diff --git a/runtime/autoload/dist/ft.vim b/runtime/autoload/dist/ft.vim
index a75d31bb59..c6fbd07d35 100644
--- a/runtime/autoload/dist/ft.vim
+++ b/runtime/autoload/dist/ft.vim
@@ -2336,6 +2336,8 @@ const ft_from_ext = {
   "kts": "kotlin",
   # KDE script
   "ks": "kscript",
+  # Kaitai struct
+  "ksy": "yaml",
   # Kyaml
   "kyaml": "yaml",
   "kyml": "yaml",
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index e2350871be..3e6a538a82 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -996,7 +996,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     xslt: ['file.xsl', 'file.xslt'],
     yacc: ['file.yy', 'file.yxx', 'file.y++'],
     yaml: ['file.yaml', 'file.yml', 'file.eyaml', 'file.kyaml', 'file.kyml', 'any/.bundle/config', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle', 'matplotlibrc', 'yarn.lock',
-           '/home/user/.kube/config', '/home/user/.kube/kuberc', '.condarc', 'condarc', '.mambarc', 'mambarc', 'pixi.lock', 'buf.lock'],
+           '/home/user/.kube/config', '/home/user/.kube/kuberc', '.condarc', 'condarc', '.mambarc', 'mambarc', 'pixi.lock', 'buf.lock', 'file.ksy'],
     yang: ['file.yang'],
     yara: ['file.yara', 'file.yar'],
     yuck: ['file.yuck'],
diff --git a/src/version.c b/src/version.c
index 23d96b9e47..f77ed07b9b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -729,6 +729,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    559,
 /**/
     558,
 /**/