diff --git a/libc/kernel/uapi/linux/dm-ioctl.h b/libc/kernel/uapi/linux/dm-ioctl.h
index 3aa627d..51e997f 100644
--- a/libc/kernel/uapi/linux/dm-ioctl.h
+++ b/libc/kernel/uapi/linux/dm-ioctl.h
@@ -82,6 +82,7 @@
   DM_TARGET_MSG_CMD,
   DM_DEV_SET_GEOMETRY_CMD,
   DM_DEV_ARM_POLL_CMD,
+  DM_GET_TARGET_VERSION_CMD,
 };
 #define DM_IOCTL 0xfd
 #define DM_VERSION _IOWR(DM_IOCTL, DM_VERSION_CMD, struct dm_ioctl)
@@ -99,12 +100,13 @@
 #define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
 #define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)
 #define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
+#define DM_GET_TARGET_VERSION _IOWR(DM_IOCTL, DM_GET_TARGET_VERSION_CMD, struct dm_ioctl)
 #define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
 #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
 #define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 40
+#define DM_VERSION_MINOR 41
 #define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl(2019-01-18)"
+#define DM_VERSION_EXTRA "-ioctl(2019-09-16)"
 #define DM_READONLY_FLAG (1 << 0)
 #define DM_SUSPEND_FLAG (1 << 1)
 #define DM_PERSISTENT_DEV_FLAG (1 << 3)