diff --git a/submodule.go b/submodule.go
index d5ab69f..f3e9e83 100644
--- a/submodule.go
+++ b/submodule.go
@@ -11,6 +11,14 @@ import (
 	"unsafe"
 )
 
+// SubmoduleUpdateOptions
+type SubmoduleUpdateOptions struct {
+	*CheckoutOpts
+	*RemoteCallbacks
+	CloneCheckoutStrategy CheckoutStrategy
+	Signature             *Signature
+}
+
 // Submodule
 type Submodule struct {
 	ptr *C.git_submodule
@@ -20,10 +28,10 @@ type SubmoduleUpdate int
 
 const (
 	SubmoduleUpdateReset    SubmoduleUpdate = C.GIT_SUBMODULE_UPDATE_RESET
-	SubmoduleUpdateCheckout SubmoduleUpdate  = C.GIT_SUBMODULE_UPDATE_CHECKOUT
-	SubmoduleUpdateRebase   SubmoduleUpdate  = C.GIT_SUBMODULE_UPDATE_REBASE
-	SubmoduleUpdateMerge    SubmoduleUpdate  = C.GIT_SUBMODULE_UPDATE_MERGE
-	SubmoduleUpdateNone     SubmoduleUpdate  = C.GIT_SUBMODULE_UPDATE_NONE
+	SubmoduleUpdateCheckout SubmoduleUpdate = C.GIT_SUBMODULE_UPDATE_CHECKOUT
+	SubmoduleUpdateRebase   SubmoduleUpdate = C.GIT_SUBMODULE_UPDATE_REBASE
+	SubmoduleUpdateMerge    SubmoduleUpdate = C.GIT_SUBMODULE_UPDATE_MERGE
+	SubmoduleUpdateNone     SubmoduleUpdate = C.GIT_SUBMODULE_UPDATE_NONE
 )
 
 type SubmoduleIgnore int
@@ -226,8 +234,8 @@ func (sub *Submodule) SetIgnore(ignore SubmoduleIgnore) SubmoduleIgnore {
 	return SubmoduleIgnore(o)
 }
 
-func (sub *Submodule) Update() SubmoduleUpdate {
-	o := C.git_submodule_update(sub.ptr)
+func (sub *Submodule) UpdateStrategy() SubmoduleUpdate {
+	o := C.git_submodule_update_strategy(sub.ptr)
 	return SubmoduleUpdate(o)
 }
 
@@ -307,3 +315,31 @@ func (repo *Repository) ReloadAllSubmodules(force bool) error {
 	}
 	return nil
 }
+
+func (sub *Submodule) Update(init bool, opts *SubmoduleUpdateOptions) error {
+	var copts C.git_submodule_update_options
+	populateSubmoduleUpdateOptions(&copts, opts)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_submodule_update(sub.ptr, cbool(init), &copts)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
+func populateSubmoduleUpdateOptions(ptr *C.git_submodule_update_options, opts *SubmoduleUpdateOptions) {
+	C.git_submodule_update_init_options(ptr, C.GIT_SUBMODULE_UPDATE_OPTIONS_VERSION)
+
+	if opts == nil {
+		return
+	}
+
+	populateCheckoutOpts(&ptr.checkout_opts, opts.CheckoutOpts)
+	populateRemoteCallbacks(&ptr.remote_callbacks, opts.RemoteCallbacks)
+	ptr.clone_checkout_strategy = C.uint(opts.CloneCheckoutStrategy)
+	ptr.signature = opts.Signature.toC()
+}
diff --git a/vendor/libgit2 b/vendor/libgit2
index 55d9c29..1646412 160000
--- a/vendor/libgit2
+++ b/vendor/libgit2
@@ -1 +1 @@
-Subproject commit 55d9c29aa0c69cdd766c5100fc012d8e0b486e23
+Subproject commit 1646412d8fc9e1532a194df2515e9a5fde4da988