diff --git a/iiif-server/template.yaml b/iiif-server/template.yaml
index ab7c2f5..f69fdb5 100644
--- a/iiif-server/template.yaml
+++ b/iiif-server/template.yaml
@@ -192,7 +192,7 @@ Resources:
           - !Sub "${Hostname}.${DomainName}"
         ViewerCertificate:
           AcmCertificateArn: !Ref CertificateArn
-          MinimumProtocolVersion: TLSv1
+          MinimumProtocolVersion:  TLSv1.2_2021
           SslSupportMethod: sni-only
         Origins:
           - Id: IiifLambda