diff --git a/Dockerfile b/Dockerfile
index 0d8f56297..6852824cd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,8 @@ FROM ${BUILD_FROM}
 
 ENV \
     S6_SERVICES_GRACETIME=10000 \
-    SUPERVISOR_API=http://localhost
+    SUPERVISOR_API=http://localhost \
+    CRYPTOGRAPHY_OPENSSL_NO_LEGACY=1
 
 ARG \
     CAS_VERSION