diff --git a/Changes b/Changes
index e311a996..4614fd43 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,9 @@
+2.046006 - 2020-10-??
+
+  [BUG FIXES]
+
+  * Try again to drop unneeded constraint on netmap_positions
+
 2.046005 - 2020-10-17
 
   [ENHANCEMENTS]
diff --git a/MANIFEST b/MANIFEST
index 0b1be04f..c66026a8 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -401,6 +401,7 @@ share/schema_versions/App-Netdisco-DB-6-7-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-60-61-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-61-62-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-62-63-PostgreSQL.sql
+share/schema_versions/App-Netdisco-DB-63-64-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-7-8-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-8-9-PostgreSQL.sql
 share/schema_versions/App-Netdisco-DB-9-10-PostgreSQL.sql
diff --git a/lib/App/Netdisco/DB.pm b/lib/App/Netdisco/DB.pm
index fa4e6e6f..4a6081f3 100644
--- a/lib/App/Netdisco/DB.pm
+++ b/lib/App/Netdisco/DB.pm
@@ -11,7 +11,7 @@ __PACKAGE__->load_namespaces(
 );
 
 our # try to hide from kwalitee
-  $VERSION = 63; # schema version used for upgrades, keep as integer
+  $VERSION = 64; # schema version used for upgrades, keep as integer
 
 use Path::Class;
 use File::ShareDir 'dist_dir';
diff --git a/share/schema_versions/App-Netdisco-DB-63-64-PostgreSQL.sql b/share/schema_versions/App-Netdisco-DB-63-64-PostgreSQL.sql
new file mode 100644
index 00000000..5664a121
--- /dev/null
+++ b/share/schema_versions/App-Netdisco-DB-63-64-PostgreSQL.sql
@@ -0,0 +1,5 @@
+BEGIN;
+
+ALTER TABLE netmap_positions DROP CONSTRAINT netmap_positions_device_groups_key;
+
+COMMIT;