diff --git a/pkgs/by-name/ir/irrd/package.nix b/pkgs/by-name/ir/irrd/package.nix
index 1be5211f501a..97b464f8f068 100644
--- a/pkgs/by-name/ir/irrd/package.nix
+++ b/pkgs/by-name/ir/irrd/package.nix
@@ -3,7 +3,6 @@
   python3,
   fetchPypi,
   fetchFromGitHub,
-  fetchpatch,
   git,
   postgresql,
   postgresqlTestHook,
@@ -35,27 +34,35 @@ let
         };
         doCheck = false;
       });
+
+      # https://github.com/irrdnet/irrd/blob/0fd95020279060f2bc2816c0533c825e40f4c73c/pyproject.toml#L58C1-L59C1
+      limits = prev.limits.overridePythonAttrs (oldAttrs: rec {
+        version = "5.6.0";
+        src = fetchFromGitHub {
+          owner = "alisaifee";
+          repo = "limits";
+          tag = version;
+          hash = "sha256-kghfF2ihEvyMPEGO1m9BquCdeBsYRoPyIljdLL1hToQ=";
+        };
+        doCheck = false;
+      });
+
     };
   };
 in
 
-py.pkgs.buildPythonPackage rec {
+py.pkgs.buildPythonPackage (finalAttrs: {
   pname = "irrd";
-  version = "4.5.0b2";
+  version = "4.5.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "irrdnet";
     repo = "irrd";
-    rev = "v${version}";
-    hash = "sha256-MMacxjF0LLSdInSwXwpHJUTdUQJ6sl4yu83vWR/A4Jc=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-6z94Ha2QQ0LE4o3hzsNl4y/nPv849cSP8on3UeegE4c=";
   };
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace-fail py-radix py-radix-sr
-  '';
-
   pythonRelaxDeps = true;
 
   build-system = with python3.pkgs; [ poetry-core ];
@@ -153,10 +160,10 @@ py.pkgs.buildPythonPackage rec {
   ];
 
   meta = {
-    changelog = "https://irrd.readthedocs.io/en/v${version}/releases/";
+    changelog = "https://irrd.readthedocs.io/en/${finalAttrs.src.tag}/releases/";
     description = "Internet Routing Registry database server, processing IRR objects in the RPSL format";
     license = lib.licenses.mit;
     homepage = "https://github.com/irrdnet/irrd";
     maintainers = with lib.maintainers; [ yureka-wdz ];
   };
-}
+})