diff --git a/Dockerfile.runner b/Dockerfile.runner
index 5e3a12bc07..83317006e9 100644
--- a/Dockerfile.runner
+++ b/Dockerfile.runner
@@ -34,6 +34,8 @@ RUN just build ftl
 
 # Finally create the runtime image.
 FROM ubuntu:24.04
+RUN apt-get update
+RUN apt-get install -y ca-certificates
 
 WORKDIR /root/