diff --git a/flake.nix b/flake.nix
index dc4457a04..af5f53460 100644
--- a/flake.nix
+++ b/flake.nix
@@ -47,17 +47,28 @@
           };
         }))
         (verilator.overrideAttrs (finalAttrs: previousAttrs: {
-          version = "5.044";
+          version = "5.046";
           VERILATOR_SRC_VERSION = "v${finalAttrs.version}";
           src = fetchFromGitHub {
             owner = "verilator";
             repo = "verilator";
             rev = "v${finalAttrs.version}";
-            hash = "sha256-z3jYNzhnZ+OocDAbmsRBWHNNPXLLvExKK1TLDi9JzPQ=";
+            hash = "sha256-dfZzbQrw/14dFvWnkmCDElwsGm6GdFstNAURujvEIb8=";
           };
           # drop patch https://github.com/NixOS/nixpkgs/commit/06be23d66287c004cb8ef933a9ff6589276ab104
           # since it's already included in 5.044
-          patches = [];
+          # and add patch https://github.com/verilator/verilator/commit/bb5a9dc247b3fc07a4e465601243a8c3655eeaff to use jemalloc
+          patches = [
+            (fetchpatch {
+              name = "Support-jemalloc-as-the-default-allocator-on-Linux.patch";
+              url = "https://github.com/verilator/verilator/commit/bb5a9dc247b3fc07a4e465601243a8c3655eeaff.patch";
+              hash = "sha256-5rVXPItwsP1Ok9rrLUCyLNlZB0S8UXsR74IxZXua1Y0=";
+            })
+          ];
+          # use jemalloc by default
+          buildInputs = previousAttrs.buildInputs ++ [
+            jemalloc
+          ];
           doCheck = false;
         }))
         gsim.packages.${system}.default