diff --git a/letsencrypt/build.yaml b/letsencrypt/build.yaml
index fe1550e5..bcb9e9b3 100644
--- a/letsencrypt/build.yaml
+++ b/letsencrypt/build.yaml
@@ -16,8 +16,8 @@ args:
   CERTBOT_DNS_DESEC_VERSION: 1.2.1
   CERTBOT_DNS_DIRECTADMIN_VERSION: 1.0.15
   CERTBOT_DNS_DOMAINOFFENSIVE_VERSION: 2.0.0
-  CERTBOT_DNS_DREAMHOST_VERSION: 1.0
-  CERTBOT_DNS_DUCKDNS_VERSION: 1.5
+  CERTBOT_DNS_DREAMHOST_VERSION: "1.0"
+  CERTBOT_DNS_DUCKDNS_VERSION: "1.5"
   CERTBOT_DNS_DYNU_VERSION: 0.0.8
   CERTBOT_DNS_EASYDNS_VERSION: 0.1.4
   CERTBOT_DNS_EURODNS_VERSION: 1.8.1