diff --git a/pkgs/development/python-modules/block-io/default.nix b/pkgs/development/python-modules/block-io/default.nix
index 07d6cffe56c..24ddd429cd9 100644
--- a/pkgs/development/python-modules/block-io/default.nix
+++ b/pkgs/development/python-modules/block-io/default.nix
@@ -20,7 +20,7 @@ buildPythonPackage rec {
 
   preConfigure = ''
     substituteInPlace setup.py \
-      --replace "ecdsa==0.13" "ecdsa>=0.13" \
+      --replace "ecdsa==0.15" "ecdsa>=0.15" \
       --replace "base58==1.0.3" "base58>=1.0.3"
   '';