diff --git a/pipenv/vendor/pythonfinder/__init__.py b/pipenv/vendor/pythonfinder/__init__.py
index 8059cda5..eb3d0363 100644
--- a/pipenv/vendor/pythonfinder/__init__.py
+++ b/pipenv/vendor/pythonfinder/__init__.py
@@ -1,7 +1,8 @@
 from __future__ import print_function, absolute_import
 
-__version__ = "0.1.2"
+__version__ = "0.1.4.dev0"
 
-__all__ = ["Finder", "WindowsFinder", "SystemPath"]
+__all__ = ["Finder", "WindowsFinder", "SystemPath", "InvalidPythonVersion"]
 from .pythonfinder import Finder
 from .models import SystemPath, WindowsFinder
+from .exceptions import InvalidPythonVersion
diff --git a/pipenv/vendor/pythonfinder/_vendor/Makefile b/pipenv/vendor/pythonfinder/_vendor/Makefile
new file mode 100644
index 00000000..5c44fea4
--- /dev/null
+++ b/pipenv/vendor/pythonfinder/_vendor/Makefile
@@ -0,0 +1,14 @@
+# Taken from pip: https://github.com/pypa/pip/blob/95bcf8c5f6394298035a7332c441868f3b0169f4/src/pip/_vendor/Makefile
+all: clean vendor
+
+clean:
+	@# Delete vendored items
+	find . -maxdepth 1 -mindepth 1 -type d -exec rm -rf {} \;
+
+vendor:
+	@# Install vendored libraries
+	pip install -t . -r vendor.txt
+
+	@# Cleanup .egg-info directories
+	rm -rf *.egg-info
+	rm -rf *.dist-info
diff --git a/pipenv/vendor/pythonfinder/_vendor/vendor.txt b/pipenv/vendor/pythonfinder/_vendor/vendor.txt
new file mode 100644
index 00000000..88752498
--- /dev/null
+++ b/pipenv/vendor/pythonfinder/_vendor/vendor.txt
@@ -0,0 +1 @@
+-e git+https://github.com/zooba/pep514tools.git@320e48745660b696e2dcaee888fc2e516b435e48#egg=pep514tools
diff --git a/pipenv/vendor/pythonfinder/cli.py b/pipenv/vendor/pythonfinder/cli.py
index 2bb80f3d..4e620b08 100644
--- a/pipenv/vendor/pythonfinder/cli.py
+++ b/pipenv/vendor/pythonfinder/cli.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # -*- coding=utf-8 -*-
-
+from __future__ import print_function, absolute_import
 import click
 import crayons
 import sys
diff --git a/pipenv/vendor/pythonfinder/environment.py b/pipenv/vendor/pythonfinder/environment.py
index 3f82ba10..2cdb5fd9 100644
--- a/pipenv/vendor/pythonfinder/environment.py
+++ b/pipenv/vendor/pythonfinder/environment.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import os
 import platform
 import sys
diff --git a/pipenv/vendor/pythonfinder/exceptions.py b/pipenv/vendor/pythonfinder/exceptions.py
new file mode 100644
index 00000000..13e56e2c
--- /dev/null
+++ b/pipenv/vendor/pythonfinder/exceptions.py
@@ -0,0 +1,7 @@
+# -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
+
+
+class InvalidPythonVersion(Exception):
+    """Raised when parsing an invalid python version"""
+    pass
diff --git a/pipenv/vendor/pythonfinder/models/__init__.py b/pipenv/vendor/pythonfinder/models/__init__.py
index beaef790..e455ffb0 100644
--- a/pipenv/vendor/pythonfinder/models/__init__.py
+++ b/pipenv/vendor/pythonfinder/models/__init__.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import abc
 import operator
 import six
@@ -33,16 +34,13 @@ class BasePath(object):
         :returns: :class:`~pythonfinder.models.PathEntry` instance.
         """
 
-        valid_names = [
+        valid_names = [name] + [
             "{0}.{1}".format(name, ext).lower() if ext else "{0}".format(name).lower()
             for ext in KNOWN_EXTS
         ]
-        finder = filter(operator.attrgetter("is_executable"), self.children.values())
-        name_getter = operator.attrgetter("path.name")
-        return next(
-            (child for child in finder if name_getter(child).lower() in valid_names),
-            None,
-        )
+        children = self.children
+        found = next((children[(self.path / child).as_posix()] for child in valid_names if (self.path / child).as_posix() in children), None)
+        return found
 
     def find_python_version(self, major, minor=None, patch=None, pre=None, dev=None):
         """Search or self for the specified Python version and return the first match.
@@ -62,16 +60,16 @@ class BasePath(object):
         is_py = operator.attrgetter("is_python")
         py_version = operator.attrgetter("as_python")
         if not self.is_dir:
-            if self.is_python:
-                return self if version_matcher(self.as_python) else None
+            if self.is_python and self.as_python.matches(major, minor=minor, patch=patch, pre=pre, dev=dev):
+                return self
             return
-        finder = (c for c in self.children.values() if is_py(c) and py_version(c))
+        finder = ((child, child.as_python) for child in self.children.values() if child.is_python and child.as_python)
         py_filter = filter(
-            None, filter(lambda c: version_matcher(py_version(c)), finder)
+            None, filter(lambda child: version_matcher(child[1]), finder)
         )
-        version_sort = operator.attrgetter("py_version.version")
+        version_sort = operator.attrgetter("version")
         return next(
-            (c for c in sorted(py_filter, key=version_sort, reverse=True)), None
+            (c[0] for c in sorted(py_filter, key=lambda child: child[1].version, reverse=True)), None
         )
 
 
diff --git a/pipenv/vendor/pythonfinder/models/path.py b/pipenv/vendor/pythonfinder/models/path.py
index e9d460e7..2c6ea950 100644
--- a/pipenv/vendor/pythonfinder/models/path.py
+++ b/pipenv/vendor/pythonfinder/models/path.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import attr
 import operator
 import os
@@ -7,12 +8,14 @@ from collections import defaultdict
 from . import BasePath
 from .python import PythonVersion
 from ..environment import PYENV_INSTALLED, PYENV_ROOT
+from ..exceptions import InvalidPythonVersion
 from ..utils import (
     optional_instance_of,
     filter_pythons,
     path_is_known_executable,
     is_python_name,
     ensure_path,
+    fs_str
 )
 
 try:
@@ -50,7 +53,7 @@ class SystemPath(object):
         for p in self.python_executables:
             try:
                 version_object = PythonVersion.from_path(p)
-            except ValueError:
+            except (ValueError, InvalidPythonVersion):
                 continue
             version_dict[version_object.version_tuple].append(version_object)
         return version_dict
@@ -64,11 +67,11 @@ class SystemPath(object):
         if PYENV_INSTALLED:
             self._setup_pyenv()
         venv = os.environ.get('VIRTUAL_ENV')
+        if os.name == 'nt':
+            bin_dir = 'Scripts'
+        else:
+            bin_dir = 'bin'
         if venv:
-            if os.name == 'nt':
-                bin_dir = 'Scripts'
-            else:
-                bin_dir = 'bin'
             p = Path(venv)
             self.path_order = [(p / bin_dir).as_posix()] + self.path_order
             self.paths[p] = PathEntry.create(
@@ -76,9 +79,12 @@ class SystemPath(object):
             )
         if self.system:
             syspath = Path(sys.executable)
-            self.path_order = [syspath.parent.as_posix()] + self.path_order
-            self.paths[syspath.parent.as_posix()] = PathEntry.create(
-                path=syspath.parent, is_root=True, only_python=True
+            syspath_bin = syspath.parent
+            if syspath_bin.name != bin_dir and syspath_bin.joinpath(bin_dir).exists():
+                syspath_bin = syspath_bin / bin_dir
+            self.path_order = [syspath_bin.as_posix()] + self.path_order
+            self.paths[syspath_bin.as_posix()] = PathEntry.create(
+                path=syspath_bin, is_root=True, only_python=False
             )
 
     def _setup_pyenv(self):
@@ -111,12 +117,24 @@ class SystemPath(object):
         self.paths.update({p.path: p for p in root_paths})
 
     def get_path(self, path):
-        _path = self.paths.get(path)
-        if not _path and path in self.path_order:
-            self.paths[path] = PathEntry.create(
-                path=path, is_root=True, only_python=self.only_python
+        path = Path(path)
+        _path = self.paths.get(path.as_posix())
+        if not _path and path.as_posix() in self.path_order:
+            self.paths[path.as_posix()] = PathEntry.create(
+                path=path.resolve(), is_root=True, only_python=self.only_python
             )
-        return self.paths.get(path)
+        return self.paths.get(path.as_posix())
+
+    def find_all(self, executable):
+        """Search the path for an executable. Return all copies.
+
+        :param executable: Name of the executable
+        :type executable: str
+        :returns: List[PathEntry]
+        """
+        sub_which = operator.methodcaller("which", name=executable)
+        filtered = filter(None, (sub_which(self.get_path(k)) for k in self.path_order))
+        return [f for f in filtered]
 
     def which(self, executable):
         """Search for an executable on the path.
@@ -126,9 +144,33 @@ class SystemPath(object):
         :returns: :class:`~pythonfinder.models.PathEntry` object.
         """
         sub_which = operator.methodcaller("which", name=executable)
-        return next(
-            (sub_which(self.get_path(k)) for k in self.path_order), None
+        filtered = filter(None, (sub_which(self.get_path(k)) for k in self.path_order))
+        return next((f for f in filtered), None)
+
+    def find_all_python_versions(self, major, minor=None, patch=None, pre=None, dev=None):
+        """Search for a specific python version on the path. Return all copies
+
+        :param major: Major python version to search for.
+        :type major: int
+        :param minor: Minor python version to search for, defaults to None
+        :param minor: int, optional
+        :param path: Patch python version to search for, defaults to None
+        :param path: int, optional
+        :return: A list of :class:`~pythonfinder.models.PathEntry` instances matching the version requested.
+        :rtype: List[:class:`~pythonfinder.models.PathEntry`]
+        """
+
+        sub_finder = operator.methodcaller(
+            "find_python_version", major, minor=minor, patch=patch, pre=pre, dev=dev
         )
+        if os.name == "nt" and self.windows_finder:
+            windows_finder_version = sub_finder(self.windows_finder)
+            if windows_finder_version:
+                return windows_finder_version
+        paths = (self.get_path(k) for k in self.path_order)
+        path_filter = filter(None, (sub_finder(p) for p in paths if p is not None))
+        version_sort = operator.attrgetter("as_python.version")
+        return [c for c in sorted(path_filter, key=version_sort, reverse=True)]
 
     def find_python_version(self, major, minor=None, patch=None, pre=None, dev=None):
         """Search for a specific python version on the path.
@@ -150,8 +192,8 @@ class SystemPath(object):
             windows_finder_version = sub_finder(self.windows_finder)
             if windows_finder_version:
                 return windows_finder_version
-        paths = [self.get_path(k) for k in self.path_order]
-        path_filter = filter(None, [sub_finder(p) for p in paths])
+        paths = (self.get_path(k) for k in self.path_order)
+        path_filter = filter(None, (sub_finder(p) for p in paths if p is not None))
         version_sort = operator.attrgetter("as_python.version")
         return next(
             (c for c in sorted(path_filter, key=version_sort, reverse=True)), None
@@ -180,7 +222,7 @@ class SystemPath(object):
         path_entries.update(
             {
                 p.as_posix(): PathEntry.create(
-                    path=p, is_root=True, only_python=only_python
+                    path=p.absolute(), is_root=True, only_python=only_python
                 )
                 for p in _path_objects
             }
@@ -197,6 +239,9 @@ class PathEntry(BasePath):
     py_version = attr.ib(default=None)
     pythons = attr.ib(default=None)
 
+    def __str__(self):
+        return fs_str('{0}'.format(self.path.as_posix()))
+
     def _filter_children(self):
         if self.only_python:
             children = filter_pythons(self.path)
@@ -219,9 +264,8 @@ class PathEntry(BasePath):
             if not self.py_version:
                 try:
                     from .python import PythonVersion
-
                     self.py_version = PythonVersion.from_path(self.path)
-                except ValueError:
+                except (ValueError, InvalidPythonVersion):
                     self.py_version = None
         return self.py_version
 
diff --git a/pipenv/vendor/pythonfinder/models/pyenv.py b/pipenv/vendor/pythonfinder/models/pyenv.py
index befa2d24..8545ac59 100644
--- a/pipenv/vendor/pythonfinder/models/pyenv.py
+++ b/pipenv/vendor/pythonfinder/models/pyenv.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import attr
 from collections import defaultdict
 from . import BaseFinder
@@ -30,7 +31,7 @@ class PyenvFinder(BaseFinder):
                 version.get("is_prerelease"),
                 version.get("is_devrelease"),
             )
-            versions[version_tuple] = VersionPath.create(path=p, only_python=True)
+            versions[version_tuple] = VersionPath.create(path=p.resolve(), only_python=True)
         return versions
 
     @classmethod
diff --git a/pipenv/vendor/pythonfinder/models/python.py b/pipenv/vendor/pythonfinder/models/python.py
index af39798e..1f681767 100644
--- a/pipenv/vendor/pythonfinder/models/python.py
+++ b/pipenv/vendor/pythonfinder/models/python.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import attr
 import copy
 import platform
@@ -122,7 +123,7 @@ class PythonVersion(object):
         if not path.is_python:
             raise ValueError("Not a valid python path: %s" % path.path)
             return
-        py_version, _ = get_python_version(str(path.path))
+        py_version = get_python_version(str(path.path))
         instance_dict = cls.parse(py_version)
         if not isinstance(instance_dict.get("version"), Version):
             raise ValueError("Not a valid python path: %s" % path.path)
diff --git a/pipenv/vendor/pythonfinder/models/windows.py b/pipenv/vendor/pythonfinder/models/windows.py
index 77db6ff5..b6998823 100644
--- a/pipenv/vendor/pythonfinder/models/windows.py
+++ b/pipenv/vendor/pythonfinder/models/windows.py
@@ -1,10 +1,12 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import attr
 import operator
 from collections import defaultdict
 from . import BaseFinder
 from .path import PathEntry
 from .python import PythonVersion
+from ..exceptions import InvalidPythonVersion
 from ..utils import ensure_path
 
 
@@ -35,7 +37,10 @@ class WindowsFinder(BaseFinder):
         path = None
         for version_object in env_versions:
             path = ensure_path(version_object.info.install_path.__getattr__(""))
-            py_version = PythonVersion.from_windows_launcher(version_object)
+            try:
+                py_version = PythonVersion.from_windows_launcher(version_object)
+            except InvalidPythonVersion:
+                continue
             self.version_list.append(py_version)
             base_dir = PathEntry.create(
                 path,
diff --git a/pipenv/vendor/pythonfinder/pythonfinder.py b/pipenv/vendor/pythonfinder/pythonfinder.py
index 548b707a..50e1b8d8 100644
--- a/pipenv/vendor/pythonfinder/pythonfinder.py
+++ b/pipenv/vendor/pythonfinder/pythonfinder.py
@@ -1,4 +1,5 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import os
 import six
 from .models import SystemPath
@@ -39,15 +40,23 @@ class Finder(object):
             and not dev
             and isinstance(major, six.string_types)
         ):
+            from .models import PythonVersion
+            version_dict = {}
             if "." in major:
-                from .models import PythonVersion
-
                 version_dict = PythonVersion.parse(major)
-                major = version_dict["major"]
-                minor = version_dict["minor"]
-                patch = version_dict["patch"]
-                pre = version_dict["is_prerelease"]
-                dev = version_dict["is_devrelease"]
+            elif len(major) == 1:
+                version_dict = {
+                    'major': int(major),
+                    'minor': None,
+                    'patch': None,
+                    'is_prerelease': False,
+                    'is_devrelease': False
+                }
+            major = version_dict.get("major", major)
+            minor = version_dict.get("minor", minor)
+            patch = version_dict.get("patch", patch)
+            pre = version_dict.get("is_prerelease", pre)
+            dev = version_dict.get("is_devrelease", dev)
         if os.name == "nt":
             match = self.windows_finder.find_python_version(
                 major, minor=minor, patch=patch, pre=pre, dev=dev
diff --git a/pipenv/vendor/pythonfinder/utils.py b/pipenv/vendor/pythonfinder/utils.py
index b8615897..0cc5370a 100644
--- a/pipenv/vendor/pythonfinder/utils.py
+++ b/pipenv/vendor/pythonfinder/utils.py
@@ -1,9 +1,13 @@
 # -*- coding=utf-8 -*-
+from __future__ import print_function, absolute_import
 import attr
 import locale
 import os
+import six
 import subprocess
+import sys
 from fnmatch import fnmatch
+from .exceptions import InvalidPythonVersion
 
 try:
     from pathlib import Path
@@ -26,23 +30,26 @@ def _run(cmd):
     :returns: A 2-tuple of (output, error)
     """
     encoding = locale.getdefaultlocale()[1] or "utf-8"
-    env = os.environ.copy()
     c = subprocess.Popen(
         cmd,
-        encoding=encoding,
-        env=env,
-        universal_newlines=True,
+        env=os.environ.copy(),
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE,
     )
-    output, err = c.communicate()
-    return output.strip(), err.strip()
+    out, err = c.communicate()
+    return out.decode(encoding).strip(), err.decode(encoding).strip()
 
 
 def get_python_version(path):
     """Get python version string using subprocess from a given path."""
     version_cmd = [path, "-c", "import sys; print(sys.version.split()[0])"]
-    return _run(version_cmd)
+    try:
+        out, _ = _run(version_cmd)
+    except OSError:
+        raise InvalidPythonVersion("%s is not a valid python path" % path)
+    if not out:
+        raise InvalidPythonVersion("%s is not a valid python path" % path)
+    return out
 
 
 def optional_instance_of(cls):
@@ -111,3 +118,17 @@ def filter_pythons(path):
     if not path.is_dir():
         return path if path_is_python(path) else None
     return filter(lambda x: path_is_python(x), path.iterdir())
+
+
+def fs_str(string):
+    """Encodes a string into the proper filesystem encoding
+
+    Borrowed from pip-tools
+    """
+    if isinstance(string, str):
+        return string
+    assert not isinstance(string, bytes)
+    return string.encode(_fs_encoding)
+
+
+_fs_encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()