diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed8c9f3..ed3794b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- The default Python version is now 3.11.3 (previously 3.11.2).
 
 ## [0.1.0] - 2023-03-06
 
diff --git a/src/python_version.rs b/src/python_version.rs
index 456725e..202ef56 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: 2,
+    patch: 3,
 };
 
 /// Representation of a specific Python `X.Y.Z` version.
diff --git a/tests/fixtures/python_3.10/runtime.txt b/tests/fixtures/python_3.10/runtime.txt
index 9769138..c2d5a35 100644
--- a/tests/fixtures/python_3.10/runtime.txt
+++ b/tests/fixtures/python_3.10/runtime.txt
@@ -1 +1 @@
-python-3.10.10
+python-3.10.11
diff --git a/tests/fixtures/python_3.11/runtime.txt b/tests/fixtures/python_3.11/runtime.txt
index 04d03e3..afe12ad 100644
--- a/tests/fixtures/python_3.11/runtime.txt
+++ b/tests/fixtures/python_3.11/runtime.txt
@@ -1 +1 @@
-python-3.11.2
+python-3.11.3
diff --git a/tests/integration/mod.rs b/tests/integration/mod.rs
index 43afd4f..a301a6e 100644
--- a/tests/integration/mod.rs
+++ b/tests/integration/mod.rs
@@ -12,8 +12,8 @@ mod salesforce_functions;
 const LATEST_PYTHON_3_7: &str = "3.7.16";
 const LATEST_PYTHON_3_8: &str = "3.8.16";
 const LATEST_PYTHON_3_9: &str = "3.9.16";
-const LATEST_PYTHON_3_10: &str = "3.10.10";
-const LATEST_PYTHON_3_11: &str = "3.11.2";
+const LATEST_PYTHON_3_10: &str = "3.10.11";
+const LATEST_PYTHON_3_11: &str = "3.11.3";
 const DEFAULT_PYTHON_VERSION: &str = LATEST_PYTHON_3_11;
 
 const DEFAULT_BUILDER: &str = "heroku/builder:22";
diff --git a/tests/integration/pip.rs b/tests/integration/pip.rs
index f3c1723..7cd590f 100644
--- a/tests/integration/pip.rs
+++ b/tests/integration/pip.rs
@@ -210,7 +210,7 @@ fn cache_discarded_on_multiple_changes() {
                     [Installing Python and packaging tools]
                     Discarding cache since:
                      - the stack has changed from heroku-20 to heroku-22
-                     - the Python version has changed from 3.10.10 to 3.11.2
+                     - the Python version has changed from {LATEST_PYTHON_3_10} to {LATEST_PYTHON_3_11}
                     Installing Python {LATEST_PYTHON_3_11}
                     Installing pip {pip_version}, setuptools {setuptools_version} and wheel {wheel_version}