diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59cf01c7c..2c000cb13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Python 3.10.11 and 3.11.3 are now available ([#1433](https://github.com/heroku/heroku-buildpack-python/pull/1433)).
+- The default Python version for new apps is now 3.11.3 (previously 3.11.2) ([#1433](https://github.com/heroku/heroku-buildpack-python/pull/1433)).
 
 ## v229 (2023-03-10)
 
diff --git a/README.md b/README.md
index 7074f808b..827731db0 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 3.11.2
+Current default Python Runtime: Python 3.11.3
 
 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`.
@@ -60,8 +60,8 @@ Specify a Python Runtime
 
 Supported runtime options include:
 
-- `python-3.11.2` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
-- `python-3.10.10` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
+- `python-3.11.3` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
+- `python-3.10.11` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
 - `python-3.9.16` on all [supported stacks](https://devcenter.heroku.com/articles/stack#stack-support-details)
 - `python-3.8.16` on Heroku-18 and Heroku-20 only
 - `python-3.7.16` on Heroku-18 and Heroku-20 only
diff --git a/bin/default_pythons b/bin/default_pythons
index ec0ef4820..49c74e5ee 100755
--- a/bin/default_pythons
+++ b/bin/default_pythons
@@ -5,8 +5,8 @@
 # the env vars to subprocesses.
 # shellcheck disable=2034
 
-LATEST_311="python-3.11.2"
-LATEST_310="python-3.10.10"
+LATEST_311="python-3.11.3"
+LATEST_310="python-3.10.11"
 LATEST_39="python-3.9.16"
 LATEST_38="python-3.8.16"
 LATEST_37="python-3.7.16"
diff --git a/spec/fixtures/pipenv_and_runtime_txt/runtime.txt b/spec/fixtures/pipenv_and_runtime_txt/runtime.txt
index 97691386f..c2d5a35eb 100644
--- a/spec/fixtures/pipenv_and_runtime_txt/runtime.txt
+++ b/spec/fixtures/pipenv_and_runtime_txt/runtime.txt
@@ -1 +1 @@
-python-3.10.10
+python-3.10.11
diff --git a/spec/fixtures/python_3.10/runtime.txt b/spec/fixtures/python_3.10/runtime.txt
index 97691386f..c2d5a35eb 100644
--- a/spec/fixtures/python_3.10/runtime.txt
+++ b/spec/fixtures/python_3.10/runtime.txt
@@ -1 +1 @@
-python-3.10.10
+python-3.10.11
diff --git a/spec/fixtures/python_3.11/runtime.txt b/spec/fixtures/python_3.11/runtime.txt
index 04d03e383..afe12ad1b 100644
--- a/spec/fixtures/python_3.11/runtime.txt
+++ b/spec/fixtures/python_3.11/runtime.txt
@@ -1 +1 @@
-python-3.11.2
+python-3.11.3
diff --git a/spec/fixtures/runtime_txt_only/runtime.txt b/spec/fixtures/runtime_txt_only/runtime.txt
index 97691386f..c2d5a35eb 100644
--- a/spec/fixtures/runtime_txt_only/runtime.txt
+++ b/spec/fixtures/runtime_txt_only/runtime.txt
@@ -1 +1 @@
-python-3.10.10
+python-3.10.11
diff --git a/spec/fixtures/runtime_txt_with_stray_whitespace/runtime.txt b/spec/fixtures/runtime_txt_with_stray_whitespace/runtime.txt
index da45af655..43ee2eca8 100644
--- a/spec/fixtures/runtime_txt_with_stray_whitespace/runtime.txt
+++ b/spec/fixtures/runtime_txt_with_stray_whitespace/runtime.txt
@@ -1,3 +1,3 @@
  
- python-3.10.10 
+ python-3.10.11 
  
\ No newline at end of file
diff --git a/spec/hatchet/python_version_spec.rb b/spec/hatchet/python_version_spec.rb
index 6b4bf64bd..424ff5ef9 100644
--- a/spec/hatchet/python_version_spec.rb
+++ b/spec/hatchet/python_version_spec.rb
@@ -267,13 +267,13 @@
     include_examples 'builds with the requested Python version', LATEST_PYTHON_3_9
   end
 
-  context 'when runtime.txt contains python-3.10.10' do
+  context 'when runtime.txt contains python-3.10.11' do
     let(:app) { Hatchet::Runner.new('spec/fixtures/python_3.10') }
 
     include_examples 'builds with the requested Python version', LATEST_PYTHON_3_10
   end
 
-  context 'when runtime.txt contains python-3.11.2' do
+  context 'when runtime.txt contains python-3.11.3' 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 f34d94f65..f7425afda 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -9,8 +9,8 @@
 LATEST_PYTHON_3_7 = '3.7.16'
 LATEST_PYTHON_3_8 = '3.8.16'
 LATEST_PYTHON_3_9 = '3.9.16'
-LATEST_PYTHON_3_10 = '3.10.10'
-LATEST_PYTHON_3_11 = '3.11.2'
+LATEST_PYTHON_3_10 = '3.10.11'
+LATEST_PYTHON_3_11 = '3.11.3'
 DEFAULT_PYTHON_VERSION = LATEST_PYTHON_3_11
 
 PIP_VERSION = '23.0.1'