diff --git a/Cargo.lock b/Cargo.lock
index 74e74b8..bf1a948 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,7 +107,6 @@ name = "sg"
 version = "0.1.0"
 dependencies = [
  "ansi_term",
- "atty",
  "cc",
  "clap",
  "rustc_tools_util",
diff --git a/Cargo.toml b/Cargo.toml
index 9cc9d7b..0efeb67 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,6 @@ repository = "https://github.com/osa1/sg"
 
 [dependencies]
 ansi_term = "0.12"
-atty = "0.2.14"
 clap = "2.33"
 tree-sitter = "0.20.6"
 
diff --git a/src/main.rs b/src/main.rs
index 53c6941..7a06bf1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,7 +4,7 @@ use std::borrow::Cow;
 use std::cell::RefCell;
 use std::ffi::OsString;
 use std::fs;
-use std::io::Write;
+use std::io::{IsTerminal, Write};
 use std::path::Path;
 
 use tree_sitter::{Language, Node, Parser};
@@ -122,7 +122,7 @@ where
         }
     };
 
-    if !nocolor && !assume_color_support && !atty::is(atty::Stream::Stdout) {
+    if !nocolor && !assume_color_support && !std::io::stdout().is_terminal() {
         nocolor = true;
     }