diff --git a/scripts/7_merge_SAEHD.sh b/scripts/7_merge_SAEHD.sh
index f7d91df..616aa57 100755
--- a/scripts/7_merge_SAEHD.sh
+++ b/scripts/7_merge_SAEHD.sh
@@ -2,7 +2,7 @@
 cd "$(dirname $0)/.."
 source scripts/env.sh
 
-python "$DFL_MAIN" merge \
+python3.9 "$DFL_MAIN" merge \
   --input-dir "$WORKSPACE/data_dst" \
   --output-dir "$WORKSPACE/data_dst/merged" \
   --output-mask-dir "$WORKSPACE/data_dst/merged_mask" \