heroku · edmorley · Dec 4, 2025 · Dec 4, 2025
@@ -2,6 +2,7 @@
 
 ## [Unreleased]
 
+- Changed the default Python version for new apps from 3.13 to 3.14. ([#1984](https://github.com/heroku/heroku-buildpack-python/pull/1984))
 
 ## [v322] - 2025-12-02
 

@@ -25,9 +25,9 @@ When using the package manager [uv](https://docs.astral.sh/uv/) a `.python-versi
 
 We recommend that you specify a Python version for your app rather than relying on the buildpack's default Python version.
 
-For example, to request the latest patch release of Python 3.13, create a `.python-version` file in
+For example, to request the latest patch release of Python 3.14, create a `.python-version` file in
 the root directory of your app containing:
-`3.13`
+`3.14`
 
 We strongly recommend that you use the major version form instead of pinning to an exact version,
 since it will allow your app to receive Python security updates.
@@ -43,7 +43,7 @@ If none of those are found, the buildpack will use a default Python version for
 build of an app, and then subsequent builds of that app will be pinned to that version
 unless the build cache is cleared or you request a different version.
 
-The current default Python version is: 3.13
+The current default Python version is: 3.14
 
 The supported Python versions are:
 

@@ -130,9 +130,9 @@ function pip::install_dependencies() {
 
 	# The sed usage is to reduce the verbosity of output lines like:
 	# ...when using Python 3.10 and older:
-	# "Requirement already satisfied: typing-extensions==4.12.2 in ./.heroku/python/lib/python3.10/site-packages (from -r requirements.txt (line 2)) (4.12.2)"
+	# "Requirement already satisfied: typing-extensions==4.15.0 in ./.heroku/python/lib/python3.10/site-packages (from -r requirements.txt (line 2)) (4.15.0)"
 	# ...when using Python 3.11+:
-	# "Requirement already satisfied: typing-extensions==4.12.2 in /app/.heroku/python/lib/python3.13/site-packages (from -r requirements.txt (line 5)) (4.12.2)"
+	# "Requirement already satisfied: typing-extensions==4.15.0 in /app/.heroku/python/lib/python3.14/site-packages (from -r requirements.txt (line 5)) (4.15.0)"
 	# shellcheck disable=SC2310 # This function is invoked in an 'if' condition so set -e will be disabled.
 	if ! {
 		"${pip_install_command[@]}" \

@@ -14,7 +14,7 @@ LATEST_PYTHON_3_14="3.14.1"
 OLDEST_SUPPORTED_PYTHON_3_MINOR_VERSION=9
 NEWEST_SUPPORTED_PYTHON_3_MINOR_VERSION=14
 
-DEFAULT_PYTHON_FULL_VERSION="${LATEST_PYTHON_3_13}"
+DEFAULT_PYTHON_FULL_VERSION="${LATEST_PYTHON_3_14}"
 DEFAULT_PYTHON_MAJOR_VERSION="${DEFAULT_PYTHON_FULL_VERSION%.*}"
 
 # Integer with no redundant leading zeros.

@@ -1 +1 @@
-3.13
+3.14
@@ -1,2 +1,2 @@
 # This package has been picked since it has no dependencies and is small/fast to install.
-typing-extensions==4.12.2
+typing-extensions==4.15.0
@@ -1 +1 @@
-3.13
+3.14
@@ -1 +1 @@
-3.13
+3.14
@@ -1,7 +1,7 @@
 [project]
 name = "ci-poetry"
 version = "0.0.0"
-requires-python = ">=3.13"
+requires-python = ">=3.14"
 dependencies = [
     "typing-extensions",
 ]

@@ -1 +1 @@
-3.13
+3.14
@@ -1,7 +1,7 @@
 [project]
 name = "ci-uv"
 version = "0.0.0"
-requires-python = ">=3.13"
+requires-python = ">=3.14"
 dependencies = [
     "typing-extensions",
 ]

@@ -1 +1 @@
-3.13
+3.14
@@ -1 +1 @@
-3.13
+3.14
@@ -2,4 +2,4 @@
 # in order to test that symlinked requirements files work.
 
 # This package has been picked since it has no dependencies and is small/fast to install.
-typing-extensions==4.12.2
+typing-extensions==4.15.0
@@ -1,2 +1,2 @@
 # This package has been picked since it has no dependencies and is small/fast to install.
-typing-extensions==4.14.1
+typing-extensions==4.15.0
@@ -10,4 +10,4 @@ typing-extensions = "*"
 [dev-packages]
 
 [requires]
-python_version = "3.13"
+python_version = "3.14"
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2,6 +2,7 @@

		## [Unreleased]

		- Changed the default Python version for new apps from 3.13 to 3.14. ([#1984](https://github.com/heroku/heroku-buildpack-python/pull/1984))

		## [v322] - 2025-12-02

Expand Down