diff --git a/README.md b/README.md
index 9ec1f63..46430e8 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Configuration
 Configure this plugin and its wrappers around GraalVM tools through the `graal` extension with the following options:
 
 **General GraalVM controls**
-* `graalVersion`: the version string to use when downloading GraalVM (defaults to `1.0.0-rc5`)
+* `graalVersion`: the version string to use when downloading GraalVM (defaults to `1.0.0-rc6`)
 * `downloadBaseUrl`: the base download URL to use (defaults to `https://github.com/oracle/graal/releases/download/`)
 
 **`native-image` controls**