diff --git a/.github/workflows/ci_tests.yaml b/.github/workflows/ci_tests.yaml
index 1a58792d..f4fddb65 100644
--- a/.github/workflows/ci_tests.yaml
+++ b/.github/workflows/ci_tests.yaml
@@ -30,6 +30,7 @@ jobs:
           - 3.9
           - "3.10"
           - "3.11"
+          - "3.12"
           - 3.x
         category:
           - local-slow
@@ -50,6 +51,7 @@ jobs:
         env:
           TOXENV: ${{ matrix.category }}
         run: tox -- -vv
+
   upstream-py3:
     runs-on: ubuntu-latest
     strategy:
@@ -71,6 +73,7 @@ jobs:
         env:
           TOXENV: ${{ matrix.category }}
         run: tox -- -vv
+
   upstream-py311:
     runs-on: ubuntu-latest
     strategy:
diff --git a/buildspec.yml b/buildspec.yml
index fb50c7b4..b0005071 100644
--- a/buildspec.yml
+++ b/buildspec.yml
@@ -5,12 +5,27 @@ batch:
   build-list:
     - identifier: python3_7
       buildspec: codebuild/python3.7.yml
+      env:
+        image: aws/codebuild/standard:5.0
     - identifier: python3_8
       buildspec: codebuild/python3.8.yml
+      env:
+        image: aws/codebuild/standard:5.0
     - identifier: python3_9
       buildspec: codebuild/python3.9.yml
+      env:
+        image: aws/codebuild/standard:5.0
     - identifier: python3_10
       buildspec: codebuild/python3.10.yml
-
+      env:
+        image: aws/codebuild/standard:6.0
+    - identifier: python3_11
+      buildspec: codebuild/python3.11.yml
+      env:
+        image: aws/codebuild/standard:7.0
+    - identifier: python3_12
+      buildspec: codebuild/python3.12.yml
+      env:
+        image: aws/codebuild/standard:7.0        
     - identifier: code_coverage
       buildspec: codebuild/coverage/coverage.yml
diff --git a/codebuild/python3.10.yml b/codebuild/python3.10.yml
index a18185dc..ad76049f 100644
--- a/codebuild/python3.10.yml
+++ b/codebuild/python3.10.yml
@@ -11,10 +11,8 @@ env:
 phases:
   install:
     runtime-versions:
-      python: latest
+      python: 3.10
   build:
     commands:
-      - pyenv install 3.10.0
-      - pyenv local 3.10.0
       - pip install "tox < 4.0"
       - tox
diff --git a/codebuild/python3.11.yml b/codebuild/python3.11.yml
new file mode 100644
index 00000000..b21cf15a
--- /dev/null
+++ b/codebuild/python3.11.yml
@@ -0,0 +1,18 @@
+version: 0.2
+
+env:
+  variables:
+    TOXENV: "py311-integ-slow"
+    AWS_ENCRYPTION_SDK_PYTHON_INTEGRATION_TEST_AWS_KMS_KEY_ID: >-
+      arn:aws:kms:us-west-2:658956600833:key/b3537ef1-d8dc-4780-9f5a-55776cbb2f7f
+    AWS_ENCRYPTION_SDK_PYTHON_INTEGRATION_TEST_AWS_KMS_KEY_ID_2: >-
+      arn:aws:kms:eu-central-1:658956600833:key/75414c93-5285-4b57-99c9-30c1cf0a22c2
+
+phases:
+  install:
+    runtime-versions:
+      python: 3.11
+  build:
+    commands:
+      - pip install "tox < 4.0"
+      - tox
diff --git a/codebuild/python3.12.yml b/codebuild/python3.12.yml
new file mode 100644
index 00000000..46576292
--- /dev/null
+++ b/codebuild/python3.12.yml
@@ -0,0 +1,23 @@
+version: 0.2
+
+env:
+  variables:
+    TOXENV: "py312-integ-slow"
+    AWS_ENCRYPTION_SDK_PYTHON_INTEGRATION_TEST_AWS_KMS_KEY_ID: >-
+      arn:aws:kms:us-west-2:658956600833:key/b3537ef1-d8dc-4780-9f5a-55776cbb2f7f
+    AWS_ENCRYPTION_SDK_PYTHON_INTEGRATION_TEST_AWS_KMS_KEY_ID_2: >-
+      arn:aws:kms:eu-central-1:658956600833:key/75414c93-5285-4b57-99c9-30c1cf0a22c2
+
+phases:
+  install:
+    runtime-versions:
+      python: latest
+  build:
+    commands:
+      - cd /root/.pyenv/plugins/python-build/../.. && git pull && cd -
+      - pyenv install 3.12.0
+      - pyenv local 3.12.0
+      - pip install --upgrade pip
+      - pip install setuptools
+      - pip install "tox < 4.0"
+      - tox
diff --git a/codebuild/python3.7.yml b/codebuild/python3.7.yml
index 19a97151..6a51426a 100644
--- a/codebuild/python3.7.yml
+++ b/codebuild/python3.7.yml
@@ -11,22 +11,8 @@ env:
 phases:
   install:
     runtime-versions:
-        python: latest
+        python: 3.7
   build:
     commands:
-      # The specific versions are manually installed
-      # because they are not installed
-      # by default in CodeBuild containers.
-      # `pyenv` does not have
-      # a nice way to just install
-      # the latest patch version.
-      # I have selected the current latest patch
-      # rather than try
-      # and manage a one-liner or script.
-      # Testing every minor version
-      # is too extreme at this time.
-      # The choice of versions should be reviewed.
-      - pyenv install 3.7.12
-      - pyenv local 3.7.12
       - pip install "tox < 4.0"
       - tox
diff --git a/codebuild/python3.8.yml b/codebuild/python3.8.yml
index cc7a821d..478a3bfc 100644
--- a/codebuild/python3.8.yml
+++ b/codebuild/python3.8.yml
@@ -11,10 +11,8 @@ env:
 phases:
   install:
     runtime-versions:
-        python: latest
+        python: 3.8
   build:
     commands:
-      - pyenv install 3.8.12
-      - pyenv local 3.8.12
       - pip install "tox < 4.0"
       - tox
diff --git a/codebuild/python3.9.yml b/codebuild/python3.9.yml
index 8e5f609e..f572e2a9 100644
--- a/codebuild/python3.9.yml
+++ b/codebuild/python3.9.yml
@@ -11,10 +11,8 @@ env:
 phases:
   install:
     runtime-versions:
-        python: latest
+        python: 3.9
   build:
     commands:
-      - pyenv install 3.9.7
-      - pyenv local 3.9.7
       - pip install "tox < 4.0"
       - tox
diff --git a/dev_requirements/ci-requirements.txt b/dev_requirements/ci-requirements.txt
index 9a41a70d..b673eb36 100644
--- a/dev_requirements/ci-requirements.txt
+++ b/dev_requirements/ci-requirements.txt
@@ -1 +1,2 @@
+setuptools
 tox==3.24.5
diff --git a/tox.ini b/tox.ini
index 14dbc1e2..3c8733a2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{37,38,39,310,311}-{local,integ,ddb,examples}-fast,
+    py{37,38,39,310,311,312}-{local,integ,ddb,examples}-fast,
     nocmk, sourcebuildcheck,
     docs, bandit, doc8, readme,
     flake8{,-tests,-examples}, pylint{,-tests,-examples},