diff --git a/lib/vault.sh b/lib/vault.sh
index ed42ffc..3281a71 100644
--- a/lib/vault.sh
+++ b/lib/vault.sh
@@ -158,6 +158,19 @@ before execution. See the TOML file for details."
   local file_path="vault/actions/${action_id}.toml"
   _vault_log "Writing ${file_path} to branch ${branch}"
 
+  # Get current file content if exists (for upload API)
+  local current_content=""
+  local file_exists
+  file_exists=$(curl -sf -s -o /dev/null -w "%{http_code}" \
+    -H "Authorization: token ${FORGE_TOKEN}" \
+    "${ops_api}/contents/${file_path}?ref=${branch}" 2>/dev/null || echo "0")
+
+  if [ "$file_exists" = "200" ]; then
+    current_content=$(curl -sf -H "Authorization: token ${FORGE_TOKEN}" \
+      "${ops_api}/contents/${file_path}?ref=${branch}" 2>/dev/null | \
+      jq -r '.content // empty')
+  fi
+
   # Encode TOML content as base64
   local encoded_content
   encoded_content=$(printf '%s' "$toml_content" | base64 -w 0)