268a..4c4827b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.4.0](https://github.com/CAST-genomics/haptools/compare/v0.3.0...v0.4.0) (2023-12-26)
+
+
+### Features
+
+* a new `GenotypesPLINKTR` class for reading TRs from PGEN files ([#222](https://github.com/CAST-genomics/haptools/issues/222)) ([3c7abe6](https://github.com/CAST-genomics/haptools/commit/3c7abe6922e8d6953debf3b0d6a02dee9610bbda))
+
+
+### Bug Fixes
+
+* `UnboundLocalError` arising from headerless `.hap` files ([#229](https://github.com/CAST-genomics/haptools/issues/229)) ([a499b0c](https://github.com/CAST-genomics/haptools/commit/a499b0cd294c7709f866c330f7ce7431320acfbd))
+* bug where `Phenotypes.subset(inplace=True)` would raise an AttributeError ([#226](https://github.com/CAST-genomics/haptools/issues/226)) ([cff6d9b](https://github.com/CAST-genomics/haptools/commit/cff6d9b0082a6170c7b0873b25445fd0915f9aab))
+
 ## [0.3.0](https://github.com/CAST-genomics/haptools/compare/v0.2.1...v0.3.0) (2023-06-02)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 0fad38ac..10837814 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "haptools"
-version = "0.3.0"
+version = "0.4.0"
 description = "Ancestry and haplotype aware simulation of genotypes and phenotypes for complex trait analysis"
 authors = ["Arya Massarat", "Michael Lamkin"]
 license = "MIT"