diff --git a/Cargo.lock b/Cargo.lock
index c770512..540b212 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -153,7 +153,7 @@ dependencies = [
  "cfg-if 1.0.0",
  "const_fn",
  "crossbeam-utils",
- "lazy_static 1.4.0",
+ "lazy_static",
  "memoffset",
  "scopeguard",
 ]
@@ -166,7 +166,7 @@ checksum = "02d96d1e189ef58269ebe5b97953da3274d83a93af647c2ddd6f9dab28cedb8d"
 dependencies = [
  "autocfg",
  "cfg-if 1.0.0",
- "lazy_static 1.4.0",
+ "lazy_static",
 ]
 
 [[package]]
@@ -242,12 +242,6 @@ dependencies = [
  "rayon",
 ]
 
-[[package]]
-name = "lazy_static"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76f033c7ad61445c5b347c7382dd1237847eb1bce590fe50365dcb33d546be73"
-
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -442,7 +436,7 @@ dependencies = [
  "crossbeam-channel",
  "crossbeam-deque",
  "crossbeam-utils",
- "lazy_static 1.4.0",
+ "lazy_static",
  "num_cpus",
 ]
 
@@ -475,9 +469,9 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "stderrlog"
-version = "0.4.3"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32e5ee9b90a5452c570a0b0ac1c99ae9498db7e56e33d74366de7f2a7add7f25"
+checksum = "b02f316286ae558d83acc93dd81eaba096e746987a7961d4a9ae026842bae67f"
 dependencies = [
  "atty",
  "chrono",
@@ -499,7 +493,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5277acd7ee46e63e5168a80734c9f6ee81b1367a7d8772a2d765df2a3705d28c"
 dependencies = [
  "clap",
- "lazy_static 1.4.0",
+ "lazy_static",
  "structopt-derive",
 ]
 
@@ -559,12 +553,11 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "0.3.4"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1697c4b57aeeb7a536b647165a2825faddffb1d3bad386d507709bd51a90bb14"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 dependencies = [
- "lazy_static 0.2.11",
- "unreachable",
+ "lazy_static",
 ]
 
 [[package]]
@@ -607,15 +600,6 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
-[[package]]
-name = "unreachable"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
-dependencies = [
- "void",
-]
-
 [[package]]
 name = "vec_map"
 version = "0.8.2"
@@ -628,12 +612,6 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
-[[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-
 [[package]]
 name = "wasi"
 version = "0.10.0+wasi-snapshot-preview1"
diff --git a/Cargo.toml b/Cargo.toml
index 1da5d2a..058dd6e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,8 +10,8 @@ authors = ["Michael Zhang <mail@mzhang.io>"]
 [dependencies]
 anyhow = "1.0.36"
 image = "0.23.12"
-log = "0.4.8"
-stderrlog = "0.4.3"
+log = "0.4.11"
+stderrlog = "0.5.0"
 xcb-util = { version = "0.3.0", features = ["image", "cursor"] }
-xcb = { version = "0.9" }
+xcb = "0.9.0"
 structopt = "0.3.21"
diff --git a/src/gui.rs b/src/gui.rs
index 78297ca..d76a589 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -1,27 +1,22 @@
 use std::path::Path;
-use std::ptr;
 
 use anyhow::Result;
-use image::{Bgra, ColorType, DynamicImage, ImageBuffer};
+use image::{Bgra, DynamicImage, ImageBuffer};
 use xcb::{
     base::Connection,
     xproto::{self, Rectangle},
     Screen,
 };
-use xcb_util::{ffi::image::*, image as xcb_image};
+use xcb_util::image as xcb_image;
 
 pub struct Gui {
     conn: Connection,
-    default_screen: i32,
 }
 
 impl Gui {
     pub fn new() -> Result<Self> {
-        let (conn, default_screen) = Connection::connect(None)?;
-        Ok(Gui {
-            conn,
-            default_screen,
-        })
+        let (conn, _) = Connection::connect(None)?;
+        Ok(Gui { conn })
     }
 
     fn get_default_screen(&self) -> Screen {
@@ -58,7 +53,7 @@ impl Gui {
         let root_window = screen.root();
         let (width, height) = (screen.width_in_pixels(), screen.height_in_pixels());
 
-        let window = xproto::create_window(
+        xproto::create_window(
             &self.conn,
             xcb::COPY_FROM_PARENT as u8,
             id,
diff --git a/src/main.rs b/src/main.rs
index 13179ff..18ae147 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -30,7 +30,7 @@ fn main() -> Result<()> {
         }
         Region::Selection => {
             let rectangle = gui.interactive_select(&capture)?;
-            capture.save_cropped_to(&opt.outfile, rectangle);
+            capture.save_cropped_to(&opt.outfile, rectangle)?;
         }
         _ => todo!("TODO"),
     }