diff --git a/Dockerfile b/Dockerfile
index 5d4dae2..fb1cfd1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,7 @@ WORKDIR /gh-action-detect-unmergeable/
 RUN ["make", "build", "-j"]
 
 FROM debian:buster-20200607-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
 WORKDIR /root/
 COPY --from=builder /gh-action-detect-unmergeable/ghaction_unmergeable_detection .
 ENTRYPOINT ["/root/ghaction_unmergeable_detection"]
\ No newline at end of file