diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5262c83..6a24212 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,15 @@
 - Test staged binaries on Travis
 
 --------------------------------------------------------------------------------
+
+# 160 (2019-10-23)
+
+- Bugfix: Pipenv no longer installs twice in CI
+
+# 159 (2019-10-22)
+
+- Python 2.7.17 now available on Heroku 18 and 16.
+
 # 158 (2019-10-21)
 
 - Python 3.7.5 and 3.8.0 now available on Heroku 18 and 16.
diff --git a/README.md b/README.md
index ad7a654..e3ea62a 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ Supported runtime options include:
 
 - `python-3.7.4`
 - `python-3.6.9`
-- `python-2.7.16`
+- `python-2.7.17`
 
 ## Tests
 
diff --git a/bin/default_pythons b/bin/default_pythons
index ecc569c..16f044b 100755
--- a/bin/default_pythons
+++ b/bin/default_pythons
@@ -6,6 +6,6 @@ LATEST_37="python-3.7.5"
 LATEST_36="python-3.6.9"
 LATEST_35="python-3.5.7"
 LATEST_34="python-3.4.10"
-LATEST_27="python-2.7.16"
+LATEST_27="python-2.7.17"
 
 export DEFAULT_PYTHON_VERSION LATEST_38 LATEST_37 LATEST_36 LATEST_35 LATEST_34 LATEST_27
diff --git a/bin/steps/pipenv b/bin/steps/pipenv
index a84d549..c799c7d 100755
--- a/bin/steps/pipenv
+++ b/bin/steps/pipenv
@@ -60,10 +60,16 @@ if [ ! "$SKIP_PIPENV_INSTALL" ]; then
         # avoid this eager behavior.
         /app/.heroku/python/bin/pip install pipenv==$PIPENV_VERSION --upgrade --upgrade-strategy only-if-needed &> /dev/null
 
+        # Install the test dependencies, for CI.
+        if [ "$INSTALL_TEST" ]; then
+            puts-step "Installing test dependencies…"
+            /app/.heroku/python/bin/pipenv install --dev --system --deploy 2>&1 | cleanup | indent
+
         # Install the dependencies.
-        if [[ ! -f Pipfile.lock ]]; then
+        elif [[ ! -f Pipfile.lock ]]; then
             puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
             /app/.heroku/python/bin/pipenv install --system --skip-lock 2>&1 | indent
+
         else
             pipenv-to-pip Pipfile.lock > requirements.txt
             "$BIN_DIR/steps/pip-uninstall"
@@ -73,12 +79,6 @@ if [ ! "$SKIP_PIPENV_INSTALL" ]; then
             puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
             /app/.heroku/python/bin/pipenv install --system --deploy 2>&1 | indent
         fi
-
-        # Install the test dependencies, for CI.
-        if [ "$INSTALL_TEST" ]; then
-            puts-step "Installing test dependencies…"
-            /app/.heroku/python/bin/pipenv install --dev --system --deploy 2>&1 | cleanup | indent
-        fi
     fi
 else
     export SKIP_PIP_INSTALL=1
diff --git a/builds/runtimes/python-2.7.17 b/builds/runtimes/python-2.7.17
new file mode 100755
index 0000000..6dada70
--- /dev/null
+++ b/builds/runtimes/python-2.7.17
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
+export BIN_DIR
+
+# shellcheck source=bin/utils
+source "$BIN_DIR/steps/sqlite3"
+
+sqlite3_version
+echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
+sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
+
+echo "Building Python…"
+SOURCE_TARBALL='https://python.org/ftp/python/2.7.17/Python-2.7.17.tgz'
+curl -L $SOURCE_TARBALL | tar xz
+mv Python-2.7.17 src
+cd src
+
+./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
+make
+make install
+
+# Remove unneeded test directories, similar to the official Docker Python images:
+# https://github.com/docker-library/python
+find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
diff --git a/test/fixtures/python2/runtime.txt b/test/fixtures/python2/runtime.txt
index d42956d..b334cca 100644
--- a/test/fixtures/python2/runtime.txt
+++ b/test/fixtures/python2/runtime.txt
@@ -1 +1 @@
-python-2.7.16
+python-2.7.17