diff --git a/pkgs/tools/package-management/nix-update-source/default.nix b/pkgs/tools/package-management/nix-update-source/default.nix
index 13b158db81e0..9b21c1514046 100644
--- a/pkgs/tools/package-management/nix-update-source/default.nix
+++ b/pkgs/tools/package-management/nix-update-source/default.nix
@@ -2,13 +2,13 @@
 
 python3Packages.buildPythonApplication rec {
   pname = "nix-update-source";
-  version = "0.6.3";
+  version = "0.7.0";
 
   src = fetchFromGitHub {
+    hash = "sha256-+49Yb+rZ3CzFnwEpwj5xrcMUVBiYOJtCk9YeZ15IM/U=";
     owner = "timbertson";
     repo = "nix-update-source";
     rev = "version-${version}";
-    sha256 = "157wvv9vnaszzwbj68jpdc0imcm1hdab3z760bx2axbsgfpqqilz";
   };
 
   propagatedBuildInputs = [ nix-prefetch-scripts ];
@@ -34,20 +34,25 @@ python3Packages.buildPythonApplication rec {
         overrideSrc = drv: lib.overrideDerivation drv (orig: { inherit src; });
       };
 
-    updateScript = ''
-      #!${runtimeShell}
-      set -e
-      echo
-      cd ${toString ./.}
-      ${pkgs.nix-update-source}/bin/nix-update-source \
-        --prompt version \
-        --replace-attr version \
-        --set owner timbertson \
-        --set repo nix-update-source \
-        --set type fetchFromGitHub \
-        --set rev 'version-{version}' \
-        --modify-nix default.nix
-    '';
+
+    updateScript = [
+      runtimeShell
+      "-c"
+      ''
+        set -e
+        echo
+        cd ${toString ./.}
+        ${pkgs.nix-update-source}/bin/nix-update-source \
+          --prompt version \
+          --replace-attr version \
+          --set owner timbertson \
+          --set repo nix-update-source \
+          --set type fetchFromGitHub \
+          --set rev 'version-{version}' \
+          --nix-literal rev 'version-''${version}'\
+          --modify-nix default.nix
+      ''
+    ];
   };
 
   meta = {