diff --git a/debian/changelog b/debian/changelog
index 10ca530..16d03c7 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 hypopg (1.1.4-2) unstable; urgency=medium
 
   * Team upload for PostgreSQL 13.
+  * Use source format 3.0 (quilt).
   * Use dh --with pgxs_loop.
   * DH 13.
   * R³: no.
diff --git a/debian/source/format b/debian/source/format
index d3827e7..163aaf8 100644
--- a/debian/source/format
+++ b/debian/source/format
@@ -1 +1 @@
-1.0
+3.0 (quilt)