diff --git a/base_requirements.txt b/base_requirements.txt
index 70a46cf..9d09d84 100644
--- a/base_requirements.txt
+++ b/base_requirements.txt
@@ -11,6 +11,6 @@ eth-address-index==0.7.3
 eth-token-index==0.6.2
 eth-faucet==0.3.4
 erc20-transfer-authorization==0.5.0
-erc20-demurrage-token==0.5.2
+erc20-demurrage-token==0.5.6
 eth-interface==0.1.1
 #cic-contracts==0.2.0