diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87cbb58..0f9c414 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Updated Poetry from 1.8.3 to 1.8.4. ([#286](https://github.com/heroku/buildpacks-python/pull/286))
+
 ## [0.19.0] - 2024-10-10
 
 ### Added
diff --git a/requirements/poetry.txt b/requirements/poetry.txt
index 65e7a6c..8e44691 100644
--- a/requirements/poetry.txt
+++ b/requirements/poetry.txt
@@ -1 +1 @@
-poetry==1.8.3
+poetry==1.8.4
diff --git a/tests/poetry_test.rs b/tests/poetry_test.rs
index 8910fc4..4b24cfe 100644
--- a/tests/poetry_test.rs
+++ b/tests/poetry_test.rs
@@ -181,7 +181,7 @@ fn poetry_cache_previous_buildpack_version() {
                     Installing Python {DEFAULT_PYTHON_FULL_VERSION}
                     
                     [Installing Poetry]
-                    Discarding cached Poetry {POETRY_VERSION}
+                    Discarding cached Poetry 1.8.3
                     Installing Poetry {POETRY_VERSION}
                     
                     [Installing dependencies using Poetry]