diff --git a/conf/app.src b/conf/app.src
index b5a0bd7..1ae5b08 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/BookStackApp/BookStack/archive/refs/tags/v21.05.4.tar.gz
-SOURCE_SUM=c9142af3590c693e47ee4350f21b327242e0036c46bfcdf533b9a6f76f805e9a
+SOURCE_URL=https://github.com/BookStackApp/BookStack/archive/refs/tags/v21.08.tar.gz
+SOURCE_SUM=15b980cd42e124680c184b718adbd4bc222f01a83cd31ae9d1fec1b28c43eb32
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true
diff --git a/manifest.json b/manifest.json
index ea7f1cc..7d3200c 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": "21.05.4~ynh1",
+    "version": "21.08~ynh1",
     "url": "https://www.bookstackapp.com/",
     "upstream": {
         "license": "MIT",