diff --git a/pkgs/tools/misc/torrenttools/default.nix b/pkgs/tools/misc/torrenttools/default.nix
index 6daa39dd7e73..3a634ec17373 100644
--- a/pkgs/tools/misc/torrenttools/default.nix
+++ b/pkgs/tools/misc/torrenttools/default.nix
@@ -54,6 +54,10 @@ stdenv.mkDerivation rec {
   ];
   sourceRoot = "torrenttools";
 
+  patches = [
+    ./fmt-9.patch
+  ];
+
   postUnpack = ''
     cp -pr cliprogress torrenttools/external/cliprogress
     cp -pr dottorrent torrenttools/external/dottorrent
diff --git a/pkgs/tools/misc/torrenttools/fmt-9.patch b/pkgs/tools/misc/torrenttools/fmt-9.patch
new file mode 100644
index 000000000000..5bdc666d4bd2
--- /dev/null
+++ b/pkgs/tools/misc/torrenttools/fmt-9.patch
@@ -0,0 +1,29 @@
+diff --git a/include/file_matcher.hpp b/include/file_matcher.hpp
+index c10c7be405..b67baec0ef 100644
+--- a/include/file_matcher.hpp
++++ b/include/file_matcher.hpp
+@@ -47,7 +47,7 @@
+         }
+ 
+         std::string error;
+-        std::string pattern = ".*.{}$"_format(extension);
++        std::string pattern = fmt::format(".*.{}$", extension);
+         file_include_list_.Add(pattern, &error);
+         file_include_list_empty_ = false;
+         Ensures(error.empty());
+@@ -62,7 +62,7 @@
+         }
+ 
+         std::string error;
+-        std::string pattern = ".*\\.{}$"_format(extension);
++        std::string pattern = fmt::format(".*\\.{}$", extension);
+         file_exclude_list_.Add(pattern, &error);
+         file_exclude_list_empty_ = false;
+         Ensures(error.empty());
+@@ -243,4 +243,4 @@
+ };
+ 
+ 
+-} // namespace torrenttools
+\ No newline at end of file
++} // namespace torrenttools
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index aa116a3908ae..2649ac69fdbe 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16008,7 +16008,7 @@ with pkgs;
   };
 
   torrenttools = callPackage ../tools/misc/torrenttools {
-    fmt = fmt_8;
+    fmt = fmt_9;
   };
 
   tony = libsForQt5.callPackage ../applications/audio/tony { };