diff --git a/Dockerfile b/Dockerfile
index 18aa21f..64a7484 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -25,6 +25,7 @@ RUN apt-get update \
         lua-zlib \
         lua5.1 \
         openssl \
+        ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
 # Install and configure prosody