diff --git a/core/mbedtls.lib b/core/mbedtls.lib
new file mode 100644
index 0000000000..2b36566c3d
--- /dev/null
+++ b/core/mbedtls.lib
@@ -0,0 +1 @@
+https://developer.mbed.org/teams/sandbox/code/mbedtls/#dee5972f341f