diff --git a/reference/nim/proof_input/proof_input.nimble b/reference/nim/proof_input/proof_input.nimble
index 794179e..114467c 100644
--- a/reference/nim/proof_input/proof_input.nimble
+++ b/reference/nim/proof_input/proof_input.nimble
@@ -7,5 +7,5 @@ srcDir        = "src"
 bin           = @["cli","testmain"]
 
 requires "nim >= 1.6.0"
-requires "https://github.com/mratsim/constantine"
-requires "https://github.com/codex-storage/nim-poseidon2#9be7b0c134e64e3d57a38520a32af93a55a37c44"
+requires "https://github.com/mratsim/constantine#ab6fa6ae1bbbd1b10071a92ec209b381b5d82511"
+requires "https://github.com/codex-storage/nim-poseidon2#8a54c69032a741160bbc097d009e45a8b5e4d718"
diff --git a/reference/nim/proof_input/src/testmain.nim b/reference/nim/proof_input/src/testmain.nim
index 803ec40..eeae932 100644
--- a/reference/nim/proof_input/src/testmain.nim
+++ b/reference/nim/proof_input/src/testmain.nim
@@ -6,6 +6,7 @@ import constantine/math/arithmetic
 
 import poseidon2/types
 import poseidon2/merkle
+import poseidon2/io
 
 import types
 import blocks
@@ -20,7 +21,7 @@ import json
 
 proc testMerkleProofs*( input: seq[F] ) = 
   let tree = merkleTree(input)
-  let root = merkleRoot(input)
+  let root = Merkle.digest(input)
   assert( bool(root == treeRoot(tree)) )
 
   let n  = input.len
diff --git a/reference/nim/testvectors/src/testvectors.nim b/reference/nim/testvectors/src/testvectors.nim
index c043542..688e0d2 100644
--- a/reference/nim/testvectors/src/testvectors.nim
+++ b/reference/nim/testvectors/src/testvectors.nim
@@ -53,7 +53,7 @@ proc testVectorsMerkle() =
   echo "-----------------------------------------------------"
   for n in 1..40:
     let input : seq[F] = collect( newSeq , (for i in 1..n: toF(i)) )
-    let root = merkleRoot(input)
+    let root = Merkle.digest(input)
     echo( "Merkle root of [1.." & ($n) & "] : seq[F] =  " & toDecimal(root) )
 
   echo ""
@@ -61,7 +61,7 @@ proc testVectorsMerkle() =
   echo "--------------------------------------------------------"
   for n in 0..80:
     let input : seq[byte] = collect( newSeq , (for i in 1..n: byte(i)) )
-    let root = merkleRoot(input)
+    let root = Merkle.digest(input)
     echo( "Merkle root of [1.." & ($n) & "] : seq[byte] =  " & toDecimal(root) )
 
 #-------------------------------------------------------------------------------
diff --git a/reference/nim/testvectors/testvectors.nimble b/reference/nim/testvectors/testvectors.nimble
index 7ac6ea9..57686e3 100644
--- a/reference/nim/testvectors/testvectors.nimble
+++ b/reference/nim/testvectors/testvectors.nimble
@@ -10,5 +10,5 @@ bin           = @["testvectors"]
 # Dependencies
 
 requires "nim >= 1.6.0"
-requires "https://github.com/mratsim/constantine"
-requires "https://github.com/codex-storage/nim-poseidon2#596f7b18070b44ca0bf305bf9bdf1dc4f6011181"
+requires "https://github.com/mratsim/constantine#ab6fa6ae1bbbd1b10071a92ec209b381b5d82511"
+requires "https://github.com/codex-storage/nim-poseidon2#8a54c69032a741160bbc097d009e45a8b5e4d718"