diff --git a/README.md b/README.md
index 05d95f9..3c7434a 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ the VM, possibly with extra options for tracing and halting on test failures
 
 You can also run the test against a different Cockpit image, for example:
 
-    TEST_OS=fedora-27 make check
+    TEST_OS=fedora-28 make check
 
 # Vagrant