diff --git a/extensions/scarb-cairo-run/src/deserialization.rs b/extensions/scarb-cairo-run/src/deserialization.rs
index cd833a86b..5673626ee 100644
--- a/extensions/scarb-cairo-run/src/deserialization.rs
+++ b/extensions/scarb-cairo-run/src/deserialization.rs
@@ -15,7 +15,7 @@ pub enum ArgsError {
     #[error("failed to convert slice to array: {0}")]
     ArrayFromSlice(#[from] std::array::TryFromSliceError),
     #[error("number out of range")]
-    NumberOutOfRange,
+    NumberOutOfRange(#[from] starknet_types_core::felt::FromStrError),
     #[error("failed to parse arguments: {0}")]
     ParseError(#[from] serde_json::Error),
 }
@@ -91,8 +91,8 @@ impl Args {
         for arg in iterator {
             match arg {
                 Value::Number(n) => {
-                    let n = n.as_u64().ok_or(ArgsError::NumberOutOfRange)?;
-                    args.push(Arg::Value(Felt252::from(n)));
+                    let n = Felt252::from_str(n.to_string().as_str())?;
+                    args.push(Arg::Value(n));
                 }
                 Value::String(n) => {
                     let n = num_bigint::BigUint::from_str(n)?;
diff --git a/extensions/scarb-cairo-run/tests/arguments.rs b/extensions/scarb-cairo-run/tests/arguments.rs
index d7e5e3f55..1efd71bab 100644
--- a/extensions/scarb-cairo-run/tests/arguments.rs
+++ b/extensions/scarb-cairo-run/tests/arguments.rs
@@ -42,6 +42,35 @@ fn valid_number_of_args() {
         "#});
 }
 
+#[test]
+fn can_deserialize_big_number() {
+    let t = TempDir::new().unwrap();
+
+    ProjectBuilder::start()
+        .name("hello")
+        .version("0.1.0")
+        .lib_cairo(indoc! {r#"
+        fn main(n: felt252) -> felt252 {
+            n
+        }
+        "#})
+        .build(&t);
+
+    Scarb::quick_snapbox()
+        .arg("cairo-run")
+        .arg("--")
+        .arg(r#"[1129815197211541481934112806673325772687763881719835256646064516195041515616]"#)
+        .current_dir(&t)
+        .assert()
+        .success()
+        .stdout_matches(indoc! {r#"
+               Compiling hello v0.1.0 ([..]/Scarb.toml)
+                Finished release target(s) in [..]
+                 Running hello
+            Run completed successfully, returning [1129815197211541481934112806673325772687763881719835256646064516195041515616]
+        "#});
+}
+
 #[test]
 fn invalid_number_of_args() {
     let t = TempDir::new().unwrap();