diff --git a/README.md b/README.md
index 273b044..6f821f2 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ A [cert-manager][2] ACME DNS01 solver webhook for [DNSimple][1].
 
 ## Pre-requisites
 
-- [cert-manager][2] >= 0.13 (The Helm chart uses the new API versions)
+- [cert-manager][2] >= 1.0.0 (The Helm chart uses the new API versions)
 - Kubernetes >= 1.17.x
 - Helm 3 (otherwise adjust the example below accordingly)