diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index f81d18f..777f908 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -239,7 +239,7 @@
     dracula: ['file.drac', 'file.drc', 'file.lvs', 'file.lpe', 'drac.file'],
     dtd: ['file.dtd'],
     dtrace: ['/usr/lib/dtrace/io.d'],
-    dts: ['file.dts', 'file.dtsi', 'file.dtso', 'file.its', 'file.keymap'],
+    dts: ['file.dts', 'file.dtsi', 'file.dtso', 'file.its', 'file.keymap', 'file.overlay'],
     dune: ['jbuild', 'dune', 'dune-project', 'dune-workspace', 'dune-file'],
     dylan: ['file.dylan'],
     dylanintr: ['file.intr'],
diff --git a/src/version.c b/src/version.c
index 74837b3..e670349 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    823,
+/**/
     822,
 /**/
     821,