diff --git a/entropy/nixos/flake.lock b/entropy/nixos/flake.lock
index 6ccab9c..e87359d 100644
--- a/entropy/nixos/flake.lock
+++ b/entropy/nixos/flake.lock
@@ -8,22 +8,22 @@
       },
       "locked": {
         "lastModified": 1,
-        "narHash": "sha256-h25YqRVPLnAurF22yqPcSM7p3LwuZRwNODaO4k7nl94=",
-        "path": "/nix/store/dnijhprbg3ixgn69fg48i25fns88w2yj-source/entropy/nixos/mlir",
+        "narHash": "sha256-MVU3QhAFlsLS5OmVonuYhubfqX5/47eG5QbNC5KDW1E=",
+        "path": "/nix/store/2fkslr44jwmmwjgymg3hks9rcjpcg9f6-source/entropy/nixos/mlir",
         "type": "path"
       },
       "original": {
-        "path": "/nix/store/dnijhprbg3ixgn69fg48i25fns88w2yj-source/entropy/nixos/mlir",
+        "path": "/nix/store/2fkslr44jwmmwjgymg3hks9rcjpcg9f6-source/entropy/nixos/mlir",
         "type": "path"
       }
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1673803274,
-        "narHash": "sha256-zaJDlHFXewT4KUsidMpRcPE+REymGH1Y3Eoc3Pjv4Xs=",
+        "lastModified": 1674550793,
+        "narHash": "sha256-ljJlIFQZwtBbzWqWTmmw2O5BFmQf1A/DspwMOQtGXHk=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "7bd6b87b3712e68007823e8dd5c37ee9b114fee3",
+        "rev": "b7ac0a56029e4f9e6743b9993037a5aaafd57103",
         "type": "github"
       },
       "original": {
@@ -35,11 +35,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1673957332,
-        "narHash": "sha256-njH7Szk1BLVWGMw7IRibgGejSlxXHj9saZHfH20gHdk=",
+        "lastModified": 1674333941,
+        "narHash": "sha256-jelQS56nVVFXGOZg6yUZ/3QWgU1Loa4Bzd4+TEPJX+c=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b83e7f5a04a3acc8e92228b0c4bae68933d504eb",
+        "rev": "339fc3dcc98f39d08496fb90c0d6b5fb81519246",
         "type": "github"
       },
       "original": {
diff --git a/entropy/nixos/mlir/flake.nix b/entropy/nixos/mlir/flake.nix
index 5839c6b..586dad2 100644
--- a/entropy/nixos/mlir/flake.nix
+++ b/entropy/nixos/mlir/flake.nix
@@ -7,11 +7,15 @@
   outputs = { self, nixpkgs }:
     let
 
+      # git revision to use (for version and git pull
+      gitRevision = "49caf7012170422afa84868598063818f9344228";
+
       # to work with older version of flakes
       lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
 
       # Generate a user-friendly version number.
       version = builtins.substring 0 8 lastModifiedDate;
+      # version = gitRevision;
 
       # System types to support.
       supportedSystems = [ "x86_64-linux" ]; #"x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
@@ -45,7 +49,7 @@
           src = fetchFromGitHub {
             owner = "llvm";
             repo = "llvm-project";
-            rev = "49caf7012170422afa84868598063818f9344228";
+            rev = gitRevision;
             sha256 = "sha256-j+ladpx8NfJGszj17oRkgvb4U2race+2DTKLtRZGeUM=";
           };