diff --git a/backend-node/src/services/dynamicFormService.ts b/backend-node/src/services/dynamicFormService.ts
index 1ed28140..c40037bb 100644
--- a/backend-node/src/services/dynamicFormService.ts
+++ b/backend-node/src/services/dynamicFormService.ts
@@ -857,10 +857,22 @@ export class DynamicFormService {
       const values: any[] = Object.values(changedFields);
       values.push(id); // WHERE 조건용 ID 추가
 
+      // 🔑 Primary Key 타입에 맞게 캐스팅
+      const pkDataType = columnTypes[primaryKeyColumn];
+      let pkCast = '';
+      if (pkDataType === 'integer' || pkDataType === 'bigint' || pkDataType === 'smallint') {
+        pkCast = '::integer';
+      } else if (pkDataType === 'numeric' || pkDataType === 'decimal') {
+        pkCast = '::numeric';
+      } else if (pkDataType === 'uuid') {
+        pkCast = '::uuid';
+      }
+      // text, varchar 등은 캐스팅 불필요
+
       const updateQuery = `
         UPDATE ${tableName} 
         SET ${setClause}
-        WHERE ${primaryKeyColumn} = $${values.length}::text
+        WHERE ${primaryKeyColumn} = $${values.length}${pkCast}
         RETURNING *
       `;