diff --git a/Dockerfile b/Dockerfile
index c414652..523025b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ ARG SU_EXEC_VERSION=0.2
 WORKDIR /build
 RUN wget -O "/build/su-exec-${SU_EXEC_VERSION}.tar.gz" "https://github.com/ncopa/su-exec/archive/refs/tags/v${SU_EXEC_VERSION}.tar.gz"
 ADD su-exec.sha512sums /build/su-exec.sha512sums
-RUN sha512sum -wc /build/su-exec.sha512sums && \
+RUN sha512sum -c /build/su-exec.sha512sums && \
     tar -xf "/build/su-exec-${SU_EXEC_VERSION}.tar.gz"
 
 WORKDIR "/build/su-exec-${SU_EXEC_VERSION}"
@@ -38,7 +38,7 @@ WORKDIR /
 RUN wget -O "/tini-${TINI_VERSION}.tar.gz" "https://github.com/krallin/tini/archive/refs/tags/v${TINI_VERSION}.tar.gz" && \
     wget -O "/223.patch" "https://github.com/krallin/tini/commit/10479a6eef32f8e64fd5bf894dee9c7a6f21ce4c.patch"
 ADD tini.sha512sums /tini.sha512sums
-RUN sha512sum -wc /tini.sha512sums && \
+RUN sha512sum -c /tini.sha512sums && \
     tar -xf "/tini-${TINI_VERSION}.tar.gz" && \
     patch -Np1 -d "/tini-${TINI_VERSION}" -i "/223.patch"