diff --git a/Cargo.lock b/Cargo.lock
index bf56c86..ef43bff 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,7 +19,7 @@ checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
 [[package]]
 name = "aero2solver"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "anyhow",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index 692c33d..7e0f95b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "aero2solver"
 description = "Solve Aero2 captchas automatically"
 authors = ["nezu <nezu@nezu.cc>"]
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 [dependencies]
@@ -11,4 +11,4 @@ anyhow = "1.0"
 reqwest = { version = "0.11", default-features = false, features = ["blocking"] }
 tl = "0.7"
 image = "0.24"
-clap = { version = "4.4.7", features = ["derive", "string"] }
\ No newline at end of file
+clap = { version = "4.4.7", features = ["derive", "string", "env"] }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index bc589b2..914ecc6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,31 +18,31 @@ fn get_model_path(filename: &str) -> String {
 #[command(author, version, about, long_about = None)]
 struct Args {
     /// model configuration file.
-    #[arg(short = 'c', long, default_value_t = get_model_path("captcha.cfg"))]
+    #[arg(short = 'c', long, env = "AERO2_MODEL_CFG", default_value_t = get_model_path("captcha.cfg"))]
     model_cfg: String,
 
     /// model weights file.
-    #[arg(short = 'w', long, default_value_t = get_model_path("captcha.weights"))]
+    #[arg(short = 'w', long, env = "AERO2_WEIGHTS", default_value_t = get_model_path("captcha.weights"))]
     weights: String,
 
     /// model labels file.
-    #[arg(short = 'l', long, default_value_t = get_model_path("captcha.names"))]
+    #[arg(short = 'l', long, env = "AERO2_LABELS", default_value_t = get_model_path("captcha.names"))]
     labels: String,
 
     /// minimum confidence threshold for captcha detection (0.0 - 1.0).
-    #[arg(short = 't', long, default_value_t = 0.8)]
+    #[arg(short = 't', long, env = "AERO2_THRESHOLD", default_value_t = 0.8)]
     threshold: f32,
 
     /// time to wait after aero2 returns an error (in seconds).
-    #[arg(long, default_value_t = 5.0)]
+    #[arg(long, env = "AERO2_ERROR_DELAY", default_value_t = 10.0)]
     error_delay: f32,
 
     /// time to wait between checking for new captchas (in seconds).
-    #[arg(long, default_value_t = 10.0)]
+    #[arg(long, env = "AERO2_CHECK_DELAY", default_value_t = 10.0)]
     check_delay: f32,
 
     /// time to wait after successfully solving a captcha (in seconds).
-    #[arg(long, default_value_t = 55.0 * 60.0)]
+    #[arg(long, env = "AERO2_SOLVED_DELAY", default_value_t = 60.0)]
     solved_delay: f32,
 }