diff --git a/LibGit2Sharp/Core/NativeMethods.cs b/LibGit2Sharp/Core/NativeMethods.cs
index 8c24cff3a0ea1a5f5fc8cc054e199ad5e396373d..f5d45f3cf16bbeb84a14f456401e5ae0faf2bb75 100644
--- a/LibGit2Sharp/Core/NativeMethods.cs
+++ b/LibGit2Sharp/Core/NativeMethods.cs
@@ -764,6 +764,42 @@ private sealed class NativeShutdownObject : CriticalFinalizerObject
         internal static extern int git_libgit2_opts(int option, out GitStrArray extensions);
         #endregion
 
+        #region git_libgit2_opts_osxarm64
+
+        // For RID osx-arm64 the calling convention is different: we need to pad out to 8 arguments before varargs
+        // (see discussion at https://github.com/dotnet/runtime/issues/48796)
+
+        // git_libgit2_opts(GIT_OPT_GET_SEARCH_PATH, int level, git_buf *buf)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, uint level, GitBuf buf);
+
+        // git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, int level, const char *path)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, uint level,
+            [MarshalAs(UnmanagedType.CustomMarshaler, MarshalCookie = UniqueId.UniqueIdentifier, MarshalTypeRef = typeof(StrictUtf8Marshaler))] string path);
+
+        // git_libgit2_opts(GIT_OPT_ENABLE_*, int enabled)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, int enabled);
+
+        // git_libgit2_opts(GIT_OPT_SET_USER_AGENT, const char *path)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8,
+            [MarshalAs(UnmanagedType.CustomMarshaler, MarshalCookie = UniqueId.UniqueIdentifier, MarshalTypeRef = typeof(StrictUtf8Marshaler))] string path);
+
+        // git_libgit2_opts(GIT_OPT_GET_USER_AGENT, git_buf *buf)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, GitBuf buf);
+
+        // git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, const char **extensions, size_t len)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, IntPtr extensions, UIntPtr len);
+
+        // git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, git_strarray *out)
+        [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl, EntryPoint = "git_libgit2_opts")]
+        internal static extern int git_libgit2_opts_osxarm64(int option, IntPtr nop2, IntPtr nop3, IntPtr nop4, IntPtr nop5, IntPtr nop6, IntPtr nop7, IntPtr nop8, out GitStrArray extensions);
+        #endregion
+
         [DllImport(libgit2, CallingConvention = CallingConvention.Cdecl)]
         internal static extern unsafe int git_graph_ahead_behind(out UIntPtr ahead, out UIntPtr behind, git_repository* repo, ref GitOid one, ref GitOid two);
 
diff --git a/LibGit2Sharp/Core/Proxy.cs b/LibGit2Sharp/Core/Proxy.cs
index 8991430bdb6ea1e34af04eba41dc53c759757e23..cd32050c4fb81885b98183ea352d5539de6bb02e 100644
--- a/LibGit2Sharp/Core/Proxy.cs
+++ b/LibGit2Sharp/Core/Proxy.cs
@@ -14,6 +14,9 @@ namespace LibGit2Sharp.Core
 {
     internal class Proxy
     {
+        internal static readonly bool isOSXArm64 = RuntimeInformation.ProcessArchitecture == Architecture.Arm64
+                                                   && RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
+
         #region git_blame_
 
         public static unsafe BlameHandle git_blame_file(
@@ -3408,7 +3411,11 @@ public static string git_libgit2_opts_get_search_path(ConfigurationLevel level)
 
             using (var buf = new GitBuf())
             {
-                var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetSearchPath, (uint)level, buf);
+                int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.GetSearchPath, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)level, buf);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetSearchPath, (uint)level, buf);
                 Ensure.ZeroResult(res);
 
                 path = LaxUtf8Marshaler.FromNative(buf.ptr) ?? string.Empty;
@@ -3419,7 +3426,10 @@ public static string git_libgit2_opts_get_search_path(ConfigurationLevel level)
 
         public static void git_libgit2_opts_enable_strict_hash_verification(bool enabled)
         {
-            NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableStrictHashVerification, enabled ? 1 : 0);
+            if (isOSXArm64)
+                NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.EnableStrictHashVerification, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, enabled ? 1 : 0);
+            else
+                NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableStrictHashVerification, enabled ? 1 : 0);
         }
 
         /// <summary>
@@ -3432,7 +3442,11 @@ public static void git_libgit2_opts_enable_strict_hash_verification(bool enabled
         /// </param>
         public static void git_libgit2_opts_set_search_path(ConfigurationLevel level, string path)
         {
-            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetSearchPath, (uint)level, path);
+            int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.SetSearchPath, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)level, path);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetSearchPath, (uint)level, path);
             Ensure.ZeroResult(res);
         }
 
@@ -3443,7 +3457,11 @@ public static void git_libgit2_opts_set_search_path(ConfigurationLevel level, st
         public static void git_libgit2_opts_set_enable_caching(bool enabled)
         {
             // libgit2 expects non-zero value for true
-            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableCaching, enabled ? 1 : 0);
+            int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.EnableCaching, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, enabled ? 1 : 0);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableCaching, enabled ? 1 : 0);
             Ensure.ZeroResult(res);
         }
 
@@ -3454,7 +3472,11 @@ public static void git_libgit2_opts_set_enable_caching(bool enabled)
         public static void git_libgit2_opts_set_enable_ofsdelta(bool enabled)
         {
             // libgit2 expects non-zero value for true
-            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableOfsDelta, enabled ? 1 : 0);
+            int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.EnableOfsDelta, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, enabled ? 1 : 0);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableOfsDelta, enabled ? 1 : 0);
             Ensure.ZeroResult(res);
         }
 
@@ -3465,7 +3487,11 @@ public static void git_libgit2_opts_set_enable_ofsdelta(bool enabled)
         public static void git_libgit2_opts_set_enable_strictobjectcreation(bool enabled)
         {
             // libgit2 expects non-zero value for true
-            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableStrictObjectCreation, enabled ? 1 : 0);
+            int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.EnableStrictObjectCreation, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, enabled ? 1 : 0);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.EnableStrictObjectCreation, enabled ? 1 : 0);
             Ensure.ZeroResult(res);
         }
 
@@ -3476,7 +3502,11 @@ public static void git_libgit2_opts_set_enable_strictobjectcreation(bool enabled
         /// <param name="userAgent">The user-agent string to use</param>
         public static void git_libgit2_opts_set_user_agent(string userAgent)
         {
-            var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetUserAgent, userAgent);
+            int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.SetUserAgent, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, userAgent);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetUserAgent, userAgent);
             Ensure.ZeroResult(res);
         }
 
@@ -3492,7 +3522,11 @@ public static string git_libgit2_opts_get_user_agent()
 
             using (var buf = new GitBuf())
             {
-                var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetUserAgent, buf);
+                int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.GetUserAgent, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, buf);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetUserAgent, buf);
                 Ensure.ZeroResult(res);
 
                 userAgent = LaxUtf8Marshaler.FromNative(buf.ptr) ?? string.Empty;
@@ -3505,7 +3539,11 @@ public static void git_libgit2_opts_set_extensions(string[] extensions)
         {
             using (var array = GitStrArrayManaged.BuildFrom(extensions))
             {
-                var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetExtensions, array.Array.Strings, array.Array.Count);
+                int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.SetExtensions, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, array.Array.Strings, array.Array.Count);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.SetExtensions, array.Array.Strings, array.Array.Count);
                 Ensure.ZeroResult(res);
             }
         }
@@ -3516,7 +3554,11 @@ public static string[] git_libgit2_opts_get_extensions()
 
             try
             {
-                var res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetExtensions, out array.Array);
+                int res;
+                if (isOSXArm64)
+                    res = NativeMethods.git_libgit2_opts_osxarm64((int)LibGit2Option.GetExtensions, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, out array.Array);
+                else
+                    res = NativeMethods.git_libgit2_opts((int)LibGit2Option.GetExtensions, out array.Array);
                 Ensure.ZeroResult(res);
 
                 return array.ReadStrings();