diff --git a/External/libgit2 b/External/libgit2
index 49e408b3..f28579db 160000
--- a/External/libgit2
+++ b/External/libgit2
@@ -1 +1 @@
-Subproject commit 49e408b3208bc3093757a1c2db938d3590f3f412
+Subproject commit f28579db11737eaa2ced18498e229967a12f1c3f
diff --git a/ObjectiveGit/GTOID.m b/ObjectiveGit/GTOID.m
index 23412df4..45d4741e 100644
--- a/ObjectiveGit/GTOID.m
+++ b/ObjectiveGit/GTOID.m
@@ -10,6 +10,7 @@
 #import "NSError+Git.h"
 
 #import "git2/errors.h"
+#import "git2/deprecated.h"
 #import "git2/odb.h"
 
 @interface GTOID () {
diff --git a/ObjectiveGit/GTObject.h b/ObjectiveGit/GTObject.h
index e562e8dc..e8762eb2 100644
--- a/ObjectiveGit/GTObject.h
+++ b/ObjectiveGit/GTObject.h
@@ -37,8 +37,9 @@ typedef NS_ENUM(int, GTObjectType) {
 	GTObjectTypeTree = GIT_OBJECT_TREE,			/**< A tree (directory listing) object. */
 	GTObjectTypeBlob = GIT_OBJECT_BLOB,			/**< A file revision object. */
 	GTObjectTypeTag = GIT_OBJECT_TAG,				/**< An annotated tag object. */
-	GTObjectTypeOffsetDelta = GIT_OBJECT_OFS_DELTA,/**< A delta, base is given by an offset. */
-	GTObjectTypeRefDelta = GIT_OBJECT_REF_DELTA,	/**< A delta, base is given by object id. */
+	// Pack-only types are no longer part of libgit2's public object enum.
+	GTObjectTypeOffsetDelta = 6,					/**< A delta, base is given by an offset. */
+	GTObjectTypeRefDelta = 7,						/**< A delta, base is given by object id. */
 };
 
 @class GTRepository;
diff --git a/ObjectiveGit/GTRepository.h b/ObjectiveGit/GTRepository.h
index d1c4819c..18948e01 100644
--- a/ObjectiveGit/GTRepository.h
+++ b/ObjectiveGit/GTRepository.h
@@ -36,6 +36,7 @@
 #import <ObjectiveGit/GTFilterList.h>
 #import <ObjectiveGit/GTCheckoutOptions.h>
 #import <git2/checkout.h>
+#import <git2/deprecated.h>
 #import <git2/repository.h>
 #import <git2/transport.h>
 #import <git2/sys/transport.h>
diff --git a/script/update_libgit2 b/script/update_libgit2
index faf306e3..ddb9debe 100755
--- a/script/update_libgit2
+++ b/script/update_libgit2
@@ -69,6 +69,7 @@ cmake -DBUILD_SHARED_LIBS:BOOL=OFF \
   -DBUILD_TESTS:BOOL=OFF \
   -DTHREADSAFE:BOOL=ON \
   -DUSE_SSH=libssh2 \
+  -DUSE_GSSAPI:BOOL=OFF \
   -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
   ..
 cmake --build .