diff --git a/main.fnl b/main.fnl
index be5f69e..f929aa7 100644
--- a/main.fnl
+++ b/main.fnl
@@ -89,7 +89,7 @@
 (fn new-crt [csr]
   (let [crt
         (doto (x509.new)
-          (: :setVersion 2)
+          (: :setVersion 3)
           (: :setSerial (make-serial))
           (: :setIssuer (ca-crt:getSubject))
           (: :setLifetime (os.time) (+ (* 365 86400) (os.time)))