diff --git a/packages/data-source/src/adapters/postgresql.ts b/packages/data-source/src/adapters/postgresql.ts
index f760596bd..29ef5a232 100644
--- a/packages/data-source/src/adapters/postgresql.ts
+++ b/packages/data-source/src/adapters/postgresql.ts
@@ -49,7 +49,12 @@ export class PostgreSQLAdapter extends BaseAdapter {
       };
 
       // Handle SSL configuration - default to true for security
-      config.ssl = pgCredentials.ssl ?? true;
+      // But allow self-signed certificates to avoid connection errors
+      if (pgCredentials.ssl !== false) {
+        config.ssl = pgCredentials.ssl === true || pgCredentials.ssl === undefined
+          ? { rejectUnauthorized: false } // Allow self-signed certificates
+          : pgCredentials.ssl; // Use custom SSL config if provided
+      }
 
       // Handle connection timeout
       if (pgCredentials.connection_timeout) {