diff --git a/conf/app.src b/conf/app.src
index 2ee3e63..6db463f 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/BookStackApp/BookStack/archive/refs/tags/v21.08.2.tar.gz
-SOURCE_SUM=da3de3ad238596be7ef9b3ed83c745babf2844e82628cabad339643064d9a0b3
+SOURCE_URL=https://github.com/BookStackApp/BookStack/archive/refs/tags/v21.08.4.tar.gz
+SOURCE_SUM=750417187003b6e0e922be6874e60fa8fda898c31ad598f7bc2f7e3e7d178f1c
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true
diff --git a/manifest.json b/manifest.json
index 31c158d..4f5ce66 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Platform to create documentation/wiki content",
         "fr": "Plateforme pour créer du contenu de documentation/wiki "
     },
-    "version": "21.08.2~ynh1",
+    "version": "21.08.4~ynh1",
     "url": "https://www.bookstackapp.com/",
     "upstream": {
         "license": "MIT",