diff --git a/.travis.yml b/.travis.yml
index 766a2a7..202755b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,30 +24,6 @@
         "env": "BUILD=style",
         "python": "3.6"
       },
-      {
-        "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel ",
-        "python": "3.3"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=devel ",
-        "python": "3.3"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=release ",
-        "python": "3.3"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=release ",
-        "python": "3.3"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=minimal ",
-        "python": "3.3"
-      },
-      {
-        "env": "BUILD=test DAV_SERVER=xandikos REQUIREMENTS=minimal ",
-        "python": "3.3"
-      },
       {
         "env": "BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel ",
         "python": "3.4"
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index e5f1adf..73e733b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,7 @@ Version 0.16.3
 
 - First version with custom Debian and Ubuntu packages. See :gh:`663`.
 - Remove invalid ASCII control characters from server responses. See :gh:`626`.
+- **packagers:** Python 3.3 is no longer supported. See :ghpr:`674`.
 
 Version 0.16.2
 ==============
diff --git a/Makefile b/Makefile
index c70c618..638b5cf 100644
--- a/Makefile
+++ b/Makefile
@@ -72,7 +72,6 @@ install-servers:
 	done
 
 install-test: install-servers
-	(python --version | grep -vq 'Python 3.3') || pip install enum34
 	pip install -r test-requirements.txt
 	set -xe && if [ "$$REQUIREMENTS" = "devel" ]; then \
 		pip install -U --force-reinstall \
diff --git a/docs/installation.rst b/docs/installation.rst
index fb239fc..0223aef 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -41,7 +41,7 @@ If your distribution doesn't provide a package for vdirsyncer, you still can
 use Python's package manager "pip". First, you'll have to check that the
 following things are installed:
 
-- Python 3.3+ and pip.
+- Python 3.4+ and pip.
 - ``libxml`` and ``libxslt``
 - ``zlib``
 - Linux or OS X. **Windows is not supported, see :gh:`535`.**
diff --git a/scripts/make_travisconf.py b/scripts/make_travisconf.py
index be192e6..fe058cb 100644
--- a/scripts/make_travisconf.py
+++ b/scripts/make_travisconf.py
@@ -2,7 +2,7 @@ import itertools
 import json
 import sys
 
-python_versions = ("3.3", "3.4", "3.5", "3.6")
+python_versions = ("3.4", "3.5", "3.6")
 latest_python = "3.6"
 
 cfg = {}
diff --git a/setup.py b/setup.py
index 8b2d582..b033ce9 100644
--- a/setup.py
+++ b/setup.py
@@ -95,7 +95,6 @@ setup(
         'License :: OSI Approved :: BSD License',
         'Operating System :: POSIX',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
diff --git a/tests/unit/sync/test_status.py b/tests/unit/sync/test_status.py
index 06ecf34..b5fc912 100644
--- a/tests/unit/sync/test_status.py
+++ b/tests/unit/sync/test_status.py
@@ -3,7 +3,6 @@ import pytest
 from hypothesis import assume, given
 import hypothesis.strategies as st
 
-from vdirsyncer.sync.exceptions import IdentAlreadyExists
 from vdirsyncer.sync.status import SqliteStatus
 
 
diff --git a/vdirsyncer/__init__.py b/vdirsyncer/__init__.py
index f6ff806..abe51ed 100644
--- a/vdirsyncer/__init__.py
+++ b/vdirsyncer/__init__.py
@@ -21,8 +21,8 @@ except ImportError:  # pragma: no cover
 
 def _check_python_version():  # pragma: no cover
     import sys
-    if sys.version_info < (3, 3, 0):
-        print('vdirsyncer requires at least Python 3.3.')
+    if sys.version_info < (3, 4, 0):
+        print('vdirsyncer requires at least Python 3.4.')
         sys.exit(1)