diff --git a/pkgs/by-name/fi/firefly-iii-data-importer/package.nix b/pkgs/by-name/fi/firefly-iii-data-importer/package.nix
index e80858c75720..3f5dbe669942 100644
--- a/pkgs/by-name/fi/firefly-iii-data-importer/package.nix
+++ b/pkgs/by-name/fi/firefly-iii-data-importer/package.nix
@@ -66,7 +66,12 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   passthru = {
     phpPackage = php84;
     tests = nixosTests.firefly-iii-data-importer;
-    updateScript = nix-update-script { extraArgs = [ "--version-regex='v([0-9]+\.[0-9]+\.[0-9]+)'" ]; };
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--version-regex"
+        "v(\\d+\\.\\d+\\.\\d+)"
+      ];
+    };
   };
 
   postInstall = ''
diff --git a/pkgs/by-name/fi/firefly-iii/package.nix b/pkgs/by-name/fi/firefly-iii/package.nix
index 21f8a88cd75b..005f8b172f2f 100644
--- a/pkgs/by-name/fi/firefly-iii/package.nix
+++ b/pkgs/by-name/fi/firefly-iii/package.nix
@@ -55,7 +55,12 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   passthru = {
     phpPackage = php84;
     tests = nixosTests.firefly-iii;
-    updateScript = nix-update-script { extraArgs = [ "--version-regex='v([0-9]+\.[0-9]+\.[0-9]+)'" ]; };
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--version-regex"
+        "v(\\d+\\.\\d+\\.\\d+)"
+      ];
+    };
   };
 
   postInstall = ''