diff --git a/README.md b/README.md
index 7efc3345..8cb5c5b7 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ This library is licensed under the Apache 2.0 License.
 
 ## Build Instructions
 
-CMake 3.13+ is required to build.
+CMake 3.9+ is required to build.
 
 `<install-path>` must be an absolute path in the following instructions.