diff --git a/flake.lock b/flake.lock
index a4d418ea2..d57a66a94 100644
--- a/flake.lock
+++ b/flake.lock
@@ -88,11 +88,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1780303090,
-        "narHash": "sha256-wSN5A+RmstGozf+wjtMagDYBXV8hpNoODWd0hl3ua18=",
+        "lastModified": 1780410653,
+        "narHash": "sha256-GgjcPoL9ZDuasunwIP0I9JTkP2oGvoZ93Vzwbwz1ldI=",
         "owner": "lowRISC",
         "repo": "lowrisc-nix",
-        "rev": "3c33a8aa466ea802355d704a17d600117ddea8d3",
+        "rev": "560d419c61cb216001f05db14ac64a310b64e4af",
         "type": "github"
       },
       "original": {
@@ -119,16 +119,16 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1777428379,
-        "narHash": "sha256-ypxFOeDz+CqADEQNL72haqGjvZQdBR5Vc7pyx2JDttI=",
+        "lastModified": 1780203844,
+        "narHash": "sha256-K5sT4jTpGs15ADhviMKNBH38REpPf5Q6mM1+N6cArVE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "755f5aa91337890c432639c60b6064bb7fe67769",
+        "rev": "b51242d7d43689db2f3be91bd05d5b24fbb469c4",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.11",
+        "ref": "nixos-26.05",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -236,11 +236,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1779411315,
-        "narHash": "sha256-IMFlxeyClau51KplhhSRGhdGTvD/knShHdybP1UOTuk=",
+        "lastModified": 1780358675,
+        "narHash": "sha256-n4jX4svZwmoWpzhz3If9wkvEYKv3WuDvprE8vi57MRY=",
         "owner": "pyproject-nix",
         "repo": "uv2nix",
-        "rev": "fdf2a76275d7a9c27deb5d2f2ab33526ac9052ff",
+        "rev": "3a557a9e78cc5b11bc9a610f27da4bdd5599edfe",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 77b3fec7b..4c5f4e43f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,7 +35,6 @@
   };
 
   outputs = {
-    self,
     nixpkgs,
     flake-utils,
     lowrisc-nix,
@@ -52,7 +51,7 @@
 
       pythonSet =
         (pkgs.callPackage inputs.pyproject-nix.build.packages {
-          python = pkgs.python310;
+          python = pkgs.python312;
         }).overrideScope
         (
           pkgs.lib.composeManyExtensions [
@@ -67,8 +66,9 @@
       fpga = import nix/fpga.nix {
         inherit
           pkgs
-          pythonEnv;
-          llvm = lrPkgs.llvm_cheri;
+          pythonEnv
+          ;
+        llvm = lrPkgs.llvm_cheri;
       };
       ftditool-cli = inputs.ftditool.packages.${system}.default;
 
@@ -85,7 +85,6 @@
         openocd
         uv
         pythonEnv
-        verilator
         verible
         srecord
         d2
@@ -101,6 +100,7 @@
             commonPackages
             ++ (with lrPkgs; [
               llvm_cheri
+              verilator_5_040
             ]);
           buildInputs = with pkgs; [libelf zlib];
           env = {
diff --git a/nix/fpga.nix b/nix/fpga.nix
index bdefb6458..28c027bcc 100644
--- a/nix/fpga.nix
+++ b/nix/fpga.nix
@@ -4,7 +4,7 @@
 {
   pkgs,
   pythonEnv,
-  llvm
+  llvm,
 }: let
   bitstream_path = "build/lowrisc_mocha_chip_mocha_genesys2_0/synth-vivado";
   bootrom_path = "build/sw/device/bootrom";
@@ -15,11 +15,11 @@ in {
     runtimeInputs = [pythonEnv llvm pkgs.gnumake pkgs.cmake pkgs.srecord];
     text = ''
       # Ask fusesoc to evaluate and generate the dependencies list.
-      fusesoc --cores-root=. run --target=synth --setup lowrisc:mocha:chip_mocha_genesys2 1> /dev/null 
+      fusesoc --cores-root=. run --target=synth --setup lowrisc:mocha:chip_mocha_genesys2 1> /dev/null
 
       # Build the bootROM because it's cheap, and copy the vmem to the src to be hashed.
       cmake -DCMAKE_BUILD_TYPE=Release -B build/sw -S sw  1> /dev/null
-      cmake --build build/sw --target bootrom 1> /dev/null 
+      cmake --build build/sw --target bootrom 1> /dev/null
       cp ${bootrom_path}/bootrom.vmem ${bitstream_path}
 
       # Hash the dependency list generated by fusesoc