+Arvados supports CWL v1.0, v1.1 and v1.2.
+
+h2(#v12). Upgrading your workflows to CWL v1.2
+
+If you are starting from a CWL v1.0 document, see "Upgrading your workflows to CWL v1.1":#v11 below.
+
+If you are starting from a CWL v1.1 document, you should be able to trivially change @cwlVersion: v1.1@ to @cwlVersion: v1.2@ to be able to take advantage of the new features of v1.2, such as conditional workflow steps.
+
+h2(#v11). Upgrading your workflows to CWL v1.1