diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
index 5100a085..1c9c3125 100644
--- a/.github/workflows/checks.yaml
+++ b/.github/workflows/checks.yaml
@@ -6,7 +6,7 @@ on:
     tags:
       - 'v*'
   pull_request:
-    branches: [main]
+    branches: [boojum-integration]
   workflow_dispatch:
 
 jobs:
@@ -16,15 +16,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Install latest nightly
-        uses: dtolnay/rust-toolchain@stable
+      - name: Install rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: nightly
+          toolchain: nightly-2023-07-21
           components: rustfmt, clippy
 
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2
-
       - uses: actions/setup-node@v3
         with:
           node-version: 18.x
@@ -43,14 +40,11 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
-      
+
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: stable
-
-      - name: Rust Cache
-        uses: Swatinem/rust-cache@v2
+          toolchain: nightly-2023-07-21
 
       - name: Build Code
         run: make all
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index bdcadb5e..769804eb 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -44,8 +44,8 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@v3
-      - name: Get latest version of stable Rust
-        run: rustup update stable
+      - name: Set version of nightly Rust
+        run: rustup default nightly-2023-07-21
       - name: Install target
         run: rustup target add ${{ matrix.arch }}
       - uses: Swatinem/rust-cache@v2
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index ad01072b..540d52f8 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -2,11 +2,11 @@ name: run
 
 on:
   push:
-    branches: [main]
+    branches: [boojum-integration]
     tags:
       - 'v*'
   pull_request:
-    branches: [main]
+    branches: [boojum-integration]
   workflow_dispatch:
 jobs:
   test:
@@ -21,15 +21,12 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Install Rust
-      uses: dtolnay/rust-toolchain@stable
-      with: 
-        toolchain: stable
+      uses: actions-rust-lang/setup-rust-toolchain@v1
+      with:
+        toolchain: nightly-2023-07-21
 
-    - name: Cache Rust Dependencies
-      uses: Swatinem/rust-cache@v2
-    
     - name: Install cargo-nextest
-      run: cargo +stable install cargo-nextest
-        
+      run: cargo install cargo-nextest
+
     - name: Run tests
       run: cargo nextest run
diff --git a/e2e-tests/test/zks-apis.test.ts b/e2e-tests/test/zks-apis.test.ts
index 35770486..dde269d5 100644
--- a/e2e-tests/test/zks-apis.test.ts
+++ b/e2e-tests/test/zks-apis.test.ts
@@ -31,7 +31,7 @@ describe("zks_estimateFee", function () {
     const response: Fee = await provider.send("zks_estimateFee", [transaction]);
 
     // Assert
-    expect(ethers.BigNumber.from(response.gas_limit)).to.eql(ethers.BigNumber.from("1230957"), "Unexpected gas_limit");
+    expect(ethers.BigNumber.from(response.gas_limit)).to.eql(ethers.BigNumber.from("1231992"), "Unexpected gas_limit");
     expect(ethers.BigNumber.from(response.gas_per_pubdata_limit)).to.eql(
       ethers.BigNumber.from("4080"),
       "Unexpected gas_per_pubdata_limit"
diff --git a/src/node.rs b/src/node.rs
index fd1bb449..fe13acbc 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -478,14 +478,9 @@ impl<S: std::fmt::Debug + ForkSource> InMemoryNodeInner<S> {
         let execution_mode = TxExecutionMode::EstimateFee;
         let (mut batch_env, _) = self.create_l1_batch_env(storage.clone());
         batch_env.l1_gas_price = l1_gas_price;
-        let impersonating = if self
+        let impersonating = self
             .impersonated_accounts
-            .contains(&l2_tx.common_data.initiator_address)
-        {
-            true
-        } else {
-            false
-        };
+            .contains(&l2_tx.common_data.initiator_address);
         let system_env = self.create_system_env(
             self.system_contracts
                 .contracts_for_fee_estimate(impersonating)