diff --git a/pkgs/by-name/sn/snagboot/package.nix b/pkgs/by-name/sn/snagboot/package.nix
index d13ad71332a8..58bff0f669e3 100644
--- a/pkgs/by-name/sn/snagboot/package.nix
+++ b/pkgs/by-name/sn/snagboot/package.nix
@@ -11,14 +11,14 @@
 
 python3Packages.buildPythonApplication rec {
   pname = "snagboot";
-  version = "2.2";
+  version = "2.4";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "bootlin";
     repo = "snagboot";
     tag = "v${version}";
-    hash = "sha256-JXhh+Ed/ZwytNrMwvGw7jaDBvwDQiUKe+gBDezOCHO4=";
+    hash = "sha256-ZjN4k5prOoEdAT4z37XiHdnUgLsz3zeR3+0zxY+2420=";
   };
 
   build-system = with python3Packages; [
@@ -42,8 +42,11 @@ python3Packages.buildPythonApplication rec {
     libfdt
     # swig
     packaging
+    xmodem
   ];
 
+  pythonRelaxDeps = [ "pylibfdt" ];
+
   optional-dependencies = with python3Packages; {
     gui = [ kivy ];
   };