use version 4.0.0-nightly.20260128

Author: jialinli98

.github/workflows/benchmark.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install bb
         run: |
           curl -L https://raw.githubusercontent.com/AztecProtocol/aztec-packages/refs/heads/next/barretenberg/bbup/install | bash
-          ~/.bb/bbup -nv 1.0.0-beta.18
+          ~/.bb/bbup -v 4.0.0-nightly.20260128
           sudo apt install libc++-dev
 
       - name: Build Noir benchmark programs

.github/workflows/circuits_e2e.yaml

@@ -38,7 +38,7 @@ jobs:
       - name: Install Barretenberg
         run: |
           curl -L https://raw.githubusercontent.com/AztecProtocol/aztec-packages/refs/heads/next/barretenberg/bbup/install | bash
-          ~/.bb/bbup -nv 1.0.0-beta.18
+          ~/.bb/bbup -v 4.0.0-nightly.20260128
           sudo apt install libc++-dev
       - name: Compile Circuit
         run: |

.github/workflows/e2e_test.yaml

@@ -49,7 +49,7 @@ jobs:
       - name: Install Barretenberg
         run: |
           curl -L https://raw.githubusercontent.com/AztecProtocol/aztec-packages/refs/heads/next/barretenberg/bbup/install | bash
-          ~/.bb/bbup -nv 1.0.0-beta.18
+          ~/.bb/bbup -v 4.0.0-nightly.20260128
           sudo apt install libc++-dev
 
       - name: Generate Witnesses

ethereum/oracles/src/noir/circuit/barretenberg.ts

@@ -20,8 +20,21 @@ export interface ProofJsonOutput {
 }
 
 export class Barretenberg {
+  private static readonly EXPECTED_VERSION = '4.0.0-nightly.20260128';
+
   public static async create(): Promise<Barretenberg> {
     const binaryPath = path.join(os.homedir(), '.bb/bb');
+
+    // Verify bb version matches expected version
+    const { stdout } = await $`${binaryPath} --version`;
+    const installedVersion = stdout.trim();
+
+    if (installedVersion !== this.EXPECTED_VERSION) {
+      throw new Error(
+        `bb version mismatch: expected ${this.EXPECTED_VERSION}, found ${installedVersion}. Run: bbup -v ${this.EXPECTED_VERSION}`
+      );
+    }
+
     return new Barretenberg(binaryPath);
   }