diff --git a/script/research/zkvm-metering/README.md b/script/research/zkvm-metering/README.md
index 84a4b6afb..9fcfa65af 100644
--- a/script/research/zkvm-metering/README.md
+++ b/script/research/zkvm-metering/README.md
@@ -39,7 +39,7 @@ Once the `heaptrack` report is generated you can view it using `heaptrack_gui`.
 | #  | Opcode                | RAM Usage | Verifying Key Size | Proof Size |
 |----|-----------------------|-----------|--------------------|------------|
 | 0  | sparse_merkle_root    | 17.1 MB   | 1.2 MB             | 7.7 kB     |
-| 1  | merkle_root           | 8.1 MB    | 572.2 kB           | 7.7 kB     |
+| 1  | merkle_root           | 2.4 MB    | 145.6 kB           | 7.6 kB     |
 | 2  | posedion_hash         | 2.4 MB    | 145.6 kB           | 7.6 kB     |
 | 3  | base_add              | 2.4 MB    | 145.6 kB           | 7.6 kB     |
 | 4  | base_mul              | 2.4 MB    | 145.6 kB           | 7.6 kB     |
diff --git a/script/research/zkvm-metering/generator/proof/merkle_root.zk b/script/research/zkvm-metering/generator/proof/merkle_root.zk
index 50c1fc2d4..6d4d2d857 100644
--- a/script/research/zkvm-metering/generator/proof/merkle_root.zk
+++ b/script/research/zkvm-metering/generator/proof/merkle_root.zk
@@ -1,4 +1,4 @@
-k = 13;
+k = 11;
 field = "pallas";
 
 constant "MerkleRoot" {