diff --git a/.travis.yml b/.travis.yml
index 76e701599..a32bd2c92 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,10 @@
 language: python
 python:
   - "2.7"
+  - "3.3"
+  - "3.4"
 install:
   - pip install -r requirements.txt
-  - pip install LinkChecker
   - gem install jekyll-gist -v '1.2.1'
   - gem install jekyll
   - gem install jekyll-sitemap
@@ -11,6 +12,7 @@ install:
   - gem install compass --version 0.12.5
   - gem install kramdown
   - gem install travis
+  - gem install link-checker
 before_script:
   - travis lint -x --skip-completion-check
   - python scripts/insert_demo.py
@@ -20,9 +22,9 @@ script:
   - jekyll build
   - s3_website push
   - cd ..
-  - linkchecker 'http://prose.lifelinter.com'
   - pep8 .
   - pep257 . --match='.*\.py'
+  - check-links "http://prose.lifelinter.com"
 after_success:
   - coveralls
 env:
diff --git a/futurizing_output.txt b/futurizing_output.txt
new file mode 100644
index 000000000..b9965240f
--- /dev/null
+++ b/futurizing_output.txt
@@ -0,0 +1,31 @@
+--- ./proselint/command_line.py	(original)
++++ ./proselint/command_line.py	(refactored)
+@@ -59,7 +59,7 @@
+     # Extract the checks.
+     sys.path.append(proselint_path)
+     checks = []
+-    check_names = [key for (key, val) in options["checks"].items() if val]
++    check_names = [key for (key, val) in list(options["checks"].items()) if val]
+     for check_name in check_names:
+         module = importlib.import_module("checks." + check_name)
+         for d in dir(module):
+@@ -140,7 +140,7 @@
+             input_val = None
+             while not isinstance(input_val, int):
+                 try:
+-                    input_val = input("# of false alarms? ")
++                    input_val = eval(input("# of false alarms? "))
+                     if input_val == "exit":
+                         return
+                     else:
+--- ./proselint/tools.py	(original)
++++ ./proselint/tools.py	(refactored)
+@@ -44,7 +44,7 @@
+ 
+         tempargdict = inspect.getcallargs(f, *args, **kwargs)
+ 
+-        for item in tempargdict.items():
++        for item in list(tempargdict.items()):
+             signature += item[1].encode('utf-8')
+ 
+         key = hashlib.sha256(signature).hexdigest()
diff --git a/proselint/command_line.py b/proselint/command_line.py
index 41f5cc816..0c59483bf 100644
--- a/proselint/command_line.py
+++ b/proselint/command_line.py
@@ -2,11 +2,17 @@
 # -*- coding: utf-8 -*-
 
 """Command line utility for proselint."""
+from __future__ import print_function
+from __future__ import absolute_import
+from builtins import input
+from builtins import str
+from builtins import int
+
 
 import click
 import os
-from tools import line_and_column, is_quoted
-import checks as pl
+from .tools import line_and_column, is_quoted
+from . import checks as pl
 import pkgutil
 import codecs
 import subprocess
@@ -53,7 +59,7 @@ def lint(path, debug=False):
     # Extract the checks.
     sys.path.append(proselint_path)
     checks = []
-    check_names = [key for key, val in options["checks"].items() if val]
+    check_names = [key for (key, val) in options["checks"].items() if val]
     for check_name in check_names:
         module = importlib.import_module("checks." + check_name)
         for d in dir(module):
@@ -131,16 +137,16 @@ def lintscore():
             subprocess.call("{} {}".format("open", fullpath), shell=True)
 
             # Ask the scorer how many of the errors were false alarms?
-            input = None
-            while not isinstance(input, (int, long)):
+            input_val = None
+            while not isinstance(input_val, int):
                 try:
-                    input = raw_input("# of false alarms? ")
-                    if input == "exit":
+                    input_val = input("# of false alarms? ")
+                    if input_val == "exit":
                         return
                     else:
-                        input = int(input)
-                        fp += input
-                        tp += (num_errors - input)
+                        input_val = int(input_val)
+                        fp += input_val
+                        tp += (num_errors - input_val)
                 except:
                     pass
 
diff --git a/proselint/tools.py b/proselint/tools.py
index b8d8729f4..d9d04297b 100644
--- a/proselint/tools.py
+++ b/proselint/tools.py
@@ -2,6 +2,8 @@
 # -*- coding: utf-8 -*-
 
 """General-purpose tools shared across linting checks."""
+from __future__ import print_function
+from __future__ import unicode_literals
 import os
 import shelve
 import inspect
@@ -37,12 +39,12 @@ def wrapped(*args, **kwargs):
         if hasattr(f, '__self__'):
             args = args[1:]
 
-        signature = f.__module__ + '.' + f.__name__
+        signature = (f.__module__ + '.' + f.__name__).encode("utf-8")
 
         tempargdict = inspect.getcallargs(f, *args, **kwargs)
 
         for item in tempargdict.items():
-            signature += item[1].encode('utf-8')
+            signature += item[1].encode("utf-8")
 
         key = hashlib.sha256(signature).hexdigest()
 
@@ -126,16 +128,17 @@ def preferred_forms_check(text, list, err, msg, ignore_case=True, offset=0):
     return errors
 
 
-def existence_check(text, list, err, msg, ignore_case=True, unicode=False,
-                    max_errors=float("inf"), offset=0, require_padding=True,
-                    dotall=False, excluded_topics=None, join=False):
+def existence_check(text, list, err, msg, ignore_case=True,
+                    str=False, max_errors=float("inf"), offset=0,
+                    require_padding=True, dotall=False,
+                    excluded_topics=None, join=False):
     """Build a checker that blacklists certain words."""
     flags = 0
 
     if ignore_case:
         flags = flags | re.IGNORECASE
 
-    if unicode:
+    if str:
         flags = flags | re.UNICODE
 
     if dotall:
@@ -182,8 +185,8 @@ def existence_check(text, list, err, msg, ignore_case=True, unicode=False,
 def is_quoted(position, text):
     """Determine if the position in the text falls within a quote."""
     def matching(quotemark1, quotemark2):
-        straight = u'\"\''
-        curly = u'“”'
+        straight = '\"\''
+        curly = '“”'
         if quotemark1 in straight and quotemark2 in straight:
             return True
         if quotemark1 in curly and quotemark2 in curly:
@@ -197,7 +200,7 @@ def find_ranges(text):
         start = None
         ranges = []
         seps = " .,:;-\r\n"
-        quotes = [u'\"', u'“', u'”', u"'"]
+        quotes = ['\"', '“', '”', "'"]
         for i, c in enumerate(text + "\n"):
             if s == 0 and c in quotes and pc in seps:
                 start = i
diff --git a/requirements.txt b/requirements.txt
index eb1c4bc9a..2691a5d81 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,7 @@ Flask-API==0.6.2
 Flask-Cors==2.0.0
 Flask-Limiter==0.8
 Flask==0.10.1
+future
 gunicorn==19.3.0
 itsdangerous==0.24
 Jinja2==2.7.3
diff --git a/scripts/generate_posts.py b/scripts/generate_posts.py
index 4e1d879e0..fd8468981 100755
--- a/scripts/generate_posts.py
+++ b/scripts/generate_posts.py
@@ -1,5 +1,7 @@
 """Generate blog posts from check docstrings."""
 
+from builtins import str
+from builtins import range
 import os
 import ast
 import datetime
@@ -37,7 +39,7 @@ def is_check(fn):
                 str(datetime.date.today()) + "-" + docstring[0:6] + ".md")
 
             # Chop off the first two lines
-            for i in xrange(2):
+            for i in range(2):
                 docstring = '\n'.join(docstring.split('\n')[1:])
 
             # Create a new post in the blog.
diff --git a/scripts/insert_demo.py b/scripts/insert_demo.py
index af42ceb58..b50f5377e 100755
--- a/scripts/insert_demo.py
+++ b/scripts/insert_demo.py
@@ -1,4 +1,5 @@
 """Insert the demo into the codemirror site."""
+from __future__ import print_function
 
 import os
 import fileinput
@@ -26,6 +27,6 @@
         os.path.join(live_write_path, "index.html"), inplace=True):
 
     if "##DEMO_PLACEHOLDER##" in line:
-        print demo,
+        print(demo, end=' ')
     else:
-        print line,
+        print(line, end=' ')
diff --git a/tests/_test_mau_a_vs_an.py b/tests/_test_mau_a_vs_an.py
index 957708209..6460d39ac 100644
--- a/tests/_test_mau_a_vs_an.py
+++ b/tests/_test_mau_a_vs_an.py
@@ -1,6 +1,7 @@
 """Unit tests for MAU101."""
+from __future__ import absolute_import
 
-from check import Check
+from .check import Check
 from proselint.checks.garner import a_vs_an as chk
 
 
diff --git a/tests/check.py b/tests/check.py
index 93eca9b6b..b77167560 100644
--- a/tests/check.py
+++ b/tests/check.py
@@ -1,5 +1,6 @@
 """Check that a check is working."""
 
+from past.builtins import basestring
 from unittest import TestCase
 import os
 import codecs
diff --git a/tests/test_dfw_uncomparables.py b/tests/test_dfw_uncomparables.py
index 56c4c6670..9446bc3b4 100644
--- a/tests/test_dfw_uncomparables.py
+++ b/tests/test_dfw_uncomparables.py
@@ -1,6 +1,7 @@
 """Test dfw.uncomparables."""
+from __future__ import absolute_import
 
-from check import Check
+from .check import Check
 from proselint.checks.wallace import uncomparables as chk
 
 
diff --git a/tests/test_garner_dates.py b/tests/test_garner_dates.py
index 5539bd383..e9ee913ee 100644
--- a/tests/test_garner_dates.py
+++ b/tests/test_garner_dates.py
@@ -1,6 +1,7 @@
 """Test garner.dates."""
+from __future__ import absolute_import
 
-from check import Check
+from .check import Check
 from proselint.checks.garner import dates
 
 
diff --git a/tests/test_strunk_white_eos.py b/tests/test_strunk_white_eos.py
index 98a56a539..54e089fae 100644
--- a/tests/test_strunk_white_eos.py
+++ b/tests/test_strunk_white_eos.py
@@ -1,6 +1,8 @@
 """Unit tests for strunk_white_eos."""
+# from __future__ import absolute_import
 
-# from check import Check
+
+# from .check import Check
 # from proselint.checks.strunkwhite import elementary_composition as chk