diff --git a/news/3449.bugfix.rst b/news/3449.bugfix.rst
new file mode 100644
index 00000000..72e8d228
--- /dev/null
+++ b/news/3449.bugfix.rst
@@ -0,0 +1 @@
+Update the index names in lock file when source name in Pipfile is changed.
diff --git a/pipenv/utils.py b/pipenv/utils.py
index 5ed21264..1fc4fd2d 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -241,9 +241,11 @@ def get_resolver_metadata(deps, index_lookup, markers_lookup, project, sources):
         dep = " ".join(remainder)
         req = Requirement.from_line(dep)
         constraints.append(req.constraint_line)
-
         if url:
-            index_lookup[req.name] = project.get_source(url=url).get("name")
+            source = first(
+                s for s in sources if s.get("url") and url.startswith(s["url"]))
+            if source:
+                index_lookup[req.name] = source.get("name")
         # strip the marker and re-add it later after resolution
         # but we will need a fallback in case resolution fails
         # eg pypiwin32
@@ -843,7 +845,7 @@ def convert_deps_to_pip(deps, project=None, r=True, include_index=True):
 
     dependencies = []
     for dep_name, dep in deps.items():
-        indexes = project.sources if hasattr(project, "sources") else []
+        indexes = project.pipfile_sources if hasattr(project, "pipfile_sources") else []
         new_dep = Requirement.from_pipfile(dep_name, dep)
         if new_dep.index:
             include_index = True
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 91861db3..b5b5bc85 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -129,7 +129,7 @@ class _Pipfile(object):
     def __init__(self, path):
         self.path = path
         self.document = tomlkit.document()
-        self.document["sources"] = tomlkit.aot()
+        self.document["source"] = tomlkit.aot()
         self.document["requires"] = tomlkit.table()
         self.document["packages"] = tomlkit.table()
         self.document["dev_packages"] = tomlkit.table()
@@ -155,7 +155,7 @@ class _Pipfile(object):
         source_table["url"] = os.environ.get("PIPENV_TEST_INDEX")
         source_table["verify_ssl"] = False
         source_table["name"] = "pipenv_test_index"
-        self.document["sources"].append(source_table)
+        self.document["source"].append(source_table)
         return tomlkit.dumps(self.document)
 
     def write(self):
diff --git a/tests/integration/test_lock.py b/tests/integration/test_lock.py
index 75095ac0..d993b1a2 100644
--- a/tests/integration/test_lock.py
+++ b/tests/integration/test_lock.py
@@ -564,3 +564,27 @@ def test_vcs_lock_respects_top_level_pins(PipenvInstance, pypi):
         assert "git" in p.lockfile["default"]["requests"]
         assert "urllib3" in p.lockfile["default"]
         assert p.lockfile["default"]["urllib3"]["version"] == "==1.21.1"
+
+
+@pytest.mark.lock
+def test_lock_after_update_source_name(PipenvInstance, pypi):
+    with PipenvInstance(pypi=pypi, chdir=True) as p:
+        contents = """
+[[source]]
+url = "https://test.pypi.org/simple"
+verify_ssl = true
+name = "test"
+
+[packages]
+six = "*"
+        """.strip()
+        with open(p.pipfile_path, 'w') as f:
+            f.write(contents)
+        c = p.pipenv("lock")
+        assert c.return_code == 0
+        assert p.lockfile["default"]["six"]["index"] == "test"
+        with open(p.pipfile_path, 'w') as f:
+            f.write(contents.replace('name = "test"', 'name = "custom"'))
+        c = p.pipenv("lock")
+        assert c.return_code == 0
+        assert p.lockfile["default"]["six"]["index"] == "custom"