diff --git a/gordian/repo.py b/gordian/repo.py
index ace55db..9298fe9 100644
--- a/gordian/repo.py
+++ b/gordian/repo.py
@@ -130,7 +130,7 @@ def _set_target_branch(self, target_branch, source_branch=None):
     def _get_repo_contents(self, path):
         try:
             logger.debug(f'Fetching repo contents {path}...')
-            return self._source_repo.get_contents(path, self.source_branch)
+            return self._source_repo.get_contents(path, self.target_branch)
         except GithubException as e:
             if e.status == 404:
                 raise e
@@ -248,6 +248,6 @@ def _get_new_version(self):
         elif self.semver_label == 'patch':
             patch = str(int(patch) + 1)
         self.new_version = '.'.join([major, minor, patch])
-    
+
     def get_github_client(self):
         return self._github