Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: devmem2 unstable-2004-08-05 -> 1.0 https://repology.org/project/devmem2/versions
attrpath: devmem2
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/by-name/de/devmem2/package.nix b/pkgs/by-name/de/devmem2/package.nix
index bc8a155b1cbb..e393605cdd47 100644
--- a/pkgs/by-name/de/devmem2/package.nix
+++ b/pkgs/by-name/de/devmem2/package.nix
@@ -6,14 +6,14 @@
 
 stdenv.mkDerivation {
   pname = "devmem2";
-  version = "unstable-2004-08-05";
+  version = "1.0";
 
   src = fetchurl {
     urls = [
       "http://lartmaker.nl/lartware/port/devmem2.c"
       "https://raw.githubusercontent.com/hackndev/tools/7ed212230f8fbb1da3424a15ee88de3279bf96ec/devmem2.c"
     ];
-    sha256 = "14f1k7v6i1yaxg4xcaaf5i4aqn0yabba857zjnbg9wiymy82qf7c";
+    sha256 = "sha256-7DgskK8+8vSWlf8UpNZSHlisSCxOKdbJ68qHaPaZwZE=";
   };
 
   hardeningDisable = [ "format" ]; # fix compile error

Source url did not change.