diff --git a/src/check b/src/check
index 481e77d..f90cc88 100755
--- a/src/check
+++ b/src/check
@@ -4,4 +4,4 @@ set -eu
 
 [ -e /opt/resource/common ] && cd /opt/resource
 . ./common
-jq --null-input --arg version "$(crane digest "$REPOSITORY:$TAG")" '[$version]'
+jq --null-input --arg version "$(crane digest "$REPOSITORY:$TAG")" '[{"digest": $version}]' | jq -r tostring
diff --git a/src/in b/src/in
index 5cc3e43..4e192f0 100755
--- a/src/in
+++ b/src/in
@@ -11,4 +11,4 @@ cd "$oci_dir"
 tar cf "$1/image.tar" ./*
 cd - 1>&2
 
-echo "$(jq .version < "$INPUT_FILE")"
+jq .version < "$INPUT_FILE" | jq -r tostring
diff --git a/src/out b/src/out
index 59c2607..223fa0d 100755
--- a/src/out
+++ b/src/out
@@ -11,4 +11,4 @@ cd "$oci_dir"
 tar xf "$1/$(jq -r .params.image < "$INPUT_FILE")"
 cd - 1>&2
 crane push "$oci_dir" "$REPOSITORY:$TAG" --image-refs="$IMAGE_REFS_FILE"
-jq --null-input --arg version "$(sed 's/^[^@]*@//' < "$IMAGE_REFS_FILE")" '$version'
+jq --null-input --arg version "$(sed 's/^[^@]*@//' < "$IMAGE_REFS_FILE")" '{"digest": $version}' | jq -r tostring