diff --git a/flake.lock b/flake.lock
index db33b95d6..e79908d7a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -80,15 +80,15 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1639363473,
-        "narHash": "sha256-PAEDC15ToLc3PW9fXi+qoR7VfPsZnmRWc6BssGGOWgg=",
-        "rev": "2c6601d97c111f07278b51272ffd1539847cad9f",
-        "revCount": 499,
+        "lastModified": 1639993482,
+        "narHash": "sha256-0mukHrr9o9EkQasf5MI7doLbYNS0o+2uo4V9wuSx5wc=",
+        "ref": "master",
+        "rev": "e2b44a066be5244ca044f643b57697aa962710dd",
+        "revCount": 508,
         "type": "git",
         "url": "https://git.m-labs.hk/M-Labs/nac3.git"
       },
       "original": {
-        "rev": "2c6601d97c111f07278b51272ffd1539847cad9f",
         "type": "git",
         "url": "https://git.m-labs.hk/M-Labs/nac3.git"
       }
diff --git a/flake.nix b/flake.nix
index ebe815413..b18762545 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
 
   inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
   inputs.src-sipyco = { url = github:m-labs/sipyco; flake = false; };
-  inputs.src-nac3 = { type = "git"; url = "https://git.m-labs.hk/M-Labs/nac3.git"; rev = "2c6601d97c111f07278b51272ffd1539847cad9f"; };
+  inputs.src-nac3 = { type = "git"; url = "https://git.m-labs.hk/M-Labs/nac3.git"; };
 
   inputs.src-migen = { url = github:m-labs/migen; flake = false; };
   inputs.src-misoc = { type = "git"; url = "https://github.com/m-labs/misoc.git"; submodules = true; flake = false; };