diff --git a/Cargo.lock b/Cargo.lock
index dfaf50e..eb3fba5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1242,13 +1242,9 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "cargo_metadata 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "console 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "dialoguer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "human-panic 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "indicatif 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1258,17 +1254,29 @@ dependencies = [
  "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_ignored 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "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)",
  "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-pack-binary-install 0.1.0",
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-pack-binary-install"
+version = "0.1.0"
+dependencies = [
+ "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "zip 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 34e1727..dcf45e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,12 +13,8 @@ documentation = "https://rustwasm.github.io/wasm-pack/"
 atty = "0.2.11"
 cargo_metadata = "0.6.0"
 console = "0.6.1"
-curl = "0.4.13"
 dialoguer = "0.3.0"
-dirs = "1.0.4"
 failure = "0.1.2"
-flate2 = "1.0.2"
-hex = "0.3"
 human-panic = "1.0.1"
 glob = "0.2"
 indicatif = "0.9.0"
@@ -29,17 +25,15 @@ serde = "1.0.74"
 serde_derive = "1.0.74"
 serde_ignored = "0.0.4"
 serde_json = "1.0.26"
-siphasher = "0.2.3"
 slog = "2.3"
 slog-term = "2.4"
 slog-async = "2.3"
 strsim = "0.8.0"
 structopt = "0.2"
-tar = "0.4.16"
 toml = "0.4"
 which = "2.0.0"
+wasm-pack-binary-install = { version = "0.1.0", path = "./binary-install" }
 walkdir = "2"
-zip = "0.5.0"
 
 [dev-dependencies]
 tempfile = "3"
diff --git a/binary-install/Cargo.toml b/binary-install/Cargo.toml
new file mode 100644
index 0000000..76d71b1
--- /dev/null
+++ b/binary-install/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "wasm-pack-binary-install"
+version = "0.1.0"
+
+[dependencies]
+curl = "0.4.13"
+dirs = "1.0.4"
+failure = "0.1.2"
+flate2 = "1.0.2"
+hex = "0.3"
+siphasher = "0.2.3"
+tar = "0.4.16"
+zip = "0.5.0"
diff --git a/src/binaries.rs b/binary-install/src/lib.rs
similarity index 96%
rename from src/binaries.rs
rename to binary-install/src/lib.rs
index a34c872..dcef39f 100644
--- a/src/binaries.rs
+++ b/binary-install/src/lib.rs
@@ -1,10 +1,16 @@
 //! Utilities for finding and installing binaries that we depend on.
 
-use curl;
-use dirs;
+extern crate curl;
+#[macro_use]
+extern crate failure;
+extern crate dirs;
+extern crate flate2;
+extern crate hex;
+extern crate siphasher;
+extern crate tar;
+extern crate zip;
+
 use failure::{Error, ResultExt};
-use flate2;
-use hex;
 use siphasher::sip::SipHasher13;
 use std::collections::HashSet;
 use std::env;
@@ -13,8 +19,6 @@ use std::fs;
 use std::hash::{Hash, Hasher};
 use std::io;
 use std::path::{Path, PathBuf};
-use tar;
-use zip;
 
 /// Global cache for wasm-pack, currently containing binaries downloaded from
 /// urls like wasm-bindgen and such.
@@ -38,8 +42,7 @@ impl Cache {
             .or_else(|| {
                 let home = dirs::home_dir()?;
                 Some(home.join(".wasm-pack"))
-            })
-            .ok_or_else(|| format_err!("couldn't find your home directory, is $HOME not set?"))?;
+            }).ok_or_else(|| format_err!("couldn't find your home directory, is $HOME not set?"))?;
         Ok(Cache::at(&destination))
     }
 
diff --git a/src/bindgen.rs b/src/bindgen.rs
index 8282f6b..0a84950 100644
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@@ -1,6 +1,5 @@
 //! Functionality related to installing and running `wasm-bindgen`.
 
-use binaries::{Cache, Download};
 use child;
 use command::build::BuildProfile;
 use emoji;
@@ -12,6 +11,7 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 use target;
+use wasm_pack_binary_install::{Cache, Download};
 use which::which;
 use PBAR;
 
diff --git a/src/command/build.rs b/src/command/build.rs
index 4b00cca..0fbbff3 100644
--- a/src/command/build.rs
+++ b/src/command/build.rs
@@ -1,6 +1,5 @@
 //! Implementation of the `wasm-pack build` command.
 
-use binaries::{Cache, Download};
 use bindgen;
 use build;
 use command::utils::{create_pkg_dir, set_crate_path};
@@ -16,6 +15,7 @@ use slog::Logger;
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::Instant;
+use wasm_pack_binary_install::{Cache, Download};
 use PBAR;
 
 /// Everything required to configure and run the `wasm-pack init` command.
diff --git a/src/command/test.rs b/src/command/test.rs
index 92633dd..81e5c2b 100644
--- a/src/command/test.rs
+++ b/src/command/test.rs
@@ -1,7 +1,6 @@
 //! Implementation of the `wasm-pack test` command.
 
 use super::build::BuildMode;
-use binaries::Cache;
 use bindgen;
 use build;
 use command::utils::set_crate_path;
@@ -16,6 +15,7 @@ use slog::Logger;
 use std::path::PathBuf;
 use std::time::Instant;
 use test::{self, webdriver};
+use wasm_pack_binary_install::Cache;
 use PBAR;
 
 #[derive(Debug, Default, StructOpt)]
diff --git a/src/lib.rs b/src/lib.rs
index e336d0f..901e1a3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,16 +4,12 @@
 
 extern crate cargo_metadata;
 extern crate console;
-extern crate curl;
-extern crate dialoguer;
-extern crate dirs;
 extern crate strsim;
 #[macro_use]
 extern crate failure;
-extern crate flate2;
 extern crate glob;
-extern crate hex;
 extern crate indicatif;
+extern crate which;
 #[macro_use]
 extern crate lazy_static;
 extern crate parking_lot;
@@ -22,20 +18,17 @@ extern crate serde;
 extern crate serde_derive;
 extern crate serde_ignored;
 extern crate serde_json;
-extern crate siphasher;
 #[macro_use]
 extern crate structopt;
 #[macro_use]
 extern crate slog;
+extern crate dialoguer;
 extern crate slog_async;
 extern crate slog_term;
-extern crate tar;
 extern crate toml;
 extern crate walkdir;
-extern crate which;
-extern crate zip;
+extern crate wasm_pack_binary_install;
 
-pub mod binaries;
 pub mod bindgen;
 pub mod build;
 pub mod child;
diff --git a/src/test/webdriver.rs b/src/test/webdriver.rs
index 4b06314..9709c40 100644
--- a/src/test/webdriver.rs
+++ b/src/test/webdriver.rs
@@ -1,10 +1,10 @@
 //! Getting WebDriver client binaries.
 
-use binaries::Cache;
 use command::build::BuildMode;
 use failure;
 use std::path::PathBuf;
 use target;
+use wasm_pack_binary_install::Cache;
 
 /// Get the path to an existing `chromedriver`, or install it if no existing
 /// binary is found.
diff --git a/tests/all/bindgen.rs b/tests/all/bindgen.rs
index 985a4d0..e1077c5 100644
--- a/tests/all/bindgen.rs
+++ b/tests/all/bindgen.rs
@@ -1,6 +1,6 @@
 use tempfile;
-use wasm_pack::binaries::Cache;
 use wasm_pack::bindgen;
+use wasm_pack_binary_install::Cache;
 
 #[test]
 #[cfg(any(
diff --git a/tests/all/main.rs b/tests/all/main.rs
index 563424d..572d655 100644
--- a/tests/all/main.rs
+++ b/tests/all/main.rs
@@ -9,6 +9,7 @@ extern crate slog;
 extern crate structopt;
 extern crate tempfile;
 extern crate wasm_pack;
+extern crate wasm_pack_binary_install;
 
 mod bindgen;
 mod build;
diff --git a/tests/all/utils/fixture.rs b/tests/all/utils/fixture.rs
index 51331b6..0596873 100644
--- a/tests/all/utils/fixture.rs
+++ b/tests/all/utils/fixture.rs
@@ -8,7 +8,7 @@ use std::sync::{MutexGuard, Once, ONCE_INIT};
 use std::thread;
 use tempfile::TempDir;
 use wasm_pack;
-use wasm_pack::binaries::Cache;
+use wasm_pack_binary_install::Cache;
 
 /// A test fixture in a temporary directory.
 pub struct Fixture {
diff --git a/tests/all/webdriver.rs b/tests/all/webdriver.rs
index f57c275..c0bbaa5 100644
--- a/tests/all/webdriver.rs
+++ b/tests/all/webdriver.rs
@@ -1,6 +1,6 @@
 use utils::fixture;
-use wasm_pack::binaries::Cache;
 use wasm_pack::test::webdriver;
+use wasm_pack_binary_install::Cache;
 
 #[test]
 #[cfg(any(