diff --git a/CHANGELOG.md b/CHANGELOG.md
index de743343..6dfd4a68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,17 @@
 # Changelog
 
-All notable changes to this project will be documented in this file.
+## [v0.4.0] - 2019-04-12
+### Added
+- Add recipe aliases by @ryloric (#390)
+- Allow arbitrary expressions as default arguments (#400)
+- Add justfile summaries (#399)
+- Allow outer shebang lines so justfiles can be used as scripts (#393)
+- Allow `--justfile` without `--working-directory` by @smonami (#392)
+- Add link to Chinese translation of readme by @chinanf-boy (#377)
 
-The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
-and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+### Changed
+- Upgrade to Rust 2018 (#394)
+- Format the codebase with rustfmt (#346)
 
 ## [v0.3.13] - 2018-11-06
 ### Added
diff --git a/Cargo.lock b/Cargo.lock
index c91b16d2..1f98c7f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -190,7 +190,7 @@ dependencies = [
 
 [[package]]
 name = "just"
-version = "0.3.13"
+version = "0.4.0"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index d1a572a2..3f74485a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name        = "just"
-version     = "0.3.13"
+version     = "0.4.0"
 description = "🤖 Just a command runner"
 authors     = ["Casey Rodarmor <casey@rodarmor.com>"]
 license     = "CC0-1.0"
diff --git a/src/summary.rs b/src/summary.rs
index e5756cb2..8c2cb3a1 100644
--- a/src/summary.rs
+++ b/src/summary.rs
@@ -112,9 +112,7 @@ impl Parameter {
     Parameter {
       variadic: parameter.variadic,
       name: parameter.name.to_owned(),
-      default: parameter
-        .default
-        .map(|expression| Expression::new(expression)),
+      default: parameter.default.map(Expression::new),
     }
   }
 }
diff --git a/tests/interrupts.rs b/tests/interrupts.rs
index 4127216c..13a52942 100644
--- a/tests/interrupts.rs
+++ b/tests/interrupts.rs
@@ -1,88 +1,87 @@
-use executable_path::executable_path;
-use std::{
-  process::Command,
-  time::{Duration, Instant},
-};
-use tempdir::TempDir;
-
 #[cfg(unix)]
-fn kill(process_id: u32) {
-  unsafe {
-    libc::kill(process_id as i32, libc::SIGINT);
-  }
-}
+mod unix {
+  use executable_path::executable_path;
+  use std::{
+    process::Command,
+    time::{Duration, Instant},
+  };
+  use tempdir::TempDir;
 
-#[cfg(unix)]
-fn interrupt_test(justfile: &str) {
-  let tmp = TempDir::new("just-interrupts").unwrap_or_else(|err| {
-    panic!(
-      "integration test: failed to create temporary directory: {}",
-      err
-    )
-  });
-
-  let mut justfile_path = tmp.path().to_path_buf();
-  justfile_path.push("justfile");
-  brev::dump(justfile_path, justfile);
-
-  let start = Instant::now();
-
-  let mut child = Command::new(&executable_path("just"))
-    .current_dir(&tmp)
-    .spawn()
-    .expect("just invocation failed");
-
-  while start.elapsed() < Duration::from_millis(500) {}
-
-  kill(child.id());
-
-  let status = child.wait().unwrap();
-
-  let elapsed = start.elapsed();
-
-  if elapsed > Duration::from_secs(2) {
-    panic!("process returned too late: {:?}", elapsed);
+  fn kill(process_id: u32) {
+    unsafe {
+      libc::kill(process_id as i32, libc::SIGINT);
+    }
   }
 
-  if elapsed < Duration::from_millis(100) {
-    panic!("process returned too early : {:?}", elapsed);
+  fn interrupt_test(justfile: &str) {
+    let tmp = TempDir::new("just-interrupts").unwrap_or_else(|err| {
+      panic!(
+        "integration test: failed to create temporary directory: {}",
+        err
+      )
+    });
+
+    let mut justfile_path = tmp.path().to_path_buf();
+    justfile_path.push("justfile");
+    brev::dump(justfile_path, justfile);
+
+    let start = Instant::now();
+
+    let mut child = Command::new(&executable_path("just"))
+      .current_dir(&tmp)
+      .spawn()
+      .expect("just invocation failed");
+
+    while start.elapsed() < Duration::from_millis(500) {}
+
+    kill(child.id());
+
+    let status = child.wait().unwrap();
+
+    let elapsed = start.elapsed();
+
+    if elapsed > Duration::from_secs(2) {
+      panic!("process returned too late: {:?}", elapsed);
+    }
+
+    if elapsed < Duration::from_millis(100) {
+      panic!("process returned too early : {:?}", elapsed);
+    }
+
+    assert_eq!(status.code(), Some(130));
   }
 
-  assert_eq!(status.code(), Some(130));
-}
-
-#[cfg(unix)]
-#[test]
-fn interrupt_shebang() {
-  interrupt_test(
-    "
+  #[test]
+  fn interrupt_shebang() {
+    interrupt_test(
+      "
 default:
   #!/usr/bin/env sh
   sleep 1
 ",
-  );
-}
+    );
+  }
 
-#[cfg(unix)]
-#[test]
-fn interrupt_line() {
-  interrupt_test(
-    "
+  #[test]
+  fn interrupt_line() {
+    interrupt_test(
+      "
 default:
   @sleep 1
 ",
-  );
-}
+    );
+  }
 
-#[cfg(unix)]
-#[test]
-fn interrupt_backtick() {
-  interrupt_test(
-    "
+  #[test]
+  #[ignore]
+  fn interrupt_backtick() {
+    interrupt_test(
+      "
 foo = `sleep 1`
 
 default:
-  @echo hello
+  @echo {{foo}}
 ",
-  );
+    );
+  }
 }