diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45417b5..9207d01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Updated the default Python version from 3.11.5 to 3.11.6. ([#121](https://github.com/heroku/buildpacks-python/pull/121))
+
 ## [0.7.0] - 2023-09-19
 
 ### Added
diff --git a/src/python_version.rs b/src/python_version.rs
index 42453ba..b798034 100644
--- a/src/python_version.rs
+++ b/src/python_version.rs
@@ -9,7 +9,7 @@ use std::path::Path;
 pub(crate) const DEFAULT_PYTHON_VERSION: PythonVersion = PythonVersion {
     major: 3,
     minor: 11,
-    patch: 5,
+    patch: 6,
 };
 
 /// Representation of a specific Python `X.Y.Z` version.
diff --git a/tests/fixtures/python_3.11/runtime.txt b/tests/fixtures/python_3.11/runtime.txt
index 3124d55..76b6e49 100644
--- a/tests/fixtures/python_3.11/runtime.txt
+++ b/tests/fixtures/python_3.11/runtime.txt
@@ -1 +1 @@
-python-3.11.5
+python-3.11.6
diff --git a/tests/mod.rs b/tests/mod.rs
index e243b7d..25f1e46 100644
--- a/tests/mod.rs
+++ b/tests/mod.rs
@@ -15,7 +15,7 @@ const LATEST_PYTHON_3_7: &str = "3.7.17";
 const LATEST_PYTHON_3_8: &str = "3.8.18";
 const LATEST_PYTHON_3_9: &str = "3.9.18";
 const LATEST_PYTHON_3_10: &str = "3.10.13";
-const LATEST_PYTHON_3_11: &str = "3.11.5";
+const LATEST_PYTHON_3_11: &str = "3.11.6";
 const LATEST_PYTHON_3_12: &str = "3.12.0";
 const DEFAULT_PYTHON_VERSION: &str = LATEST_PYTHON_3_11;