diff --git a/pipenv/vendor/pythonfinder/models/path.py b/pipenv/vendor/pythonfinder/models/path.py
index 523f117a..df755fa6 100644
--- a/pipenv/vendor/pythonfinder/models/path.py
+++ b/pipenv/vendor/pythonfinder/models/path.py
@@ -150,15 +150,15 @@ class SystemPath(object):
     def _remove_path(self, path):
         path_copy = reversed(self.path_order[:])
         new_order = []
-        target = os.path.normcase(os.path.normpath(os.path.abspath(path)))
+        target = normalize_path(path)
         path_map = {
-            os.path.normcase(os.path.normpath(os.path.abspath(pth))): pth
+            normalize_path(pth): pth
             for pth in self.paths.keys()
         }
         if target in path_map:
             del self.paths[path_map.get(target)]
         for current_path in path_copy:
-            normalized = os.path.normcase(os.path.normpath(os.path.abspath(current_path)))
+            normalized = normalize_path(current_path)
             if normalized != target:
                 new_order.append(normalized)
         new_order = reversed(new_order)
diff --git a/pipenv/vendor/pythonfinder/utils.py b/pipenv/vendor/pythonfinder/utils.py
index b8714f52..fb932b10 100644
--- a/pipenv/vendor/pythonfinder/utils.py
+++ b/pipenv/vendor/pythonfinder/utils.py
@@ -114,7 +114,7 @@ def _filter_none(k, v):
 
 
 def normalize_path(path):
-    return os.path.normpath(os.path.normcase(os.path.abspath(path)))
+    return os.path.normpath(os.path.normcase(os.path.abspath(str(path))))
 
 
 @lru_cache(maxsize=1024)
diff --git a/pipenv/vendor/vendor.txt b/pipenv/vendor/vendor.txt
index c106a59c..62317853 100644
--- a/pipenv/vendor/vendor.txt
+++ b/pipenv/vendor/vendor.txt
@@ -34,7 +34,7 @@ requirementslib==1.3.0
     pyparsing==2.2.2
     pytoml==0.1.19
     plette==0.2.2
-        tomlkit==0.5.2
+        tomlkit==0.4.6
 shellingham==1.2.7
 six==1.11.0
 semver==2.8.1