diff --git a/docs/testing.md b/docs/testing.md
index 49dcab06c3..1a9e482317 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -200,27 +200,3 @@ Firebug for Firefox is also pretty good. They both have profilers, but
 Chrome's is a sampling profiler while Firebug's is an instrumenting
 profiler. Using them both can be helpful because they provide different
 information.
-
-## Python 3 Compatibility
-
-Zulip is working on supporting Python 3, and all new code in Zulip
-should be Python 2+3 compatible. We have converted most of the codebase
-to be compatible with Python 3 using a suite of 2to3 conversion tools
-and some manual work. In order to avoid regressions in that
-compatibility as we continue to develop new features in Zulip, we have a
-special tool, `tools/check-py3`, which checks all code for Python 3
-syntactic compatibility by running a subset of the automated migration
-tools and checking if they trigger any changes. `tools/check-py3` is run
-automatically in Zulip's Travis CI tests (in the 'static-analysis'
-build) to avoid any regressions, but is not included in `test-all` since
-it is quite slow.
-
-To run `tools/check-py3`, you need to install the `modernize` and
-`future` Python packages (which are included in
-`requirements/py3k.txt`, which itself is included in
-`requirements/dev.txt`, so you probably already have these packages
-installed).
-
-To run `check-py3` on just the Python files in a particular directory, you
-can change the current working directory (e.g. `cd zerver/`) and run
-`check-py3` from there.
diff --git a/requirements/README.md b/requirements/README.md
index cc3e969f53..3e03e8b135 100644
--- a/requirements/README.md
+++ b/requirements/README.md
@@ -5,10 +5,10 @@ dev         prod
 + +          +
 | +->common<-+
 v
-mypy,docs,py3k
+mypy,docs
 ```
 
-Of the files, only dev, prod, py3k, and mypy have been used in the install
+Of the files, only dev, prod, and mypy have been used in the install
 scripts directly. The rest are implicit dependencies.
 
 common and dev are locked.
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 025045b0d8..0bfed248cc 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -4,8 +4,6 @@
 # moto s3 mock
 moto==1.0.1
 
--r py3k.txt
-
 # Needed for running tools/run-dev.py
 Twisted==17.5.0
 
diff --git a/requirements/dev_lock.txt b/requirements/dev_lock.txt
index e5e0ab00ab..829db21872 100644
--- a/requirements/dev_lock.txt
+++ b/requirements/dev_lock.txt
@@ -50,7 +50,7 @@ docopt==0.6.2
 docutils==0.14
 first==2.0.1
 fonttools==3.15.0
-future==0.16.0
+future==0.16.0            # via python-twitter
 gitdb==0.6.4
 gitlint==0.8.2
 google-api-python-client==1.6.2
@@ -72,7 +72,6 @@ markdown-include==0.5.1
 markdown==2.6.9           # via markdown-include
 markupsafe==1.0
 mock==2.0.0
-modernize==0.5
 moto==1.0.1
 ndg-httpsclient==0.4.2
 oauth2client==4.1.2
diff --git a/requirements/py3k.txt b/requirements/py3k.txt
deleted file mode 100644
index cadd048fb9..0000000000
--- a/requirements/py3k.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-six==1.10.0
-typing==3.6.2
-future==0.16.0
-modernize==0.5
diff --git a/tools/check-py3 b/tools/check-py3
deleted file mode 100755
index be21c31aec..0000000000
--- a/tools/check-py3
+++ /dev/null
@@ -1,134 +0,0 @@
-#!/bin/bash
-set -e
-fixers="
-lib2to3.fixes.fix_apply
-lib2to3.fixes.fix_except
-lib2to3.fixes.fix_exitfunc
-lib2to3.fixes.fix_funcattrs
-lib2to3.fixes.fix_has_key
-lib2to3.fixes.fix_idioms
-lib2to3.fixes.fix_intern
-lib2to3.fixes.fix_isinstance
-lib2to3.fixes.fix_methodattrs
-lib2to3.fixes.fix_ne
-lib2to3.fixes.fix_numliterals
-lib2to3.fixes.fix_paren
-lib2to3.fixes.fix_reduce
-lib2to3.fixes.fix_renames
-lib2to3.fixes.fix_repr
-lib2to3.fixes.fix_standarderror
-lib2to3.fixes.fix_sys_exc
-lib2to3.fixes.fix_throw
-lib2to3.fixes.fix_tuple_params
-lib2to3.fixes.fix_types
-lib2to3.fixes.fix_ws_comma
-lib2to3.fixes.fix_xreadlines
-libfuturize.fixes.fix_absolute_import
-libfuturize.fixes.fix_future_standard_library_urllib
-libfuturize.fixes.fix_next_call
-libfuturize.fixes.fix_print_with_import
-libfuturize.fixes.fix_raise
-libmodernize.fixes.fix_basestring
-libfuturize.fixes.fix_division_safe
-libmodernize.fixes.fix_file
-libmodernize.fixes.fix_filter
-libmodernize.fixes.fix_imports_six
-libmodernize.fixes.fix_input_six
-libmodernize.fixes.fix_int_long_tuple
-libmodernize.fixes.fix_map
-libmodernize.fixes.fix_raise_six
-libmodernize.fixes.fix_xrange_six
-libmodernize.fixes.fix_zip
-libmodernize.fixes.fix_unicode_type
-libpasteurize.fixes.fix_newstyle
-"
-
-echo; echo "Testing for additions of Python 2 patterns we've removed as part of moving towards Python 3 compatibility."; echo
-
-if [ -n "$(git status --porcelain)" ]; then
-    echo "The repository is not clean. check-py3 can only be run if the repository is clean."
-    echo "Displaying output from 'git status --porcelain' to help debug"
-    git status --porcelain
-    exit 1
-fi
-
-script_dir=$(dirname "$0")
-lister_path="$script_dir/lister.py"
-python_files="$($lister_path -f py)"
-
-if [ -z "$python_files" ]; then
-    echo "There are no python files to check in the current directory."
-    exit 0
-fi
-
-quick=1
-if [ "$1" == "--find-fixers" ]; then
-    quick=0
-fi
-
-fixer_options=""
-for fixer in $fixers; do
-    fixer_options+="-f $fixer "
-done
-
-failed=0
-# run quick check
-echo "Running quick Python 3 compatibility test"
-echo "$python_files" | xargs futurize $fixer_options -j4 -n -w >/dev/null 2>/dev/null
-if ! git diff --exit-code; then
-    # Clear the output from this one
-    git reset --hard >/dev/null
-    failed=1
-fi
-
-# run slow check
-if [ "$failed" = "1" -a "$quick" == "0" ]; then
-    echo "Running each fixer separately to find out which fixers need to be applied"
-    for fixer in $fixers; do
-        echo "Running Python 3 compatibility test $fixer"
-        echo "$python_files" | xargs futurize -f $fixer -j4 -n -w >/dev/null 2>/dev/null
-        if ! git diff --exit-code; then
-            # Clear the output from this one
-            git reset --hard >/dev/null
-        fi
-    done
-fi
-
-# The dict fixer tries to add list() even in for loops over an
-# iterator where it's just counterproductive.  To address this, we run
-# the fixer but check for lines which don't include code that works
-# with iterators (currently for, join, and from_iterable).
-fixer="libmodernize.fixes.fix_dict_six"
-echo "Running python 3 compatability test $fixer"
-echo "$python_files" | xargs python-modernize -f $fixer -j4 -n -w >/dev/null 2>/dev/null
-if git --no-pager diff | grep "^+ " | grep -v '[ ]*for' | grep -v [.]join | grep -v from_iterable; then
-    echo
-    echo "Error: the above are changes suggested by python-modernize "
-    echo "to handle the list=>iterator transition in Python 3."
-    echo "Because 'python-modernize -f libmodernize.fixes.fix_dict_six' is spammy "
-    echo "and also changes places where an iterator works fine, this output "
-    echo "does not display the full context; you can find the diff with context by "
-    echo "searching through the (unfortunately very spammy) full output below:"
-    echo
-    git --no-pager diff
-    echo
-    echo "That was a lot of text!  Read this output from the top for more readable details."
-    failed=1
-fi
-# Clear the output
-git reset --hard >/dev/null
-
-if git grep -q '\(^\W*import StringIO\|^\W*from StringIO\)'; then
-    echo "ERROR: StringIO imports not compatible with python 2+3:"
-    git grep '\(^\W*import StringIO\|^\W*from StringIO\)'
-    echo "Please use 'from six.moves import cStringIO as StringIO'"
-    failed=1
-fi
-
-echo
-if [ "$failed" == "0" ]; then
-    echo "No issues detected!"
-else
-    echo "Python 3 compatibility error(s) detected!  See diffs above for what you need to change."
-    exit 1
-fi
diff --git a/tools/test-all b/tools/test-all
index 71839057b0..c0be794743 100755
--- a/tools/test-all
+++ b/tools/test-all
@@ -36,8 +36,6 @@ run ./tools/clean-repo
 
 # travis/static-analysis
 run ./tools/run-mypy
-# Not running check-py3 because it demands a clean Git worktree.
-# run ./tools/check-py3
 
 # travis/backend
 run ./tools/lint --pep8 $FORCEARG
diff --git a/tools/travis/setup-static-analysis b/tools/travis/setup-static-analysis
index 347f100a47..3903dee782 100755
--- a/tools/travis/setup-static-analysis
+++ b/tools/travis/setup-static-analysis
@@ -2,15 +2,10 @@
 set -e
 set -x
 
-# We only need mypy and the python 3 compatibility checkers in this
-# build, so we just install those directly, skipping provision.
+# We only need the mypy checker in this build, so we just install that
+# directly, skipping provision.
 
 if ! pip install --no-deps -r requirements/mypy.txt; then
     echo "\`pip install --no-deps -r requirements/mypy.txt\`: Failure occured while trying to perform dependancy installation, Retrying..."
     pip install --no-deps -r requirements/mypy.txt
 fi
-
-if ! pip install --no-deps -r requirements/py3k.txt; then
-    echo "\`pip install --no-deps -r requirements/py3k.txt\`: Failure occured while trying to perform dependancy installation, Retrying..."
-    pip install --no-deps -r requirements/py3k.txt
-fi
diff --git a/tools/travis/static-analysis b/tools/travis/static-analysis
index 0f64d6b7fb..f5eb579b08 100755
--- a/tools/travis/static-analysis
+++ b/tools/travis/static-analysis
@@ -18,8 +18,6 @@ else
 fi
 set -x
 
-tools/check-py3
-
 # NB: Everything here should be in `tools/test-all`.  If there's a
 # reason not to run it there, it should be there as a comment
 # explaining why.