diff --git a/README.md b/README.md
index 0c7d2cf8..72e5e88c 100644
--- a/README.md
+++ b/README.md
@@ -295,8 +295,8 @@ grype <image> -o <format>
 Where the formats available are:
 
 - `table`: A columnar summary (default).
-- `cyclonedx`: An XML report conforming to the [CycloneDX 1.4 specification](https://cyclonedx.org/specification/overview/).
-- `cyclonedx-json`: A JSON report conforming to the [CycloneDX 1.4 specification](https://cyclonedx.org/specification/overview/).
+- `cyclonedx`: An XML report conforming to the [CycloneDX 1.6 specification](https://cyclonedx.org/specification/overview/).
+- `cyclonedx-json`: A JSON report conforming to the [CycloneDX 1.6 specification](https://cyclonedx.org/specification/overview/).
 - `json`: Use this to get as much information out of Grype as possible!
 - `sarif`: Use this option to get a [SARIF](https://docs.oasis-open.org/sarif/sarif/v2.1.0/sarif-v2.1.0.html) report (Static Analysis Results Interchange Format)
 - `template`: Lets the user specify the output format. See ["Using templates"](#using-templates) below.