diff --git a/Dockerfile b/Dockerfile
index b70a52c..1f569e8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@ ARG TARGETARCH
 COPY signal-cli/signal-cli-${TARGETARCH}.gz /tmp/signal-cli.gz
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends wget && \
+    apt-get install -y --no-install-recommends ca-certificates wget && \
     gunzip /tmp/signal-cli.gz && \
     mv /tmp/signal-cli /usr/local/bin/signal-cli && \
     chmod +x /usr/local/bin/signal-cli && \