diff --git a/conf/app.src b/conf/app.src
index 7483230..3837540 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://files.spip.net/spip/archives/spip-v4.1.7.zip
-SOURCE_SUM=1bf2dd8956bd2a8688e47af9e7058e73eaef265db50268e26713bc182a186686
+SOURCE_URL=https://files.spip.net/spip/archives/spip-v4.2.1.zip
+SOURCE_SUM=28a38c3bf8757b3427f3c0de618cbf7a5484cce112ccacde1c53823810aa521c
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=zip
 SOURCE_IN_SUBDIR=false
diff --git a/manifest.json b/manifest.json
index 376ede0..7ef93b2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "CMS with a focus on collaborative edition and multilingualism",
         "fr": "CMS conçu pour l'édition collaborative et le multilinguisme"
     },
-    "version": "4.1.7~ynh1",
+    "version": "4.2.1~ynh1",
     "url": "http://www.spip.net/",
     "upstream": {
         "license": "GPL-3.0-or-later",