diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 8ffa14601..a615dde3d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,16 @@
 Changelog
 *********
 
+4.0.3 -- 2025-09-03
+===================
+
+Maintenance
+-----------
+* deps: Extend supported `MPL`_ versions to include v1.11.1
+  `#770 <https://github.com/aws/aws-encryption-sdk-python/pull/770>`_
+
+  MPL v1.11.1 updates pytz version range to include 2025 releases.
+
 4.0.2 -- 2025-06-30
 ===================
 
diff --git a/codebuild/py312/decrypt_hkeyring_with_net.yml b/codebuild/py312/decrypt_hkeyring_with_net.yml
index e1816282b..d3ed7b7a3 100644
--- a/codebuild/py312/decrypt_hkeyring_with_net.yml
+++ b/codebuild/py312/decrypt_hkeyring_with_net.yml
@@ -34,6 +34,7 @@ phases:
 
       # Build MPL test vector runner from source
       - cd aws-encryption-sdk/mpl/TestVectorsAwsCryptographicMaterialProviders/
+      - make setup_net
       - make transpile_net
 
       # Change ESDK TestVectors project to reference the published .NET ESDK
@@ -46,4 +47,4 @@ phases:
   
   build:
     commands:
-      - dotnet test --framework net6.0
\ No newline at end of file
+      - dotnet test --framework net6.0
diff --git a/dev_requirements/linter-requirements.txt b/dev_requirements/linter-requirements.txt
index 1295e522d..188f43dab 100644
--- a/dev_requirements/linter-requirements.txt
+++ b/dev_requirements/linter-requirements.txt
@@ -6,6 +6,7 @@ flake8-bugbear==22.9.11
 flake8-docstrings==1.7.0
 flake8-print==5.0.0
 isort==5.11.4
+pbr==2.0.0 # needed due to to bandit
 pyflakes==2.4.0
 pylint==2.13.5
 readme_renderer==37.3
diff --git a/performance_tests/README.rst b/performance_tests/README.rst
index 401a2faab..8373f62d2 100644
--- a/performance_tests/README.rst
+++ b/performance_tests/README.rst
@@ -49,7 +49,7 @@ Required Prerequisites
 Recommended Prerequisites
 =========================
 
-* aws-cryptographic-material-providers: == 1.11.0
+* aws-cryptographic-material-providers: == 1.11.1
   * Requires Python 3.11+.
 
 *****
diff --git a/performance_tests/requirements_mpl.txt b/performance_tests/requirements_mpl.txt
index 5b7a4b0d6..4bc8fef3b 100644
--- a/performance_tests/requirements_mpl.txt
+++ b/performance_tests/requirements_mpl.txt
@@ -1 +1 @@
-aws-cryptographic-material-providers>=1.7.4,<=1.11.0
\ No newline at end of file
+aws-cryptographic-material-providers>=1.7.4,<=1.11.1
\ No newline at end of file
diff --git a/requirements_mpl.txt b/requirements_mpl.txt
index 73bcc3450..d7b32f4f0 100644
--- a/requirements_mpl.txt
+++ b/requirements_mpl.txt
@@ -1 +1 @@
-aws-cryptographic-material-providers>=1.7.4,<=1.11.0
+aws-cryptographic-material-providers>=1.7.4,<=1.11.1
diff --git a/setup.py b/setup.py
index 392b8ae65..7648c4cb9 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,5 @@
 """AWS Encryption SDK for Python."""
+
 import os
 import re
 
@@ -10,7 +11,9 @@
 
 def read(*args):
     """Reads complete file contents."""
-    return open(os.path.join(HERE, *args), encoding="utf-8").read()  # pylint: disable=consider-using-with
+    return open(
+        os.path.join(HERE, *args), encoding="utf-8"
+    ).read()  # pylint: disable=consider-using-with
 
 
 def get_version():
@@ -40,7 +43,7 @@ def get_requirements():
     license="Apache License 2.0",
     install_requires=get_requirements(),
     extras_require={
-        "MPL": ["aws-cryptographic-material-providers>=1.7.4,<=1.11.0"],
+        "MPL": ["aws-cryptographic-material-providers>=1.7.4,<=1.11.1"],
     },
     classifiers=[
         "Development Status :: 5 - Production/Stable",
diff --git a/src/aws_encryption_sdk/identifiers.py b/src/aws_encryption_sdk/identifiers.py
index 049f2057e..8d7f9f103 100644
--- a/src/aws_encryption_sdk/identifiers.py
+++ b/src/aws_encryption_sdk/identifiers.py
@@ -17,7 +17,7 @@
     # We only actually need these imports when running the mypy checks
     pass
 
-__version__ = "4.0.2"
+__version__ = "4.0.3"
 USER_AGENT_SUFFIX = "AwsEncryptionSdkPython/{}".format(__version__)
 
 
diff --git a/test_vector_handlers/requirements_mpl.txt b/test_vector_handlers/requirements_mpl.txt
index 73bcc3450..d7b32f4f0 100644
--- a/test_vector_handlers/requirements_mpl.txt
+++ b/test_vector_handlers/requirements_mpl.txt
@@ -1 +1 @@
-aws-cryptographic-material-providers>=1.7.4,<=1.11.0
+aws-cryptographic-material-providers>=1.7.4,<=1.11.1