diff --git a/flake.lock b/flake.lock
index 9faefa3ee..a4d418ea2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -49,16 +49,16 @@
         ]
       },
       "locked": {
-        "lastModified": 1779281183,
-        "narHash": "sha256-1TcYeyfEQ8vDmtF0gVfW358oXYYRb43jR5u42JZ9fVk=",
+        "lastModified": 1780322259,
+        "narHash": "sha256-Mx5UpEs8guUhRdvaI2ua58SkO11VK57TjjQLhsAiKag=",
         "owner": "lowRISC",
         "repo": "ftditool",
-        "rev": "3f173a9debaa805926c0235e36ab2fa0bef0a7f1",
+        "rev": "feabaa5e4ae8da3bb70ab4a124fd695040368020",
         "type": "github"
       },
       "original": {
         "owner": "lowRISC",
-        "ref": "v0.3.1",
+        "ref": "v0.4.0",
         "repo": "ftditool",
         "type": "github"
       }
@@ -88,11 +88,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1778839577,
-        "narHash": "sha256-KtbcYK/X9MuJXvhHIjyd65j/QGWPFpHJr/yTy8W7xg8=",
+        "lastModified": 1780303090,
+        "narHash": "sha256-wSN5A+RmstGozf+wjtMagDYBXV8hpNoODWd0hl3ua18=",
         "owner": "lowRISC",
         "repo": "lowrisc-nix",
-        "rev": "d3ef4932bf95666853cb879468c4228ddc8104e6",
+        "rev": "3c33a8aa466ea802355d704a17d600117ddea8d3",
         "type": "github"
       },
       "original": {
@@ -146,11 +146,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1776659114,
-        "narHash": "sha256-qapCOQmR++yZSY43dzrp3wCrkOTLpod+ONtJWBk6iKU=",
+        "lastModified": 1779676664,
+        "narHash": "sha256-MbXylBTkWqVm8/VYjoULtMoVRgWBN1gSHbeRKsOsPlU=",
         "owner": "pyproject-nix",
         "repo": "build-system-pkgs",
-        "rev": "ffaa2161dd5d63e0e94591f86b54fc239660fb2e",
+        "rev": "7bff980f37fc24e09dbc986643719900c139bf12",
         "type": "github"
       },
       "original": {
@@ -236,11 +236,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1778664018,
-        "narHash": "sha256-ogNyNANNLo0SMFevIeUpbTMOL9uUDu/hXvp7JlOYbwQ=",
+        "lastModified": 1779411315,
+        "narHash": "sha256-IMFlxeyClau51KplhhSRGhdGTvD/knShHdybP1UOTuk=",
         "owner": "pyproject-nix",
         "repo": "uv2nix",
-        "rev": "b48abe99ef639cd100c224898529370e5d935294",
+        "rev": "fdf2a76275d7a9c27deb5d2f2ab33526ac9052ff",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index c6c885734..fe44e3e6f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,7 +24,7 @@
       inputs.uv2nix.follows = "uv2nix";
     };
     ftditool = {
-      url = "github:lowRISC/ftditool?ref=v0.3.1";
+      url = "github:lowRISC/ftditool?ref=v0.4.0";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
diff --git a/util/fpga_runner.py b/util/fpga_runner.py
index 11c9ab82c..5b7bacd23 100755
--- a/util/fpga_runner.py
+++ b/util/fpga_runner.py
@@ -11,7 +11,6 @@
 
 import serial
 import serial.tools.list_ports
-from elftools.elf.elffile import ELFFile
 
 FTDI_PID: int = 0x6010
 BAUD_RATE: int = 1_000_000
@@ -71,39 +70,18 @@ async def bootstrap(uart: serial.Serial | None) -> None:
     await set_pin(0, True)
 
 
-def get_load_addr(elf: Path) -> int:
-    try:
-        with elf.open("rb") as f:
-            elf = ELFFile(f)
-            load_addrs = [
-                seg["p_paddr"] for seg in elf.iter_segments() if seg["p_type"] == "PT_LOAD"
-            ]
-            if not load_addrs:
-                print(f"[{RUNNER}] no PT_LOAD segments found in ELF file {elf}")
-                sys.exit(1)
-            return min(load_addrs)
-    except OSError as e:
-        print(f"[{RUNNER}] error opening ELF file {elf}: {e}")
-        sys.exit(1)
-
-
 async def load_fpga_binary(path: Path, uart: serial.Serial | None) -> None:
-    load_address = get_load_addr(path)
-
     await bootstrap(uart)
 
     command = [
         "ftditool",
         "--pid",
         hex(FTDI_PID),
-        "bootstrap",
-        "--addr",
-        hex(load_address),
-        "--skip-erase",
+        "bootstrap-elf",
+        str(path),
         "--ftdi",
         FTDI_DEVICE_DESC,
     ]
-    command.append(str(path.with_suffix(".bin")))
 
     p = await asyncio.create_subprocess_exec(*command)
     if await p.wait() != 0: