diff --git a/Cargo.toml b/Cargo.toml
index 313f833f9..294a457b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,6 @@ version = "0.1.0"
 
 [workspace.dependencies]
 anyhow = "1"
-cairo-felt = "0.9"
 cairo-lang-casm = { git = "https://github.com/starkware-libs/cairo/", version = "~2.8.2"}
 cairo-lang-runner = { git = "https://github.com/starkware-libs/cairo/", version = "~2.8.2"}
 cairo-lang-sierra = { git = "https://github.com/starkware-libs/cairo/", version = "~2.8.2"}
@@ -20,5 +19,6 @@ num-bigint = "0.4.4"
 runner = { path = "runner" }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+starknet-types-core = "0.1.5"
 swiftness_proof_parser = { git = "https://github.com/iosis-tech/swiftness", rev = "a53d65ecbd7acf4611b0d587d815f4e9d4d493ed"}
 thiserror = "1.0"
\ No newline at end of file
diff --git a/benches/Cargo.toml b/benches/Cargo.toml
index 83e806f79..cfae45f2b 100644
--- a/benches/Cargo.toml
+++ b/benches/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2021"
 
 [dependencies]
 anyhow.workspace = true
-cairo-felt.workspace = true
 cairo-lang-runner.workspace = true
 cairo-lang-sierra.workspace = true
 cairo-lang-utils.workspace = true
diff --git a/runner/Cargo.toml b/runner/Cargo.toml
index 083db7100..4c5cec960 100644
--- a/runner/Cargo.toml
+++ b/runner/Cargo.toml
@@ -7,7 +7,6 @@ edition.workspace = true
 
 [dependencies]
 anyhow.workspace = true
-cairo-felt.workspace = true
 cairo-lang-casm.workspace = true
 cairo-lang-runner.workspace = true
 cairo-lang-sierra.workspace = true
@@ -18,5 +17,6 @@ itertools.workspace = true
 num-bigint.workspace = true
 serde_json.workspace = true
 serde.workspace = true
+starknet-types-core.workspace = true
 swiftness_proof_parser.workspace = true
 thiserror.workspace = true
\ No newline at end of file
diff --git a/runner/src/lib.rs b/runner/src/lib.rs
index c2ef97781..4e920cde5 100644
--- a/runner/src/lib.rs
+++ b/runner/src/lib.rs
@@ -1,7 +1,7 @@
 pub mod transform;
 pub mod vec252;
 
-use cairo_felt::Felt252;
+use cairo_vm::Felt252;
 use clap::ValueEnum;
 pub use vec252::VecFelt252;
 
@@ -48,4 +48,4 @@ impl From<HasherBitLength> for Felt252 {
             HasherBitLength::Lsb248 => Felt252::from(1),
         }
     }
-}
\ No newline at end of file
+}
diff --git a/runner/src/vec252.rs b/runner/src/vec252.rs
index b6e69540c..a3786a84a 100644
--- a/runner/src/vec252.rs
+++ b/runner/src/vec252.rs
@@ -1,4 +1,4 @@
-use cairo_felt::Felt252;
+use cairo_vm::Felt252;
 use serde::{de::Visitor, Deserialize};
 use serde_json::Value;
 use std::{ops::Deref, str::FromStr};
@@ -12,6 +12,8 @@ pub enum VecFelt252Error {
     BigIntParseError(#[from] num_bigint::ParseBigIntError),
     #[error("number out of range")]
     NumberOutOfRange,
+    #[error("failed to parse felt: {0}")]
+    FeltParseError(#[from] starknet_types_core::felt::FromStrError),
 }
 
 /// `VecFelt252` is a wrapper around a vector of `Arg`.
@@ -77,8 +79,7 @@ impl VecFelt252 {
                     args.push(Felt252::from(n));
                 }
                 Value::String(n) => {
-                    let n = num_bigint::BigUint::from_str(n)?;
-                    args.push(Felt252::from_bytes_be(&n.to_bytes_be()));
+                    args.push(Felt252::from_str(n)?);
                 }
                 Value::Array(a) => {
                     args.push(Felt252::from(a.len()));