diff --git a/.github/workflows/update_versions.yml b/.github/workflows/update_versions.yml
index b7a5ac8..4449f26 100644
--- a/.github/workflows/update_versions.yml
+++ b/.github/workflows/update_versions.yml
@@ -27,6 +27,8 @@ jobs:
         python-version: 3.12.2
 
     - name: Update versions.json
+      env:
+        DATA_JSON: ${{ github.event.inputs.datajson }}
       run: |
         python3 update_versions.py
 
diff --git a/update_versions.py b/update_versions.py
index 8fbf158..c37c42a 100644
--- a/update_versions.py
+++ b/update_versions.py
@@ -1,7 +1,10 @@
 import json
 import re
+import os
 
-data_json = "${{ github.event.inputs.datajson }}"
+data_json = os.environ.get("DATA_JSON")
+if not data_json:
+    raise ValueError("DATA_JSON environment variable not set")
 data = json.loads(data_json)
 
 with open('versions.json', 'r') as f: