diff --git a/.github/workflows/ci_test-vector-handler.yaml b/.github/workflows/ci_test-vector-handler.yaml
index 2fcd22fc9..8a142096d 100644
--- a/.github/workflows/ci_test-vector-handler.yaml
+++ b/.github/workflows/ci_test-vector-handler.yaml
@@ -19,7 +19,7 @@ jobs:
         os:
           - ubuntu-latest
           - windows-latest
-          - macos-latest
+          - macos-12
         python:
           - 3.8
           - 3.x
@@ -34,7 +34,7 @@ jobs:
           # x86 builds are only meaningful for Windows
           - os: ubuntu-latest
             architecture: x86
-          - os: macos-latest
+          - os: macos-12
             architecture: x86
     steps:
       - uses: aws-actions/configure-aws-credentials@v4
diff --git a/.github/workflows/ci_tests.yaml b/.github/workflows/ci_tests.yaml
index 3187b8db0..b03c47163 100644
--- a/.github/workflows/ci_tests.yaml
+++ b/.github/workflows/ci_tests.yaml
@@ -30,7 +30,7 @@ jobs:
           # (i.e. doo files, per-package module names)
           # Disable for now
           # - windows-latest
-          - macos-latest
+          - macos-12
         python:
           - 3.7
           - 3.8
@@ -59,7 +59,7 @@ jobs:
           # x86 builds are only meaningful for Windows
           - os: ubuntu-latest
             architecture: x86
-          - os: macos-latest
+          - os: macos-12
             architecture: x86
           # MPL is not supported on <3.11
           - python: 3.7
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index cfb4bdcdb..000000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,113 +0,0 @@
-# https://packaging.python.org/guides/supporting-windows-using-appveyor/
-
-environment:
-
-  matrix:
-    # The only test we perform on Windows are our actual code tests. All linting, static
-    # analysis, etc are only run on Linux (via Travis CI).
-
-    # Python 2.7
-    - PYTHON: "C:\\Python27"
-      TOXENV: "py27-local"
-    - PYTHON: "C:\\Python27"
-      TOXENV: "py27-integ"
-    - PYTHON: "C:\\Python27"
-      TOXENV: "py27-accept"
-    - PYTHON: "C:\\Python27"
-      TOXENV: "py27-examples"
-    - PYTHON: "C:\\Python27-x64"
-      TOXENV: "py27-local"
-    - PYTHON: "C:\\Python27-x64"
-      TOXENV: "py27-integ"
-    - PYTHON: "C:\\Python27-x64"
-      TOXENV: "py27-accept"
-    - PYTHON: "C:\\Python27-x64"
-      TOXENV: "py27-examples"
-
-    # Python 3.4
-    - PYTHON: "C:\\Python34"
-      TOXENV: "py34-local"
-    - PYTHON: "C:\\Python34"
-      TOXENV: "py34-integ"
-    - PYTHON: "C:\\Python34"
-      TOXENV: "py34-accept"
-    - PYTHON: "C:\\Python34"
-      TOXENV: "py34-examples"
-    - PYTHON: "C:\\Python34-x64"
-      DISTUTILS_USE_SDK: "1"
-      TOXENV: "py34-local"
-    - PYTHON: "C:\\Python34-x64"
-      DISTUTILS_USE_SDK: "1"
-      TOXENV: "py34-integ"
-    - PYTHON: "C:\\Python34-x64"
-      DISTUTILS_USE_SDK: "1"
-      TOXENV: "py34-accept"
-    - PYTHON: "C:\\Python34-x64"
-      DISTUTILS_USE_SDK: "1"
-      TOXENV: "py34-examples"
-
-    # Python 3.5
-    - PYTHON: "C:\\Python35"
-      TOXENV: "py35-local"
-    - PYTHON: "C:\\Python35"
-      TOXENV: "py35-integ"
-    - PYTHON: "C:\\Python35"
-      TOXENV: "py35-accept"
-    - PYTHON: "C:\\Python35"
-      TOXENV: "py35-examples"
-    - PYTHON: "C:\\Python35-x64"
-      TOXENV: "py35-local"
-    - PYTHON: "C:\\Python35-x64"
-      TOXENV: "py35-integ"
-    - PYTHON: "C:\\Python35-x64"
-      TOXENV: "py35-accept"
-    - PYTHON: "C:\\Python35-x64"
-      TOXENV: "py35-examples"
-
-    # Python 3.6
-    - PYTHON: "C:\\Python36"
-      TOXENV: "py36-local"
-    - PYTHON: "C:\\Python36"
-      TOXENV: "py36-integ"
-    - PYTHON: "C:\\Python36"
-      TOXENV: "py36-accept"
-    - PYTHON: "C:\\Python36"
-      TOXENV: "py36-examples"
-    - PYTHON: "C:\\Python36-x64"
-      TOXENV: "py36-local"
-    - PYTHON: "C:\\Python36-x64"
-      TOXENV: "py36-integ"
-    - PYTHON: "C:\\Python36-x64"
-      TOXENV: "py36-accept"
-    - PYTHON: "C:\\Python36-x64"
-      TOXENV: "py36-examples"
-
-    # Python 3.7
-    - PYTHON: "C:\\Python37"
-      TOXENV: "py37-local"
-    - PYTHON: "C:\\Python37"
-      TOXENV: "py37-integ"
-    - PYTHON: "C:\\Python37"
-      TOXENV: "py37-accept"
-    - PYTHON: "C:\\Python37"
-      TOXENV: "py37-examples"
-    - PYTHON: "C:\\Python37-x64"
-      TOXENV: "py37-local"
-    - PYTHON: "C:\\Python37-x64"
-      TOXENV: "py37-integ"
-    - PYTHON: "C:\\Python37-x64"
-      TOXENV: "py37-accept"
-    - PYTHON: "C:\\Python37-x64"
-      TOXENV: "py37-examples"
-
-install:
-  # Prepend newly installed Python to the PATH of this build
-  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  # Check the Python version to verify the correct version was installed
-  - "python --version"
-  - "python -m pip install wheel tox"
-
-build: off
-
-test_script:
-  - "tox"
diff --git a/src/aws_encryption_sdk/__init__.py b/src/aws_encryption_sdk/__init__.py
index 74732bfc5..66b779fa5 100644
--- a/src/aws_encryption_sdk/__init__.py
+++ b/src/aws_encryption_sdk/__init__.py
@@ -164,7 +164,7 @@ def decrypt(self, **kwargs):
             ...     'arn:aws:kms:us-east-1:2222222222222:key/22222222-2222-2222-2222-222222222222',
             ...     'arn:aws:kms:us-east-1:3333333333333:key/33333333-3333-3333-3333-333333333333'
             ... ])
-            >>> my_ciphertext, encryptor_header = client.decrypt(
+            >>> my_plaintext, decryptor_header = client.decrypt(
             ...     source=my_ciphertext,
             ...     key_provider=kms_key_provider
             ... )