diff --git a/Cargo.lock b/Cargo.lock
index 97b19b0..e98ffe7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -100,6 +100,14 @@ dependencies = [
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "cloudabi"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "console"
 version = "0.6.1"
@@ -324,6 +332,23 @@ dependencies = [
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "redox_syscall"
 version = "0.1.40"
@@ -515,6 +540,18 @@ dependencies = [
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "term"
 version = "0.5.1"
@@ -664,7 +701,7 @@ dependencies = [
  "slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slog-term 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -718,6 +755,7 @@ dependencies = [
 "checksum chrono 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6962c635d530328acc53ac6a955e83093fedc91c5809dfac1fa60fa470830a37"
 "checksum clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b957d88f4b6a63b9d70d5f454ac8011819c6efa7727858f458ab71c756ce2d3e"
 "checksum clicolors-control 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1f84dec9bc083ce2503908cd305af98bd363da6f54bf8d4bf0ac14ee749ad5d1"
+"checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum console 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7649ca90478264b9686aac8d269fcb014f14c2bed7c79a7e51b9f6afd4d783eb"
 "checksum copy_dir 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6e4281031634644843bd2f5aa9c48cf98fc48d6b083bd90bb11becf10deaf8b0"
 "checksum dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6d301140eb411af13d3115f9a562c85cc6b541ade9dfa314132244aaee7489dd"
@@ -745,6 +783,8 @@ dependencies = [
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
 "checksum quote 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b71f9f575d55555aa9c06188be9d4e2bfc83ed02537948ac0d520c24d0419f1a"
 "checksum rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "eba5f8cb59cc50ed56be8880a5c7b496bfd9bd26394e176bc67884094145c2c5"
+"checksum rand 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "12397506224b2f93e6664ffc4f664b29be8208e5157d3d90b44f09b5fae470ea"
+"checksum rand_core 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "edecf0f94da5551fc9b492093e30b041a891657db7940ee221f9d2f66e82eef2"
 "checksum redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "c214e91d3ecf43e9a4e41e578973adeb14b474f2bee858742d127af75a0112b1"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9329abc99e39129fcceabd24cf5d85b4671ef7c29c50e972bc5afe32438ec384"
@@ -769,6 +809,7 @@ dependencies = [
 "checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
 "checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
+"checksum tempfile 3.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c4b103c6d08d323b92ff42c8ce62abcd83ca8efa7fd5bf7927efefec75f58c76"
 "checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"
 "checksum termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "adc4587ead41bf016f11af03e55a624c06568b5a19db4e90fde573d805074f83"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
diff --git a/Cargo.toml b/Cargo.toml
index 27ffbff..ac9cc02 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,4 +26,4 @@ toml = "0.4"
 
 [dev-dependencies]
 copy_dir = "0.1.2"
-tempdir = "0.3"
+tempfile = "3"
diff --git a/tests/all/main.rs b/tests/all/main.rs
index 7ab4e66..998588e 100644
--- a/tests/all/main.rs
+++ b/tests/all/main.rs
@@ -3,7 +3,7 @@ extern crate failure;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
-extern crate tempdir;
+extern crate tempfile;
 extern crate wasm_pack;
 
 mod manifest;
diff --git a/tests/all/utils.rs b/tests/all/utils.rs
index a661faf..2f70e29 100644
--- a/tests/all/utils.rs
+++ b/tests/all/utils.rs
@@ -1,7 +1,7 @@
 use std::path::{Path, PathBuf};
 
 use copy_dir::copy_dir;
-use tempdir;
+use tempfile;
 
 /// Copy the given fixture into a unique temporary directory. This allows the
 /// test to mutate the copied fixture without messing up other tests that are
@@ -12,14 +12,14 @@ pub fn fixture<P>(fixture: P) -> Fixture
 where
     P: AsRef<Path>,
 {
-    let dir = tempdir::TempDir::new("wasm-pack").expect("should create temporary directory OK");
-    let path = dir.path().join("fixture");
+    let dir = tempfile::tempdir().expect("should create temporary directory OK");
+    let path = dir.path().join("wasm-pack");
     copy_dir(fixture, &path).expect("should copy fixture directory into temporary directory OK");
     Fixture { dir, path }
 }
 
 pub struct Fixture {
-    pub dir: tempdir::TempDir,
+    pub dir: tempfile::TempDir,
     pub path: PathBuf,
 }