diff --git a/cms/envs/common.py b/cms/envs/common.py
index 27e16e5c430c..986afff8528b 100644
--- a/cms/envs/common.py
+++ b/cms/envs/common.py
@@ -1978,10 +1978,8 @@
 ]
 
 LIBRARY_BLOCK_TYPES = [
-    {
-        'component': 'library_sourced',
-        'boilerplate_name': None
-    },
+    # Per https://github.com/openedx/build-test-release-wg/issues/231
+    # we removed the library source content block from defaults until complete.
     {
         'component': 'library_content',
         'boilerplate_name': None