diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9023ecf17..52d61ee33 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Use Python 3.11 as the default Python version for new apps (previously Python 3.10) ([#1408](https://github.com/heroku/heroku-buildpack-python/pull/1408)).
 
 ## v225 (2023-02-08)
 
diff --git a/README.md b/README.md
index 866990ae1..7074f808b 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 3.10.10
+Current default Python Runtime: Python 3.11.2
 
 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`.
diff --git a/bin/default_pythons b/bin/default_pythons
index 7b94586a0..f69e55eda 100755
--- a/bin/default_pythons
+++ b/bin/default_pythons
@@ -15,4 +15,4 @@ LATEST_36="python-3.6.15"
 LATEST_35="python-3.5.10"
 LATEST_34="python-3.4.10"
 LATEST_27="python-2.7.18"
-DEFAULT_PYTHON_VERSION="${LATEST_310}"
+DEFAULT_PYTHON_VERSION="${LATEST_311}"
diff --git a/spec/hatchet/nltk_spec.rb b/spec/hatchet/nltk_spec.rb
index f5ed8922e..bc9789dbb 100644
--- a/spec/hatchet/nltk_spec.rb
+++ b/spec/hatchet/nltk_spec.rb
@@ -12,7 +12,6 @@
           remote: -----> Downloading NLTK corpora…
           remote: -----> Downloading NLTK packages: city_database stopwords
           remote: .*: RuntimeWarning: 'nltk.downloader' found in sys.modules after import of package 'nltk', but prior to execution of 'nltk.downloader'; this may result in unpredictable behaviour
-          remote:   warn\\(RuntimeWarning\\(msg\\)\\)
           remote: \\[nltk_data\\] Downloading package city_database to
           remote: \\[nltk_data\\]     /tmp/build_.*/.heroku/python/nltk_data...
           remote: \\[nltk_data\\]   Unzipping corpora/city_database.zip.
diff --git a/spec/hatchet/stack_spec.rb b/spec/hatchet/stack_spec.rb
index bfbbf1521..cc1965e59 100644
--- a/spec/hatchet/stack_spec.rb
+++ b/spec/hatchet/stack_spec.rb
@@ -56,10 +56,10 @@
           remote: -----> No Python version was specified. Using the same version as the last build: python-#{DEFAULT_PYTHON_VERSION}
           remote:        To use a different version, see: https://devcenter.heroku.com/articles/python-runtimes
           remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by python)
-          remote: python: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.35' not found (required by /app/.heroku/python/lib/libpython3.10.so.1.0)
-          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /app/.heroku/python/lib/libpython3.10.so.1.0)
-          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /app/.heroku/python/lib/libpython3.10.so.1.0)
-          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /app/.heroku/python/lib/libpython3.10.so.1.0)
+          remote: python: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.35' not found (required by /app/.heroku/python/lib/libpython3.11.so.1.0)
+          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /app/.heroku/python/lib/libpython3.11.so.1.0)
+          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /app/.heroku/python/lib/libpython3.11.so.1.0)
+          remote: python: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /app/.heroku/python/lib/libpython3.11.so.1.0)
           remote: -----> Stack has changed from heroku-22 to heroku-20, clearing cache
           remote: -----> No change in requirements detected, installing from cache
           remote: -----> Installing python-#{DEFAULT_PYTHON_VERSION}
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7419a41e8..4ba810952 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -12,7 +12,7 @@
 LATEST_PYTHON_3_9 = '3.9.16'
 LATEST_PYTHON_3_10 = '3.10.10'
 LATEST_PYTHON_3_11 = '3.11.2'
-DEFAULT_PYTHON_VERSION = LATEST_PYTHON_3_10
+DEFAULT_PYTHON_VERSION = LATEST_PYTHON_3_11
 
 # Work around the return value for `default_buildpack` changing after deploy:
 # https://github.com/heroku/hatchet/issues/180