diff --git a/Cargo.toml b/Cargo.toml
index 51642ab3..0d5feab5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ u256 = { package = "primitive-types", version = "0.12.1" }
 enum_dispatch = "0.3"
 arbitrary = { version = "1", features = ["derive"], optional = true }
 zk_evm = { git = "https://github.com/matter-labs/era-zk_evm.git", branch = "v1.5.0", optional = true }
-anyhow = { optional = true }
+anyhow = { version = "1", optional = true }
 
 [dev-dependencies]
 divan = "0.1"
diff --git a/src/heap.rs b/src/heap.rs
index 4fc8103a..0d826838 100644
--- a/src/heap.rs
+++ b/src/heap.rs
@@ -20,6 +20,30 @@ impl HeapId {
 #[derive(Debug, Clone, PartialEq)]
 pub struct Heap(Vec<u8>);
 
+impl Heap {
+    pub fn resize(&mut self, new_len: usize, value: u8) {
+        self.0.resize(new_len, value);
+    }
+
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+}
+
+impl<Idx: std::slice::SliceIndex<[u8]>> std::ops::Index<Idx> for Heap {
+    type Output = Idx::Output;
+
+    fn index(&self, i: Idx) -> &Self::Output {
+        self.0.index(i)
+    }
+}
+
+impl<Idx: std::slice::SliceIndex<[u8]>> std::ops::IndexMut<Idx> for Heap {
+    fn index_mut(&mut self, i: Idx) -> &mut Self::Output {
+        self.0.index_mut(i)
+    }
+}
+
 impl HeapInterface for Heap {
     fn read_u256(&self, start_address: u32) -> U256 {
         self.read_u256_partially(start_address..start_address + 32)