diff --git a/Dockerfile b/Dockerfile
index 70ce0b9..d10438c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,9 @@ ENV LETSENCRYPT_RELEASE v0.3.0
 
 ADD https://github.com/janeczku/rancher-letsencrypt/releases/download/${LETSENCRYPT_RELEASE}/rancher-letsencrypt-linux-amd64.tar.gz /tmp/rancher-letsencrypt.tar.gz
 
-RUN tar -zxvf /tmp/rancher-letsencrypt.tar.gz -C /usr/bin \
+RUN echo -n "d42f6ea5f8b8ad20bff30a9689c5a71203e4f2629e05cef34c0cba67965f5012  /tmp/rancher-letsencrypt.tar.gz" | \
+    sha256sum -c \
+    && tar -zxvf /tmp/rancher-letsencrypt.tar.gz -C /usr/bin \
 	&& chmod +x /usr/bin/rancher-letsencrypt
 
 ENTRYPOINT ["/usr/bin/rancher-letsencrypt"]
\ No newline at end of file