diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..41116a0
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "rust-analyzer.linkedProjects": [
+        "native/xler_native/Cargo.toml"
+    ]
+}
\ No newline at end of file
diff --git a/config/config.exs b/config/config.exs
index 70c1dba..694ce2e 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -1,6 +1,6 @@
 # This file is responsible for configuring your application
 # and its dependencies with the aid of the Mix.Config module.
-use Mix.Config
+import Config
 
 # This configuration is loaded before any dependency and is restricted
 # to this project. If another project depends on this project, this
diff --git a/mix.exs b/mix.exs
index 0f0bc70..600c3d3 100644
--- a/mix.exs
+++ b/mix.exs
@@ -7,7 +7,7 @@ defmodule Xler.MixProject do
       version: "0.6.0",
       elixir: "~> 1.8",
       start_permanent: Mix.env() == :prod,
-      compilers: [:rustler] ++ Mix.compilers(),
+      compilers: Mix.compilers(),
       description: description(),
       package: package(),
       rustler_crates: rustler_crates(),
@@ -35,7 +35,7 @@ defmodule Xler.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps() do
     [
-      {:rustler, "~> 0.23.0"},
+      {:rustler, "~> 0.34.0"},
       {:ex_doc, ">= 0.0.0", only: :dev}
     ]
   end
diff --git a/mix.lock b/mix.lock
index 71e2ab2..5bd6a51 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,12 +1,21 @@
 %{
+  "castore": {:hex, :castore, "1.0.8", "dedcf20ea746694647f883590b82d9e96014057aff1d44d03ec90f36a5c0dc6e", [:mix], [], "hexpm", "0b2b66d2ee742cb1d9cb8c8be3b43c3a70ee8651f37b75a8b982e036752983f1"},
   "earmark": {:hex, :earmark, "1.4.4", "4821b8d05cda507189d51f2caeef370cf1e18ca5d7dfb7d31e9cafe6688106a4", [:mix], [], "hexpm", "1f93aba7340574847c0f609da787f0d79efcab51b044bb6e242cae5aca9d264d"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.31", "a93921cdc6b9b869f519213d5bc79d9e218ba768d7270d46fdcf1c01bacff9e2", [:mix], [], "hexpm", "317d367ee0335ef037a87e46c91a2269fef6306413f731e8ec11fc45a7efd059"},
   "ex_doc": {:hex, :ex_doc, "0.29.3", "f07444bcafb302db86e4f02d8bbcd82f2e881a0dcf4f3e4740e4b8128b9353f7", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "3dc6787d7b08801ec3b51e9bd26be5e8826fbf1a17e92d1ebc252e1a1c75bfe1"},
-  "jason": {:hex, :jason, "1.3.0", "fa6b82a934feb176263ad2df0dbd91bf633d4a46ebfdffea0c8ae82953714946", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "53fc1f51255390e0ec7e50f9cb41e751c260d065dcba2bf0d08dc51a4002c2ac"},
+  "finch": {:hex, :finch, "0.18.0", "944ac7d34d0bd2ac8998f79f7a811b21d87d911e77a786bc5810adb75632ada4", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6 or ~> 1.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "69f5045b042e531e53edc2574f15e25e735b522c37e2ddb766e15b979e03aa65"},
+  "hpax": {:hex, :hpax, "1.0.0", "28dcf54509fe2152a3d040e4e3df5b265dcb6cb532029ecbacf4ce52caea3fd2", [:mix], [], "hexpm", "7f1314731d711e2ca5fdc7fd361296593fc2542570b3105595bb0bc6d0fad601"},
+  "jason": {:hex, :jason, "1.4.4", "b9226785a9aa77b6857ca22832cffa5d5011a667207eb2a0ad56adb5db443b8a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "c5eb0cab91f094599f94d55bc63409236a8ec69a21a67814529e8d5f6cc90b3b"},
   "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.0", "f8c570a0d33f8039513fbccaf7108c5d750f47d8defd44088371191b76492b0b", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "28b2cbdc13960a46ae9a8858c4bebdec3c9a6d7b4b9e7f4ed1502f8159f338e7"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.1", "3fcb7f09eb9d98dc4d208f49cc955a34218fc41ff6b84df7c75b3e6e533cc65f", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "174d0809e98a4ef0b3309256cbf97101c6ec01c4ab0b23e926a9e17df2077cbb"},
+  "mime": {:hex, :mime, "2.0.6", "8f18486773d9b15f95f4f4f1e39b710045fa1de891fada4516559967276e4dc2", [:mix], [], "hexpm", "c9945363a6b26d747389aac3643f8e0e09d30499a138ad64fe8fd1d13d9b153e"},
+  "mint": {:hex, :mint, "1.6.2", "af6d97a4051eee4f05b5500671d47c3a67dac7386045d87a904126fd4bbcea2e", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1 or ~> 0.2.0 or ~> 1.0", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "5ee441dffc1892f1ae59127f74afe8fd82fda6587794278d924e4d90ea3d63f9"},
+  "nimble_options": {:hex, :nimble_options, "1.1.1", "e3a492d54d85fc3fd7c5baf411d9d2852922f66e69476317787a7b2bb000a61b", [:mix], [], "hexpm", "821b2470ca9442c4b6984882fe9bb0389371b8ddec4d45a9504f00a66f650b44"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.2.3", "244836e6e3f1200c7f30cb56733fd808744eca61fd182f731eac4af635cc6d0b", [:mix], [], "hexpm", "c8d789e39b9131acf7b99291e93dae60ab48ef14a7ee9d58c6964f59efb570b0"},
-  "rustler": {:hex, :rustler, "0.23.0", "87162ffdf5a46b6aa03d624a77367070ff1263961ae35332c059225e136c4a87", [:mix], [{:jason, "~> 1.2", [hex: :jason, repo: "hexpm", optional: false]}, {:toml, "~> 0.5.2", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "f5ab6f0ec564f5569009c0f5685b0e5b379fd72655e82a8dc5a3c24f9fdda36a"},
-  "toml": {:hex, :toml, "0.5.2", "e471388a8726d1ce51a6b32f864b8228a1eb8edc907a0edf2bb50eab9321b526", [:mix], [], "hexpm", "f1e3dabef71fb510d015fad18c0e05e7c57281001141504c6b69d94e99750a07"},
+  "nimble_pool": {:hex, :nimble_pool, "1.1.0", "bf9c29fbdcba3564a8b800d1eeb5a3c58f36e1e11d7b7fb2e084a643f645f06b", [:mix], [], "hexpm", "af2e4e6b34197db81f7aad230c1118eac993acc0dae6bc83bac0126d4ae0813a"},
+  "req": {:hex, :req, "0.5.4", "e375e4812adf83ffcf787871d7a124d873e983e3b77466e6608b973582f7f837", [:mix], [{:brotli, "~> 0.3.1", [hex: :brotli, repo: "hexpm", optional: true]}, {:ezstd, "~> 1.0", [hex: :ezstd, repo: "hexpm", optional: true]}, {:finch, "~> 0.17", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mime, "~> 2.0.6 or ~> 2.1", [hex: :mime, repo: "hexpm", optional: false]}, {:nimble_csv, "~> 1.0", [hex: :nimble_csv, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "a17998ffe2ef54f79bfdd782ef9f4cbf987d93851e89444cbc466a6a25eee494"},
+  "rustler": {:hex, :rustler, "0.34.0", "e9a73ee419fc296a10e49b415a2eb87a88c9217aa0275ec9f383d37eed290c1c", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:req, "~> 0.5", [hex: :req, repo: "hexpm", optional: false]}, {:toml, "~> 0.6", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "1d0c7449482b459513003230c0e2422b0252245776fe6fd6e41cb2b11bd8e628"},
+  "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
+  "toml": {:hex, :toml, "0.7.0", "fbcd773caa937d0c7a02c301a1feea25612720ac3fa1ccb8bfd9d30d822911de", [:mix], [], "hexpm", "0690246a2478c1defd100b0c9b89b4ea280a22be9a7b313a8a058a2408a2fa70"},
 }
diff --git a/native/xler_native/.gitignore b/native/xler_native/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/native/xler_native/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/native/xler_native/Cargo.lock b/native/xler_native/Cargo.lock
index 2508795..6093c0c 100644
--- a/native/xler_native/Cargo.lock
+++ b/native/xler_native/Cargo.lock
@@ -1,11 +1,22 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "adler32"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d2e7343e7fc9de883d1b0341e0b13970f764c14101234857d2ddafa1cb1cac2"
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.3.4"
@@ -74,12 +85,15 @@ dependencies = [
 
 [[package]]
 name = "heck"
-version = "0.3.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
-dependencies = [
- "unicode-segmentation",
-]
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
+[[package]]
+name = "inventory"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f958d3d68f4167080a18141e10381e7634563984a537f2a49a30fd8e53ac5767"
 
 [[package]]
 name = "lazy_static"
@@ -119,11 +133,11 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.23"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51ef7cd2518ead700af67bf9d1a658d90b6037d77110fd9c0445429d0ba1c6c9"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
- "unicode-xid",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -138,42 +152,61 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.7"
+version = "1.0.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
-name = "rustler"
-version = "0.23.0"
+name = "regex"
+version = "1.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ac79e5fcfae809c16ff8da548daa291933b7ec8d66eadc197cdccec46891625"
+checksum = "2a26af418b574bd56588335b3a3659a65725d4e636eb1016c2f9e3b38c7cc759"
 dependencies = [
- "lazy_static",
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
+[[package]]
+name = "rustler"
+version = "0.34.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e94bdfa68c0388cbd725f1ca54e975956482c262599e5cced04a903eec918b7f"
+dependencies = [
+ "inventory",
  "rustler_codegen",
  "rustler_sys",
 ]
 
 [[package]]
 name = "rustler_codegen"
-version = "0.23.0"
+version = "0.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10d303c303a145c1f3d2a2993527128badb9500101070c55e36ef9bb2417666a"
+checksum = "996dc019acb78b91b4e0c1bd6fa2cd509a835d309de762dc15213b97eac399da"
 dependencies = [
  "heck",
+ "inventory",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
 name = "rustler_sys"
-version = "2.1.0"
+version = "2.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fb96034ff33723615fd19223d58c987c1f6476342e83557a6e467ef95f83bda"
+checksum = "3914a75a147934353c3772a77b774c79fdf80ba84e8347f52a50df0c164aaff2"
 dependencies = [
+ "regex",
  "unreachable",
 ]
 
@@ -194,6 +227,17 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "syn"
+version = "2.0.72"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc4b9b9bf2add8093d3f2c0204471e951b2285580335de42f9d2534f3ae7a8af"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.20"
@@ -211,14 +255,14 @@ checksum = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.42",
 ]
 
 [[package]]
-name = "unicode-segmentation"
-version = "1.6.0"
+name = "unicode-ident"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "unicode-xid"
diff --git a/native/xler_native/Cargo.toml b/native/xler_native/Cargo.toml
index 1ad2223..4d5294e 100644
--- a/native/xler_native/Cargo.toml
+++ b/native/xler_native/Cargo.toml
@@ -9,6 +9,6 @@ path = "src/lib.rs"
 crate-type = ["dylib"]
 
 [dependencies]
-rustler = "0.23.0"
+rustler = "0.34.0"
 lazy_static = "1.4"
 calamine = "0.18.0"
\ No newline at end of file
diff --git a/native/xler_native/src/lib.rs b/native/xler_native/src/lib.rs
index fcf5bc1..242eb86 100644
--- a/native/xler_native/src/lib.rs
+++ b/native/xler_native/src/lib.rs
@@ -1,77 +1,61 @@
-#[macro_use] extern crate rustler;
-extern crate lazy_static;
 extern crate calamine;
+extern crate lazy_static;
+extern crate rustler;
 
-use rustler::{Env, NifResult, Encoder, Term, SchedulerFlags};
-use calamine::{Reader, open_workbook_auto};
 use calamine::Error as CaError;
+use calamine::{open_workbook_auto, Reader};
 
+rustler::init!("Elixir.Xler.Native");
 mod atoms {
-    rustler_atoms! {
-        atom ok;
-        atom error;
+    rustler::atoms! {
+        ok,
+        error,
 
         // Posix
-        atom enoent; // File does not exist
-        atom eacces; // Permission denied
-        atom epipe;  // Broken pipe
-        atom eexist; // File exists
+        enoent, // File does not exist
+        eacces, // Permission denied
+        epipe,  // Broken pipe
+        eexist, // File exists
     }
 }
 
-rustler_export_nifs! {
-    "Elixir.Xler.Native",
-    [
-        ("parse", 2, parse, SchedulerFlags::DirtyCpu),
-        ("worksheets", 1, worksheets, SchedulerFlags::DirtyCpu)
-    ],
-    None
-}
+type Sheet = Vec<Vec<String>>;
+type SheetName = String;
+type Worksheets = Vec<SheetName>;
 
-fn io_error_to_term<'a>(env: Env<'a>, err: &CaError) -> Term<'a> {
+fn io_error_to_term(err: &CaError) -> String {
     let error = match err {
-        _ => format!("{}", err).encode(env),
+        _ => format!("{}", err),
     };
 
-    (atoms::error(), error).encode(env)
+    error
 }
 
-fn worksheets<'a>(env: Env<'a>, args: &[Term<'a>]) -> NifResult<Term<'a>> {
-    let filename: String = args[0].decode()?;
-
+#[rustler::nif(schedule = "DirtyCpu")]
+fn worksheets(filename: String) -> Result<Worksheets, String> {
     match open_workbook_auto(&filename) {
-        Err(ref error) => return Ok(io_error_to_term(env, error)),
-        Ok(ref inner) => Ok((atoms::ok(), inner.sheet_names().to_owned()).encode(env)),
+        Err(ref error) => Err(io_error_to_term(error)),
+        Ok(ref inner) => Ok(inner.sheet_names().to_owned()),
     }
 }
 
-
-fn parse<'a>(env: Env<'a>, args: &[Term<'a>]) -> NifResult<Term<'a>> {
-    let filename: String = args[0].decode()?;
-    let sheetname: String = args[1].decode()?;
-
+#[rustler::nif(schedule = "DirtyCpu")]
+fn parse(filename: String, sheetname: SheetName) -> Result<Sheet, String> {
     let mut excel = match open_workbook_auto(&filename) {
-        Err(ref error) => return Ok(io_error_to_term(env, error)),
+        Err(ref error) => return Err(io_error_to_term(error)),
         Ok(inner) => inner,
     };
 
     if let Some(Ok(range)) = excel.worksheet_range(&sheetname) {
-        let row: Vec<(Vec<String>)> = range
-                        .rows()
-                        .into_iter()
-                        .enumerate()
-                        .map(|(_i, col)|
-                            col
-                            .iter()
-                            .map(|c|
-                                c.to_string()
-                            )
-                            .collect::<Vec<_>>()
-                        )
-                        .collect::<Vec<_>>();
+        let row: Sheet = range
+            .rows()
+            .into_iter()
+            .enumerate()
+            .map(|(_i, col)| col.iter().map(|c| c.to_string()).collect::<Vec<_>>())
+            .collect::<Vec<_>>();
 
-        Ok((atoms::ok(), row.encode(env)).encode(env))
+        Ok(row)
     } else {
-        Ok((atoms::error(), "Couldnt find the worksheet").encode(env))
+        Err("Couldnt find the worksheet".to_string())
     }
 }