diff --git a/pyproject.toml b/pyproject.toml
index bce1708f..829e3b93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ python = "^3.6"
 
 colorlog = "4.0.2"
 sawtooth-sdk = "1.1.3"
-sawtooth-signing = "1.1.3"
+sawtooth-signing = "1.1.5"
 cryptography = "2.5"
 protobuf = "3.6.1"
 requests = "2.21.0"