diff --git a/dagger-functions/src/main/java/com/gotocompany/dagger/functions/udfs/python/file/source/cos/CosClient.java b/dagger-functions/src/main/java/com/gotocompany/dagger/functions/udfs/python/file/source/cos/CosClient.java
index d787db38a..508212203 100644
--- a/dagger-functions/src/main/java/com/gotocompany/dagger/functions/udfs/python/file/source/cos/CosClient.java
+++ b/dagger-functions/src/main/java/com/gotocompany/dagger/functions/udfs/python/file/source/cos/CosClient.java
@@ -16,10 +16,9 @@
 
 public class CosClient {
 
-    // TODO find better way to initialize clients
-    private final String ENV_COS_SECRET_ID = "COS_SECRET_ID";
-    private final String ENV_COS_SECRET_KEY = "COS_SECRET_KEY";
-    private final String ENV_COS_REGION = "COS_REGION";
+    private static final String ENV_COS_SECRET_ID = "COS_SECRET_ID";
+    private static final String ENV_COS_SECRET_KEY = "COS_SECRET_KEY";
+    private static final String ENV_COS_REGION = "COS_REGION";
 
     private final COSClient libCosClient;