diff --git a/Dockerfile b/Dockerfile
index c5409cf..69fd235 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,11 @@ RUN ARCH=$([ "$TARGETARCH" = "arm64" ] && echo "aarch64" || echo "x86_64") \
     && curl -fsSL -o /tmp/SHA256SUMS \
        "https://github.com/ScalableCapital/scalable-cli/releases/download/v${SCALABLE_CLI_VERSION}/sc-v${SCALABLE_CLI_VERSION}-SHA256SUMS" \
     && cd /tmp \
-    && grep "linux-${ARCH}-gnu.tar.gz" SHA256SUMS | sha256sum -c - \
+    && EXPECTED=$(grep "linux-${ARCH}-gnu.tar.gz" SHA256SUMS | awk '{print $1}') \
+    && ACTUAL=$(sha256sum sc.tar.gz | awk '{print $1}') \
+    && if [ "$EXPECTED" != "$ACTUAL" ]; then \
+         echo "SHA256 mismatch: expected $EXPECTED, got $ACTUAL"; exit 1; \
+       fi \
     && tar -xzf sc.tar.gz \
     && mv sc-v${SCALABLE_CLI_VERSION}-linux-${ARCH}-gnu/sc /usr/local/bin/sc \
     && chmod +x /usr/local/bin/sc