diff --git a/Dockerfile b/Dockerfile
index 1ca4b29..d253ffd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 # ------------------------------------------------------------------------
-from mcluseau/golang-builder:1.14.0 as build
+from mcluseau/golang-builder:1.15.5 as build
 
 # ------------------------------------------------------------------------
-from alpine:3.11.3
+from alpine:3.12
 
 env busybox_v=1.28.1-defconfig-multiarch \
     arch=x86_64
diff --git a/main.go b/main.go
index bd24f6b..c651a85 100644
--- a/main.go
+++ b/main.go
@@ -138,11 +138,15 @@ func main() {
 	mount("overlay", "/system", "overlay", rootMountFlags,
 		"lowerdir="+strings.Join(lowers, ":")+",upperdir=/changes/upperdir,workdir=/changes/workdir")
 
-	// mount("/boot", "/system/boot", "", syscall.MS_BIND, "")
-	if layersInMemory && bootMounted {
-		if err := syscall.Unmount("/boot", 0); err != nil {
-			log.Print("WARNING: failed to unmount /boot: ", err)
-			time.Sleep(2 * time.Second)
+	if bootMounted {
+		if layersInMemory {
+			if err := syscall.Unmount("/boot", 0); err != nil {
+				log.Print("WARNING: failed to unmount /boot: ", err)
+				time.Sleep(2 * time.Second)
+			}
+
+		} else {
+			mount("/boot", "/system/boot", "", syscall.MS_BIND, "")
 		}
 	}