diff --git a/.github/workflows/build-bindings.yml b/.github/workflows/build-bindings.yml
new file mode 100644
index 000000000..6eb882795
--- /dev/null
+++ b/.github/workflows/build-bindings.yml
@@ -0,0 +1,23 @@
+# Purpose: We want to build the o1js bindings in CI so that people in the 
+# community can change them without being scared of breaking things, or
+# needing to do the complicated (without nix) build setup.
+
+name: Build o1js bindings
+
+on:
+  pull_request:
+
+jobs:  
+  nix-build:
+    name: build-bindings-ubuntu
+    runs-on: ubuntu-latest
+    steps:
+      - name: Disable smudging
+        run: echo "GIT_LFS_SKIP_SMUDGE=1" >> $GITHUB_ENV
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v30
+      - run: |
+          set -Eeu
+          export GIT_LFS_SKIP_SMUDGE=1
+          ./pin.sh
+          nix develop o1js --command bash --command "npm run build:update-bindings"
diff --git a/flake.lock b/flake.lock
index 79916af26..efab58dee 100644
--- a/flake.lock
+++ b/flake.lock
@@ -265,8 +265,8 @@
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1731611028,
-        "narHash": "sha256-sehBPO+H9mtShGb3KNhdDVHj0pogt/tmiL9tc2ICkaU=",
+        "lastModified": 1731681924,
+        "narHash": "sha256-RnTcGydbDBji5UDjcGzxui7+55JT0ZXdTNvuNOFXEkg=",
         "path": "src/mina",
         "type": "path"
       },
@@ -321,6 +321,26 @@
         "type": "github"
       }
     },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1729742964,
+        "narHash": "sha256-B4mzTcQ0FZHdpeWcpDYPERtyjJd/NIuaQ9+BV1h+MpA=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "e04df33f62cdcf93d73e9a04142464753a16db67",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
     "nix-npm-buildPackage": {
       "inputs": {
         "nixpkgs": [
@@ -561,6 +581,7 @@
         "dune-nix": "dune-nix",
         "flake-utils": "flake-utils",
         "mina": "mina",
+        "nix-github-actions": "nix-github-actions",
         "nixpkgs": "nixpkgs_3",
         "nixpkgs-mozilla": "nixpkgs-mozilla_2"
       }
diff --git a/flake.nix b/flake.nix
index 889fa5193..7e1b663df 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,8 +12,10 @@
     dune-nix.inputs.nixpkgs.follows = "nixpkgs";
     dune-nix.inputs.flake-utils.follows = "flake-utils";
     flake-utils.url = "github:numtide/flake-utils";
+    nix-github-actions.url = "github:nix-community/nix-github-actions";
+    nix-github-actions.inputs.nixpkgs.follows = "nixpkgs";
   };
-  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
+  outputs = { self, nixpkgs, nix-github-actions, flake-utils, ... }@inputs:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs= (nixpkgs.legacyPackages."${system}".extend