diff --git a/pkgs/development/python-modules/unpaddedbase64/default.nix b/pkgs/development/python-modules/unpaddedbase64/default.nix
index 96b27127cc6..b5ff5be2061 100644
--- a/pkgs/development/python-modules/unpaddedbase64/default.nix
+++ b/pkgs/development/python-modules/unpaddedbase64/default.nix
@@ -1,19 +1,25 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, poetry-core
 }:
 
 buildPythonPackage rec {
   pname = "unpaddedbase64";
-  version = "1.1.0";
+  version = "2.1.0";
+  format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "matrix-org";
     repo = "python-${pname}";
     rev = "refs/tags/v${version}";
-    sha256 = "0if3fjfxga0bwdq47v77fs9hrcqpmwdxry2i2a7pdqsp95258nxd";
+    sha256 = "1n6har8pxv0mqb96lanzihp1xf76aa17jw3977drb1fgz947pnmz";
   };
 
+  nativeBuildInputs = [
+    poetry-core
+  ];
+
   meta = with lib; {
     homepage = "https://github.com/matrix-org/python-unpaddedbase64";
     description = "Unpadded Base64";