diff --git a/.travis.yml b/.travis.yml
index 86702c536..cf290d719 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,19 +15,6 @@ matrix:
     - python: 2.7
       env: TOXENV=py27-examples
       stage: Client Tests
-    # CPython 3.4
-    - python: 3.4
-      env: TOXENV=py34-local
-      stage: Client Tests
-    - python: 3.4
-      env: TOXENV=py34-integ
-      stage: Client Tests
-    - python: 3.4
-      env: TOXENV=py34-accept
-      stage: Client Tests
-    - python: 3.4
-      env: TOXENV=py34-examples
-      stage: Client Tests
     # CPython 3.5
     - python: 3.5
       env: TOXENV=py35-local
@@ -77,6 +64,29 @@ matrix:
       dist: xenial
       sudo: true
       stage: Client Tests
+    # CPython 3.8
+    # xenial + sudo are currently needed to get 3.8
+    # https://github.com/travis-ci/travis-ci/issues/9815
+    - python: 3.8
+      env: TOXENV=py38-local
+      dist: xenial
+      sudo: true
+      stage: Client Tests
+    - python: 3.8
+      env: TOXENV=py38-integ
+      dist: xenial
+      sudo: true
+      stage: Client Tests
+    - python: 3.8
+      env: TOXENV=py38-accept
+      dist: xenial
+      sudo: true
+      stage: Client Tests
+    - python: 3.8
+      env: TOXENV=py38-examples
+      dist: xenial
+      sudo: true
+      stage: Client Tests
     # Upstream tests
     - python: 3.6
       env: TOXENV=nocmk
@@ -148,22 +158,6 @@ matrix:
         TEST_VECTOR_HANDLERS=1
         TOXENV=py27-awses_latest
       stage: Test Vector Handler Tests
-    # CPython 3.4
-    - python: 3.4
-      env:
-        TEST_VECTOR_HANDLERS=1
-        TOXENV=py34-awses_1.3.3
-      stage: Test Vector Handler Tests
-    - python: 3.4
-      env:
-        TEST_VECTOR_HANDLERS=1
-        TOXENV=py34-awses_1.3.max
-      stage: Test Vector Handler Tests
-    - python: 3.4
-      env:
-        TEST_VECTOR_HANDLERS=1
-        TOXENV=py34-awses_latest
-      stage: Test Vector Handler Tests
     # CPython 3.5
     - python: 3.5
       env:
@@ -218,6 +212,28 @@ matrix:
       dist: xenial
       sudo: true
       stage: Test Vector Handler Tests
+    # CPython 3.8
+    - python: 3.8
+      env:
+        TEST_VECTOR_HANDLERS=1
+        TOXENV=py38-awses_1.3.3
+      dist: xenial
+      sudo: true
+      stage: Test Vector Handler Tests
+    - python: 3.8
+      env:
+        TEST_VECTOR_HANDLERS=1
+        TOXENV=py38-awses_1.3.max
+      dist: xenial
+      sudo: true
+      stage: Test Vector Handler Tests
+    - python: 3.8
+      env:
+        TEST_VECTOR_HANDLERS=1
+        TOXENV=py38-awses_latest
+      dist: xenial
+      sudo: true
+      stage: Test Vector Handler Tests
     # Linters
     - python: 3.6
       env:
diff --git a/README.rst b/README.rst
index 092b3b109..ae373f8e3 100644
--- a/README.rst
+++ b/README.rst
@@ -36,7 +36,7 @@ Getting Started
 Required Prerequisites
 ======================
 
-* Python 2.7+ or 3.4+
+* Python 2.7+ or 3.5+
 * cryptography >= 1.8.1
 * boto3
 * attrs
diff --git a/appveyor.yml b/appveyor.yml
index cfb4bdcdb..ceb9318bd 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,28 +24,6 @@ environment:
     - 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"
@@ -100,6 +78,24 @@ environment:
     - PYTHON: "C:\\Python37-x64"
       TOXENV: "py37-examples"
 
+    # Python 3.8
+    - PYTHON: "C:\\Python38"
+      TOXENV: "py38-local"
+    - PYTHON: "C:\\Python38"
+      TOXENV: "py38-integ"
+    - PYTHON: "C:\\Python38"
+      TOXENV: "py38-accept"
+    - PYTHON: "C:\\Python38"
+      TOXENV: "py38-examples"
+    - PYTHON: "C:\\Python38-x64"
+      TOXENV: "py38-local"
+    - PYTHON: "C:\\Python38-x64"
+      TOXENV: "py38-integ"
+    - PYTHON: "C:\\Python38-x64"
+      TOXENV: "py38-accept"
+    - PYTHON: "C:\\Python38-x64"
+      TOXENV: "py38-examples"
+
 install:
   # Prepend newly installed Python to the PATH of this build
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
diff --git a/setup.py b/setup.py
index 6ceb2d8fb..52ef4ff7f 100644
--- a/setup.py
+++ b/setup.py
@@ -48,10 +48,10 @@ def get_requirements():
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Security",
         "Topic :: Security :: Cryptography",
diff --git a/test_vector_handlers/README.rst b/test_vector_handlers/README.rst
index a2d188dd6..b1d10c2c5 100644
--- a/test_vector_handlers/README.rst
+++ b/test_vector_handlers/README.rst
@@ -12,7 +12,7 @@ Getting Started
 Required Prerequisites
 ======================
 
-* Python 2.7 or 3.4+
+* Python 2.7 or 3.5+
 * aws-encryption-sdk
 
 Use
diff --git a/test_vector_handlers/setup.py b/test_vector_handlers/setup.py
index bd16c76c8..c7ad742ad 100644
--- a/test_vector_handlers/setup.py
+++ b/test_vector_handlers/setup.py
@@ -48,10 +48,10 @@ def get_requirements():
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: CPython",
         "Topic :: Security",
         "Topic :: Security :: Cryptography",
diff --git a/test_vector_handlers/tox.ini b/test_vector_handlers/tox.ini
index fc2c8d5a7..d62bc38ea 100644
--- a/test_vector_handlers/tox.ini
+++ b/test_vector_handlers/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{27,34,35,36,37}-awses_{1.3.3,1.3.max,latest},
+    py{27,35,36,37,38}-awses_{1.3.3,1.3.max,latest},
     # 1.2.0 and 1.2.max are being difficult because of attrs
     bandit, doc8, readme, docs,
     {flake8,pylint}{,-tests},
diff --git a/tox.ini b/tox.ini
index 06564ef6a..1df161ccd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{27,34,35,36,37}-{local,integ,accept,examples}, nocmk,
+    py{27,35,36,37,38}-{local,integ,accept,examples}, nocmk,
     bandit, doc8, readme, docs,
     {flake8,pylint}{,-tests,-examples},
     isort-check, black-check,