diff --git a/crates/coffee/Cargo.toml b/crates/coffee/Cargo.toml
index 8a551f0..d72e53c 100644
--- a/crates/coffee/Cargo.toml
+++ b/crates/coffee/Cargo.toml
@@ -3,10 +3,14 @@ name = "coffee"
 version = "0.1.0"
 edition = "2021"
 
+[features]
+default = ["file-input"]
+file-input = ["dep:polars"]
+
 [dependencies]
-ndarray = { version = "0.16.1", features = ["rayon"] }
+ndarray = { version = "0.17", features = ["rayon"] }
 csv = "1.1.6"
-polars = { version = "0.23.2", features = ["csv-file"] }
+polars = { version = "0.23.2", features = ["csv-file"], optional = true }
 nalgebra = "0.33.2"
 chrono = "0.4"
 approx = "0.5.1"
diff --git a/crates/coffee/src/lib.rs b/crates/coffee/src/lib.rs
index 5d6f661..b0511fa 100644
--- a/crates/coffee/src/lib.rs
+++ b/crates/coffee/src/lib.rs
@@ -1,24 +1,37 @@
 pub mod extras;
+#[cfg(feature = "file-input")]
 pub mod fileparse;
 pub mod format;
 pub mod optimize;
 pub mod steihaug;
 
+#[cfg(feature = "file-input")]
 use std::fs::File;
+#[cfg(feature = "file-input")]
 use std::io::Read;
 
+#[cfg(feature = "file-input")]
 use extras::{OptimizerArgs, OptimizerResults};
+#[cfg(feature = "file-input")]
 use fileparse::{parse_float, read_inputs_to_dataframe};
+#[cfg(feature = "file-input")]
 use format::results_message;
+#[cfg(feature = "file-input")]
 use ndarray::{Array1, Array2};
+#[cfg(feature = "file-input")]
 use optimize::Optimizer;
 
+#[cfg(feature = "file-input")]
 use core::result::Result;
+#[cfg(feature = "file-input")]
 use std::error::Error;
+#[cfg(feature = "file-input")]
 use std::io::Write;
 
+#[cfg(feature = "file-input")]
 use polars::prelude::DataType;
 
+#[cfg(feature = "file-input")]
 fn run_coffee_computation(
     cfe_bytes: &[u8],
     con_bytes: &[u8],
@@ -78,6 +91,7 @@ fn run_coffee_computation(
     Ok(optimizer.get_results())
 }
 
+#[cfg(feature = "file-input")]
 pub fn run_coffee_server(cfe_bytes: &[u8], con_bytes: &[u8]) -> Result<String, Box<dyn Error>> {
     let args = OptimizerArgs {
         use_terminal: true, // print to logs for websocket version
@@ -95,6 +109,7 @@ pub fn run_coffee_server(cfe_bytes: &[u8], con_bytes: &[u8]) -> Result<String, B
     Ok(results_message(&optimizer_results))
 }
 
+#[cfg(feature = "file-input")]
 pub fn run_coffee(
     file_path_cfe: &str,
     file_path_con: &str,