diff --git a/src/somef/export/json_export.py b/src/somef/export/json_export.py
index 02890904..537e2efa 100644
--- a/src/somef/export/json_export.py
+++ b/src/somef/export/json_export.py
@@ -239,8 +239,13 @@ def format_date(date_string):
                         req_type = x[constants.PROP_RESULT].get("type")
                         if req_type:
                             entry["@type"] = map_requirement_type(req_type)
+                            
                         if version:
-                            entry["version"] = version.strip()
+                            if isinstance(version, str):
+                                entry["version"] = version.strip()
+                            else:
+                                entry["version"] = str(version)
+
                         code_parser_requirements.append(entry)
                         seen_structured.add(key)