Index: env-logger/Cargo.toml
===================================================================
--- env-logger.orig/Cargo.toml
+++ env-logger/Cargo.toml
@@ -93,10 +93,6 @@ harness = false
 version = "2.0.0"
 optional = true
 
-[dependencies.is-terminal]
-version = "0.4.0"
-optional = true
-
 [dependencies.log]
 version = "0.4.8"
 features = ["std"]
@@ -116,7 +112,6 @@ optional = true
 
 [features]
 auto-color = [
-    "dep:is-terminal",
     "color",
 ]
 color = ["dep:termcolor"]
Index: env-logger/src/fmt/writer/atty.rs
===================================================================
--- env-logger.orig/src/fmt/writer/atty.rs
+++ env-logger/src/fmt/writer/atty.rs
@@ -8,7 +8,7 @@ printed.
 
 #[cfg(feature = "auto-color")]
 mod imp {
-    use is_terminal::IsTerminal;
+    use std::io::IsTerminal;
 
     pub(in crate::fmt) fn is_stdout() -> bool {
         std::io::stdout().is_terminal()