diff --git a/lib/transaction/transaction.js b/lib/transaction/transaction.js
index 276b7fb..6ef17c4 100644
--- a/lib/transaction/transaction.js
+++ b/lib/transaction/transaction.js
@@ -66,7 +66,7 @@ var MAX_BLOCK_SIZE = 1000000;
 Transaction.DUST_AMOUNT = 546;
 
 // Margin of error to allow fees in the vecinity of the expected value but doesn't allow a big difference
-Transaction.FEE_SECURITY_MARGIN = 15;
+Transaction.FEE_SECURITY_MARGIN = 150;
 
 // max amount of satoshis in circulation
 Transaction.MAX_MONEY = 21000000 * 1e8;
@@ -78,7 +78,7 @@ Transaction.NLOCKTIME_BLOCKHEIGHT_LIMIT = 5e8;
 Transaction.NLOCKTIME_MAX_VALUE = 4294967295;
 
 // Value used for fee estimation (satoshis per kilobyte)
-Transaction.FEE_PER_KB = 10000;
+Transaction.FEE_PER_KB = 100000;
 
 // Safe upper bound for change address script size in bytes
 Transaction.CHANGE_OUTPUT_MAX_SIZE = 20 + 4 + 34 + 4;