diff --git a/conf/app.src b/conf/app.src
index 4350e11..86b4125 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/backdrop/backdrop/releases/download/1.21.0/backdrop.zip
-SOURCE_SUM=9d0e307150259ce186658605b6907160818f7cf2f1c9d39035ae63ed7e5be717
+SOURCE_URL=https://github.com/backdrop/backdrop/releases/download/1.21.1/backdrop.zip
+SOURCE_SUM=8d5a7322568a95e5ae85728ec681e2b8d7c7785112a6a2570469c9bf18d3bdbe
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=true
diff --git a/manifest.json b/manifest.json
index b923cc8..acc07f1 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Easy-to-use CMS for building professional websites",
         "fr": "CMS facile à utiliser pour créer des sites Web professionnels"
     },
-    "version": "1.21.0~ynh1",
+    "version": "1.21.1~ynh1",
     "url": "https://backdropcms.org/",
     "upstream": {
         "license": "GPL-2.0",