use latest, to debug

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

bin/steps/pipenv

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
 export CLINT_FORCE_COLOR=1
+export PIPENV_FORCE_COLOR=1
+
 
 # Pipenv support (Generate requriements.txt with pipenv).
 if [[ -f Pipfile ]]; then
@@ -8,7 +10,7 @@ if [[ -f Pipfile ]]; then
         puts-step "Installing requirements with latest Pipenv..."
 
         # Install pipenv.
-        /app/.heroku/python/bin/pip install pipenv --upgrade &> /dev/null
+        /app/.heroku/python/bin/pip install git+https://github.com/kennethreitz/pipenv.git#egg=pipenv --upgrade &> /dev/null
 
         if [[ ! -f Pipfile.lock ]]; then
             bash -c "/app/.heroku/python/bin/pipenv install --system --skip-lock" 2>&1 | indent