diff --git a/pkgs/by-name/nu/numbat/package.nix b/pkgs/by-name/nu/numbat/package.nix
index ce3c954b88c24..075701e2983d2 100644
--- a/pkgs/by-name/nu/numbat/package.nix
+++ b/pkgs/by-name/nu/numbat/package.nix
@@ -2,23 +2,33 @@
 , stdenv
 , testers
 , fetchFromGitHub
+, fetchpatch
 , rustPlatform
 , darwin
 , numbat
+, tzdata
 }:
 
 rustPlatform.buildRustPackage rec {
   pname = "numbat";
-  version = "1.12.0";
+  version = "1.13.0";
 
   src = fetchFromGitHub {
     owner = "sharkdp";
     repo = "numbat";
     rev = "v${version}";
-    hash = "sha256-MYoNziQiyppftLPNM8cqEuNwUA4KCmtotQqDhgyef1E=";
+    hash = "sha256-o3EYhMFBgs/Ni+YCM3+RdUYlwRt+nMaEP/cAkDXMVHc=";
   };
 
-  cargoHash = "sha256-t6vxJ0UIQJILCGv4PO5V4/QF5de/wtMQDkb8gPtE70E=";
+  cargoHash = "sha256-rK9RPd/hww2F87l/dd14pB4izE58NuqaewYaqMimV1M=";
+
+  patches = [
+    # https://github.com/sharkdp/numbat/pull/562
+    (fetchpatch {
+      url = "https://github.com/sharkdp/numbat/commit/4756a1989ecdab35fd05ca18c721ed15d8cde2b1.patch";
+      hash = "sha256-22+yePjy+MxJQ60EdvgaTw/IVV0d/wS2Iqza1p1xmfk=";
+    })
+  ];
 
   buildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
     darwin.apple_sdk.frameworks.Security
@@ -31,6 +41,13 @@ rustPlatform.buildRustPackage rec {
     cp -r $src/numbat/modules $out/share/numbat/
   '';
 
+  preCheck = ''
+    # The datetime library used by Numbat, "jiff", always attempts to use the
+    # system TZDIR on Unix and doesn't fall back to the embedded tzdb when not
+    # present.
+    export TZDIR=${tzdata}/share/zoneinfo
+  '';
+
   passthru.tests.version = testers.testVersion {
     package = numbat;
   };
@@ -46,5 +63,7 @@ rustPlatform.buildRustPackage rec {
     license = with licenses; [ asl20 mit ];
     mainProgram = "numbat";
     maintainers = with maintainers; [ giomf atemu ];
+    # Failing tests on Darwin.
+    broken = stdenv.isDarwin;
   };
 }