diff --git a/conf/app.src b/conf/app.src
index 5e5bc8e..4350e11 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/backdrop/backdrop/releases/download/1.20.3/backdrop.zip
-SOURCE_SUM=e44521ac85dfcfb0814902a8650dd9cf9ec6d03d23462ee820714f09a3b3ac61
+SOURCE_URL=https://github.com/backdrop/backdrop/releases/download/1.21.0/backdrop.zip
+SOURCE_SUM=9d0e307150259ce186658605b6907160818f7cf2f1c9d39035ae63ed7e5be717
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=true
diff --git a/manifest.json b/manifest.json
index 7241409..b923cc8 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": "1.20.3~ynh1",
+    "version": "1.21.0~ynh1",
     "url": "https://backdropcms.org/",
     "upstream": {
         "license": "GPL-2.0",