diff --git a/gitlab-ci/tools/repro-check.sh b/gitlab-ci/tools/repro-check.sh
index 978961a3a08..f8fe6b7a639 100755
--- a/gitlab-ci/tools/repro-check.sh
+++ b/gitlab-ci/tools/repro-check.sh
@@ -268,6 +268,11 @@ download_ci_files() {
     local os_url="${BASE_URL}/${os_type}/update-img/update-img.tar.gz"
     local sha_url="${BASE_URL}/${os_type}/update-img/SHA256SUMS"
 
+    if [ "$os_type" == "host-os" ]; then
+        os_url="${BASE_URL}/${os_type}/update-img/update-img.tar.zst"
+        sha_url="${BASE_URL}/${os_type}/update-img/SHA256SUMS"
+    fi
+
     if [ "$os_type" == "setup-os" ]; then
         os_url="${BASE_URL}/${os_type}/disk-img/disk-img.tar.gz"
         sha_url="${BASE_URL}/${os_type}/disk-img/SHA256SUMS"
@@ -304,7 +309,7 @@ check_ci_hash() {
 log "Validating that uploaded image hashes match the provided proposal hashes"
 
 check_ci_hash "guestos" "update-img.tar.gz" "ci_package_guestos_sha256_hex"
-check_ci_hash "hostos" "update-img.tar.gz" "ci_package_hostos_sha256_hex"
+check_ci_hash "hostos" "update-img.tar.zst" "ci_package_hostos_sha256_hex"
 check_ci_hash "setupos" "disk-img.tar.gz" "ci_package_setupos_sha256_hex"
 
 log_success "The CI's artifacts and hash match"
@@ -351,7 +356,7 @@ log "Build IC-OS"
 log_success "Built IC-OS successfully"
 
 mv artifacts/icos/guestos/update-img.tar.gz "$dev_out/guestos"
-mv artifacts/icos/hostos/update-img.tar.gz "$dev_out/hostos"
+mv artifacts/icos/hostos/update-img.tar.zst "$dev_out/hostos"
 mv artifacts/icos/setupos/disk-img.tar.gz "$dev_out/setupos"
 
 compute_dev_hash() {
@@ -367,7 +372,7 @@ compute_dev_hash() {
 }
 
 compute_dev_hash "guestos" "update-img.tar.gz" "dev_package_guestos_sha256_hex"
-compute_dev_hash "hostos" "update-img.tar.gz" "dev_package_hostos_sha256_hex"
+compute_dev_hash "hostos" "update-img.tar.zst" "dev_package_hostos_sha256_hex"
 compute_dev_hash "setupos" "disk-img.tar.gz" "dev_package_setupos_sha256_hex"
 
 compare_hashes() {