diff --git a/third_party/mbedtls/README.md b/third_party/mbedtls/README.md
index 88e513b96..4d775ca16 100644
--- a/third_party/mbedtls/README.md
+++ b/third_party/mbedtls/README.md
@@ -2,11 +2,11 @@
 
 ## URL
 
-https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.9.0
+https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.13.0
 
 ## Version
 
-2.9.0
+2.13.0
 
 ## License