diff --git a/news/2484.bugfix b/news/2484.bugfix
new file mode 100644
index 0000000000..ea4e1d298a
--- /dev/null
+++ b/news/2484.bugfix
@@ -0,0 +1 @@
+Resolved an issue parsing usernames from private PyPI URIs in ``Pipfiles`` by updating ``requirementslib``.
diff --git a/news/2484.vendor b/news/2484.vendor
new file mode 100644
index 0000000000..ea4e1d298a
--- /dev/null
+++ b/news/2484.vendor
@@ -0,0 +1 @@
+Resolved an issue parsing usernames from private PyPI URIs in ``Pipfiles`` by updating ``requirementslib``.
diff --git a/pipenv/vendor/requirementslib/__init__.py b/pipenv/vendor/requirementslib/__init__.py
index 88623173e9..776d2a15bc 100644
--- a/pipenv/vendor/requirementslib/__init__.py
+++ b/pipenv/vendor/requirementslib/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding=utf-8 -*-
-__version__ = "1.0.8"
+__version__ = "1.0.9"
 
 
 from .exceptions import RequirementError
diff --git a/pipenv/vendor/requirementslib/_compat.py b/pipenv/vendor/requirementslib/_compat.py
index 95b647ab31..52b35565fe 100644
--- a/pipenv/vendor/requirementslib/_compat.py
+++ b/pipenv/vendor/requirementslib/_compat.py
@@ -39,8 +39,6 @@ def do_import(module_path, subimport=None, old_path=None):
 
 
 InstallRequirement = do_import("req.req_install", "InstallRequirement")
-parse_requirements = do_import("req.req_file", "parse_requirements")
-RequirementSet = do_import("req.req_set", "RequirementSet")
 user_cache_dir = do_import("utils.appdirs", "user_cache_dir")
 FAVORITE_HASH = do_import("utils.hashes", "FAVORITE_HASH")
 is_file_url = do_import("download", "is_file_url")
@@ -48,18 +46,10 @@ def do_import(module_path, subimport=None, old_path=None):
 path_to_url = do_import("download", "path_to_url")
 is_archive_file = do_import("download", "is_archive_file")
 _strip_extras = do_import("req.req_install", "_strip_extras")
-PackageFinder = do_import("index", "PackageFinder")
-FormatControl = do_import("index", "FormatControl")
 Link = do_import("index", "Link")
 Wheel = do_import("wheel", "Wheel")
-Command = do_import("basecommand", "Command")
-cmdoptions = do_import("cmdoptions")
-get_installed_distributions = do_import(
-    "utils.misc", "get_installed_distributions", old_path="utils"
-)
 is_installable_file = do_import("utils.misc", "is_installable_file", old_path="utils")
 is_installable_dir = do_import("utils.misc", "is_installable_dir", old_path="utils")
-PyPI = do_import("models.index", "PyPI")
 make_abstract_dist = do_import(
     "operations.prepare", "make_abstract_dist", old_path="req.req_set"
 )
diff --git a/pipenv/vendor/requirementslib/models/requirements.py b/pipenv/vendor/requirementslib/models/requirements.py
index 99d8ec76dd..d49ce49416 100644
--- a/pipenv/vendor/requirementslib/models/requirements.py
+++ b/pipenv/vendor/requirementslib/models/requirements.py
@@ -8,7 +8,6 @@
 import requirements
 
 from first import first
-from pkg_resources import RequirementParseError
 from six.moves.urllib import parse as urllib_parse
 
 from .baserequirement import BaseRequirement
@@ -60,6 +59,7 @@ class NamedRequirement(BaseRequirement):
 
     @req.default
     def get_requirement(self):
+        from pkg_resources import RequirementParseError
         try:
             req = first(requirements.parse("{0}{1}".format(self.name, self.version)))
         except RequirementParseError:
diff --git a/pipenv/vendor/requirementslib/models/utils.py b/pipenv/vendor/requirementslib/models/utils.py
index 13b2b3683f..82309e9be9 100644
--- a/pipenv/vendor/requirementslib/models/utils.py
+++ b/pipenv/vendor/requirementslib/models/utils.py
@@ -4,8 +4,6 @@
 import six
 from attr import validators
 from first import first
-from packaging.markers import Marker, InvalidMarker
-from packaging.specifiers import SpecifierSet, InvalidSpecifier
 from .._compat import Link
 from ..utils import SCHEME_LIST, VCS_LIST, is_star
 
@@ -84,7 +82,7 @@ def strip_ssh_from_git_uri(uri):
 
 
 def add_ssh_scheme_to_git_uri(uri):
-    """Cleans VCS uris from pipenv.patched.notpip format"""
+    """Cleans VCS uris from pip format"""
     if isinstance(uri, six.string_types):
         # Add scheme for parsing purposes, this is also what pip does
         if uri.startswith("git+") and "://" not in uri:
@@ -94,6 +92,7 @@ def add_ssh_scheme_to_git_uri(uri):
 
 def split_markers_from_line(line):
     """Split markers from a dependency"""
+    from packaging.markers import Marker, InvalidMarker
     if not any(line.startswith(uri_prefix) for uri_prefix in SCHEME_LIST):
         marker_sep = ";"
     else:
@@ -125,6 +124,7 @@ def validate_path(instance, attr_, value):
 
 
 def validate_markers(instance, attr_, value):
+    from packaging.markers import Marker, InvalidMarker
     try:
         Marker("{0}{1}".format(attr_.name, value))
     except InvalidMarker:
@@ -132,6 +132,7 @@ def validate_markers(instance, attr_, value):
 
 
 def validate_specifiers(instance, attr_, value):
+    from packaging.specifiers import SpecifierSet, InvalidSpecifier
     if value == "":
         return True
     try:
diff --git a/pipenv/vendor/requirementslib/utils.py b/pipenv/vendor/requirementslib/utils.py
index 4204d73a13..4c0d3e07d1 100644
--- a/pipenv/vendor/requirementslib/utils.py
+++ b/pipenv/vendor/requirementslib/utils.py
@@ -159,7 +159,7 @@ def prepare_pip_source_args(sources, pip_args=None):
         # Trust the host if it's not verified.
         if not sources[0].get("verify_ssl", True):
             pip_args.extend(
-                ["--trusted-host", urlparse(sources[0]["url"]).netloc.split(":")[0]]
+                ["--trusted-host", urlparse(sources[0]["url"]).hostname]
             )
         # Add additional sources as extra indexes.
         if len(sources) > 1:
diff --git a/pipenv/vendor/vendor.txt b/pipenv/vendor/vendor.txt
index 0b2808f010..10cd29444c 100644
--- a/pipenv/vendor/vendor.txt
+++ b/pipenv/vendor/vendor.txt
@@ -27,7 +27,7 @@ requests==2.19.1
     idna==2.7
     urllib3==1.23
     certifi==2018.4.16
-requirementslib==1.0.8
+requirementslib==1.0.9
     attrs==18.1.0
     distlib==0.2.7
     packaging==17.1