diff --git a/tools/mac/README.dx b/tools/mac/README.dx
new file mode 100644
index 0000000..9229efc
--- /dev/null
+++ b/tools/mac/README.dx
@@ -0,0 +1,2 @@
+Dx version: 1.13
+dx and dx.jar are fetched from SDK build tools 26.0.0.
diff --git a/tools/mac/dx.tar.gz.sha1 b/tools/mac/dx.tar.gz.sha1
index 402acab..e397ea5 100644
--- a/tools/mac/dx.tar.gz.sha1
+++ b/tools/mac/dx.tar.gz.sha1
@@ -1 +1 @@
-5baa69bf12d60f4d3edf890e75b70c8a0df63a17
\ No newline at end of file
+9cf7833a3227085af3f6d95a4a4f64c56905f324
\ No newline at end of file