diff --git a/conf/app-mastodon.src b/conf/app-mastodon.src
index 62d10c6..7dc2b6f 100644
--- a/conf/app-mastodon.src
+++ b/conf/app-mastodon.src
@@ -1,5 +1,5 @@
-SOURCE_URL=https://github.com/tootsuite/mastodon/archive/v2.3.3.tar.gz
-SOURCE_SUM=b2b2e2ee7cc034e92258263500c423b900611407db67682777eef0526118f66e
+SOURCE_URL=https://github.com/tootsuite/mastodon/archive/v2.4.0rc2.zip
+SOURCE_SUM=fe2fbc865e6f174ab3dfaa7cc061b2134c75ff0fe43a577b0466c10642d50132
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true