switch to org.apache.sling.jcr.oak.server 1.2.8 release
diff --git a/src/main/features/oak/oak_base.json b/src/main/features/oak/oak_base.json
index 307ef21..e9043ef 100644
--- a/src/main/features/oak/oak_base.json
+++ b/src/main/features/oak/oak_base.json
@@ -118,7 +118,7 @@
             "start-order":"15"
         },
         {
-            "id":"org.apache.sling:org.apache.sling.jcr.oak.server:1.2.6",
+            "id":"org.apache.sling:org.apache.sling.jcr.oak.server:1.2.8",
             "start-order":"16"
         },
         {