diff --git a/CHANGELOG.md b/CHANGELOG.md
index bd0cec22e..a2cf250bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 ## Unreleased
 
 - Added support for Python 3.12. ([#1490](https://github.com/heroku/heroku-buildpack-python/pull/1490))
+- Added support for Python 3.11.6. ([#1491](https://github.com/heroku/heroku-buildpack-python/pull/1491))
+- Changed the default Python version for new apps from 3.11.5 to 3.11.6. ([#1491](https://github.com/heroku/heroku-buildpack-python/pull/1491))
 
 ## v235 (2023-08-25)
 
diff --git a/README.md b/README.md
index 6483aeda2..6ab2c9aee 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ A `requirements.txt` must be present at the root of your application's repositor
 
 To specify your python version, you also need a `runtime.txt` file - unless you are using the default Python runtime version.
 
-Current default Python Runtime: Python 3.11.5
+Current default Python Runtime: Python 3.11.6
 
 Alternatively, you can provide a `setup.py` file, or a `Pipfile`.
 Using `pipenv` will generate `runtime.txt` at build time if one of the field `python_version` or `python_full_version` is specified in the `requires` section of your `Pipfile`.
@@ -61,7 +61,7 @@ Specify a Python Runtime
 Supported runtime options include:
 
 - `python-3.12.0` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
-- `python-3.11.5` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
+- `python-3.11.6` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
 - `python-3.10.13` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
 - `python-3.9.18` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
 - `python-3.8.18` on Heroku-20 only
diff --git a/bin/default_pythons b/bin/default_pythons
index 6789ed39d..2a044bb52 100755
--- a/bin/default_pythons
+++ b/bin/default_pythons
@@ -6,7 +6,7 @@
 # shellcheck disable=2034
 
 LATEST_312="python-3.12.0"
-LATEST_311="python-3.11.5"
+LATEST_311="python-3.11.6"
 LATEST_310="python-3.10.13"
 LATEST_39="python-3.9.18"
 LATEST_38="python-3.8.18"
diff --git a/spec/fixtures/python_3.11/runtime.txt b/spec/fixtures/python_3.11/runtime.txt
index 3124d55e9..76b6e496e 100644
--- a/spec/fixtures/python_3.11/runtime.txt
+++ b/spec/fixtures/python_3.11/runtime.txt
@@ -1 +1 @@
-python-3.11.5
+python-3.11.6
diff --git a/spec/hatchet/python_version_spec.rb b/spec/hatchet/python_version_spec.rb
index bce79d2da..6f8cde80e 100644
--- a/spec/hatchet/python_version_spec.rb
+++ b/spec/hatchet/python_version_spec.rb
@@ -175,7 +175,7 @@
     include_examples 'builds with the requested Python version', LATEST_PYTHON_3_10
   end
 
-  context 'when runtime.txt contains python-3.11.5' do
+  context 'when runtime.txt contains python-3.11.6' do
     let(:app) { Hatchet::Runner.new('spec/fixtures/python_3.11') }
 
     include_examples 'builds with the requested Python version', LATEST_PYTHON_3_11
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 3aeeb02bd..1bbcaaff3 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -10,7 +10,7 @@
 LATEST_PYTHON_3_8 = '3.8.18'
 LATEST_PYTHON_3_9 = '3.9.18'
 LATEST_PYTHON_3_10 = '3.10.13'
-LATEST_PYTHON_3_11 = '3.11.5'
+LATEST_PYTHON_3_11 = '3.11.6'
 LATEST_PYTHON_3_12 = '3.12.0'
 DEFAULT_PYTHON_VERSION = LATEST_PYTHON_3_11