diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0deb3288..cdf9bad7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,11 @@
 ### Fixes
 
 - Optimize now runs after creating / updating liquid clustering tables ([463](https://github.com/databricks/dbt-databricks/pull/463))
-- fix Pylance import errors ([471](https://github.com/databricks/dbt-databricks/pull/471))
+- Fixing an issue where the new python library install from index behavior breaks users who were already customizing their installs ([472](https://github.com/databricks/dbt-databricks/pull/472))
+
+### Under the Hood
+
+- fix Pylance import errors (thanks @dataders) ([471](https://github.com/databricks/dbt-databricks/pull/471))
 
 ## dbt-databricks 1.6.5 (September 26, 2023)
 
diff --git a/dbt/adapters/databricks/python_submissions.py b/dbt/adapters/databricks/python_submissions.py
index efe99640..b64e603c 100644
--- a/dbt/adapters/databricks/python_submissions.py
+++ b/dbt/adapters/databricks/python_submissions.py
@@ -96,14 +96,17 @@ def _submit_job(self, path: str, cluster_spec: dict) -> str:
         packages = self.parsed_model["config"].get("packages", [])
 
         # custom index URL or default
-        index_url = self.parsed_model["config"].get("index_url", "https://pypi.org/simple")
+        index_url = self.parsed_model["config"].get("index_url", None)
 
         # additional format of packages
         additional_libs = self.parsed_model["config"].get("additional_libs", [])
         libraries = []
 
         for package in packages:
-            libraries.append({"pypi": {"package": package, "repo": index_url}})
+            if index_url:
+                libraries.append({"pypi": {"package": package, "repo": index_url}})
+            else:
+                libraries.append({"pypi": {"package": package}})
 
         for lib in additional_libs:
             libraries.append(lib)