diff --git a/entropy/nixos/configuration.nix b/entropy/nixos/configuration.nix
index 38268fb..dac47ff 100644
--- a/entropy/nixos/configuration.nix
+++ b/entropy/nixos/configuration.nix
@@ -230,6 +230,7 @@ in
 
     # provided by my own overlay
     mlir
+    circt
 
     ## I heard you like man pages?
     man-pages
@@ -241,7 +242,9 @@ in
     gitAndTools.gitui
     ## terminal, browsers, text editing, note taking
     alacritty
-    vscodium
+    # doesn't support the MLIR tooling from the marketplace :(
+    #unstable.vscodium
+    vscode
     neovim
     ghostwriter
     firefox-wayland
diff --git a/entropy/nixos/flake.lock b/entropy/nixos/flake.lock
index c15e9dd..2159fda 100644
--- a/entropy/nixos/flake.lock
+++ b/entropy/nixos/flake.lock
@@ -7,27 +7,27 @@
         ]
       },
       "locked": {
-        "lastModified": 1674815343,
-        "narHash": "sha256-M+ZzNzz3NXq+8ofYT6zCR17fyWm1VwBIpB/k0xUoT38=",
+        "lastModified": 1678827852,
+        "narHash": "sha256-V8+w7LI9LWIShDV+bD4bEBmemM4tpJv9U5JNe+71LJk=",
         "owner": "Feliix42",
         "repo": "mlir.nix",
-        "rev": "904defc1d01a7987ca4d0efe4f63489bca7a4b0f",
+        "rev": "dec3d6103757d4cdb9ea81162cfbc99fc3befd56",
         "type": "github"
       },
       "original": {
         "owner": "Feliix42",
-        "ref": "main",
+        "ref": "circt",
         "repo": "mlir.nix",
         "type": "github"
       }
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1677591639,
-        "narHash": "sha256-DMlAyge+u3K+JOFLA5YfdjqagdAYJf29YGBWpy5izg4=",
+        "lastModified": 1678397099,
+        "narHash": "sha256-5xq8YJe+h19TlD+EI4AE/3H3jcCcQ2AWU6CWBVc5tRc=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "77de4cd09db4dbee9551ed2853cfcf113d7dc5ce",
+        "rev": "556101ff85bd6e20900ec73ee525b935154bc8ea",
         "type": "github"
       },
       "original": {
@@ -39,11 +39,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1677624842,
-        "narHash": "sha256-4DF9DbDuK4/+KYx0L6XcPBeDHUFVCtzok2fWtwXtb5w=",
+        "lastModified": 1678761643,
+        "narHash": "sha256-tapXZvg6Kg5Fm7Fm6i+7cRC5Exp2lX7cgMrqsfrGhuc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d70f5cd5c3bef45f7f52698f39e7cc7a89daa7f0",
+        "rev": "c4aec3c021620d98861639946123214207e98344",
         "type": "github"
       },
       "original": {
diff --git a/entropy/nixos/flake.nix b/entropy/nixos/flake.nix
index 6693383..c170a4b 100644
--- a/entropy/nixos/flake.nix
+++ b/entropy/nixos/flake.nix
@@ -9,7 +9,8 @@
       #inputs.nixpkgs.follows = "nixpkgs";
     #};
     mlir = {
-      url = "github:Feliix42/mlir.nix/main";
+      #url = "github:Feliix42/mlir.nix/main";
+      url = "github:Feliix42/mlir.nix/circt";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };