diff --git a/crates/puffin-cli/src/commands/reporters.rs b/crates/puffin-cli/src/commands/reporters.rs
index 8540e57cd..2992648f3 100644
--- a/crates/puffin-cli/src/commands/reporters.rs
+++ b/crates/puffin-cli/src/commands/reporters.rs
@@ -47,6 +47,41 @@ impl puffin_resolver::Reporter for ResolverReporter {
     }
 }
 
+#[derive(Debug)]
+pub(crate) struct UnzipReporter {
+    progress: ProgressBar,
+}
+
+impl From<Printer> for UnzipReporter {
+    fn from(printer: Printer) -> Self {
+        let progress = ProgressBar::with_draw_target(None, printer.target());
+        progress.set_message("Unzipping wheels...");
+        progress.set_style(
+            ProgressStyle::with_template("{bar:20} [{pos}/{len}] {wide_msg:.dim}").unwrap(),
+        );
+        Self { progress }
+    }
+}
+
+impl UnzipReporter {
+    #[must_use]
+    pub(crate) fn with_length(self, length: u64) -> Self {
+        self.progress.set_length(length);
+        self
+    }
+}
+
+impl puffin_installer::UnzipReporter for UnzipReporter {
+    fn on_unzip_progress(&self, name: &PackageName, version: &Version) {
+        self.progress.set_message(format!("{name}=={version}"));
+        self.progress.inc(1);
+    }
+
+    fn on_unzip_complete(&self) {
+        self.progress.finish_and_clear();
+    }
+}
+
 #[derive(Debug)]
 pub(crate) struct DownloadReporter {
     progress: ProgressBar,
diff --git a/crates/puffin-cli/src/commands/sync.rs b/crates/puffin-cli/src/commands/sync.rs
index 0658214a5..8796e8b53 100644
--- a/crates/puffin-cli/src/commands/sync.rs
+++ b/crates/puffin-cli/src/commands/sync.rs
@@ -16,7 +16,9 @@ use puffin_interpreter::{PythonExecutable, SitePackages};
 use puffin_package::package_name::PackageName;
 use puffin_package::requirements::Requirements;
 
-use crate::commands::reporters::{DownloadReporter, InstallReporter, ResolverReporter};
+use crate::commands::reporters::{
+    DownloadReporter, InstallReporter, ResolverReporter, UnzipReporter,
+};
 use crate::commands::{elapsed, ExitStatus};
 use crate::printer::Printer;
 
@@ -161,6 +163,8 @@ pub(crate) async fn sync(
         resolution
     };
 
+    let start = std::time::Instant::now();
+
     let uncached = resolution
         .into_files()
         .map(RemoteDistribution::from_file)
@@ -168,8 +172,8 @@ pub(crate) async fn sync(
     let staging = tempfile::tempdir()?;
 
     // Download any missing distributions.
-    let wheels = if uncached.is_empty() {
-        cached
+    let downloads = if uncached.is_empty() {
+        vec![]
     } else {
         let downloader = puffin_installer::Downloader::new(&client, cache)
             .with_reporter(DownloadReporter::from(printer).with_length(uncached.len() as u64));
@@ -190,10 +194,41 @@ pub(crate) async fn sync(
             .dimmed()
         )?;
 
-        downloads.into_iter().chain(cached).collect::<Vec<_>>()
+        downloads
     };
 
+    let start = std::time::Instant::now();
+
+    // Unzip any downloaded distributions.
+    let unzips = if downloads.is_empty() {
+        vec![]
+    } else {
+        let unzipper = puffin_installer::Unzipper::default()
+            .with_reporter(UnzipReporter::from(printer).with_length(downloads.len() as u64));
+
+        let unzips = unzipper
+            .download(downloads, cache.unwrap_or(staging.path()))
+            .await?;
+
+        let s = if unzips.len() == 1 { "" } else { "s" };
+        writeln!(
+            printer,
+            "{}",
+            format!(
+                "Unzipped {} in {}",
+                format!("{} package{}", unzips.len(), s).bold(),
+                elapsed(start.elapsed())
+            )
+            .dimmed()
+        )?;
+
+        unzips
+    };
+
+    let start = std::time::Instant::now();
+
     // Install the resolved distributions.
+    let wheels = unzips.into_iter().chain(cached).collect::<Vec<_>>();
     puffin_installer::Installer::new(&python)
         .with_reporter(InstallReporter::from(printer).with_length(wheels.len() as u64))
         .install(&wheels)?;
diff --git a/crates/puffin-installer/src/downloader.rs b/crates/puffin-installer/src/downloader.rs
index 230770814..278e6f6c6 100644
--- a/crates/puffin-installer/src/downloader.rs
+++ b/crates/puffin-installer/src/downloader.rs
@@ -2,13 +2,10 @@ use std::path::Path;
 
 use anyhow::Result;
 use cacache::{Algorithm, Integrity};
-use rayon::iter::ParallelBridge;
-use rayon::iter::ParallelIterator;
 use tokio::task::JoinSet;
 use tokio_util::compat::FuturesAsyncReadCompatExt;
 use tracing::debug;
 use url::Url;
-use zip::ZipArchive;
 
 use pep440_rs::Version;
 use puffin_client::PypiClient;
@@ -16,8 +13,6 @@ use puffin_package::package_name::PackageName;
 
 use crate::cache::WheelCache;
 use crate::distribution::RemoteDistribution;
-use crate::vendor::CloneableSeekableReader;
-use crate::LocalDistribution;
 
 pub struct Downloader<'a> {
     client: &'a PypiClient,
@@ -49,7 +44,7 @@ impl<'a> Downloader<'a> {
         &'a self,
         wheels: &'a [RemoteDistribution],
         target: &'a Path,
-    ) -> Result<Vec<LocalDistribution>> {
+    ) -> Result<Vec<InMemoryDistribution>> {
         // Create the wheel cache subdirectory, if necessary.
         let wheel_cache = WheelCache::new(target);
         wheel_cache.init().await?;
@@ -68,57 +63,29 @@ impl<'a> Downloader<'a> {
         }
 
         while let Some(result) = fetches.join_next().await.transpose()? {
-            downloads.push(result?);
-        }
-
-        let mut wheels = Vec::with_capacity(downloads.len());
-
-        // Phase 2: Unpack the wheels into the cache.
-        let staging = tempfile::tempdir()?;
-        for download in downloads {
-            let remote = download.remote.clone();
-
-            debug!("Unpacking wheel: {}", remote.file().filename);
-
-            // Unzip the wheel.
-            tokio::task::spawn_blocking({
-                let target = staging.path().join(remote.id());
-                move || unzip_wheel(download, &target)
-            })
-            .await??;
-
-            // Write the unzipped wheel to the target directory.
-            tokio::fs::rename(
-                staging.path().join(remote.id()),
-                wheel_cache.entry(&remote.id()),
-            )
-            .await?;
-
-            wheels.push(LocalDistribution::new(
-                remote.name().clone(),
-                remote.version().clone(),
-                wheel_cache.entry(&remote.id()),
-            ));
+            let result = result?;
 
             if let Some(reporter) = self.reporter.as_ref() {
-                reporter.on_download_progress(remote.name(), remote.version());
+                reporter.on_download_progress(result.remote.name(), result.remote.version());
             }
+
+            downloads.push(result);
         }
 
         if let Some(reporter) = self.reporter.as_ref() {
             reporter.on_download_complete();
         }
 
-        Ok(wheels)
+        Ok(downloads)
     }
 }
 
 #[derive(Debug, Clone)]
-struct InMemoryDistribution {
+pub struct InMemoryDistribution {
     /// The remote file from which this wheel was downloaded.
-    remote: RemoteDistribution,
+    pub(crate) remote: RemoteDistribution,
     /// The contents of the wheel.
-    buffer: Vec<u8>,
+    pub(crate) buffer: Vec<u8>,
 }
 
 /// Download a wheel to a given path.
@@ -154,55 +121,10 @@ async fn fetch_wheel(
     Ok(InMemoryDistribution { remote, buffer })
 }
 
-/// Write a wheel into the target directory.
-fn unzip_wheel(wheel: InMemoryDistribution, target: &Path) -> Result<()> {
-    // Read the wheel into a buffer.
-    let reader = std::io::Cursor::new(wheel.buffer);
-    let archive = ZipArchive::new(CloneableSeekableReader::new(reader))?;
-
-    // Unzip in parallel.
-    (0..archive.len())
-        .par_bridge()
-        .map(|file_number| {
-            let mut archive = archive.clone();
-            let mut file = archive.by_index(file_number)?;
-
-            // Determine the path of the file within the wheel.
-            let file_path = match file.enclosed_name() {
-                Some(path) => path.to_owned(),
-                None => return Ok(()),
-            };
-
-            // Create necessary parent directories.
-            let path = target.join(file_path);
-            if let Some(parent) = path.parent() {
-                std::fs::create_dir_all(parent)?;
-            }
-
-            // Write the file.
-            let mut outfile = std::fs::File::create(&path)?;
-            std::io::copy(&mut file, &mut outfile)?;
-
-            // Set permissions.
-            #[cfg(unix)]
-            {
-                use std::fs::Permissions;
-                use std::os::unix::fs::PermissionsExt;
-
-                if let Some(mode) = file.unix_mode() {
-                    std::fs::set_permissions(&path, Permissions::from_mode(mode))?;
-                }
-            }
-
-            Ok(())
-        })
-        .collect::<Result<_>>()
-}
-
 pub trait Reporter: Send + Sync {
     /// Callback to invoke when a wheel is downloaded.
     fn on_download_progress(&self, name: &PackageName, version: &Version);
 
-    /// Callback to invoke when the download is complete.
+    /// Callback to invoke when the operation is complete.
     fn on_download_complete(&self);
 }
diff --git a/crates/puffin-installer/src/lib.rs b/crates/puffin-installer/src/lib.rs
index f2a252053..380b242cf 100644
--- a/crates/puffin-installer/src/lib.rs
+++ b/crates/puffin-installer/src/lib.rs
@@ -3,6 +3,7 @@ pub use downloader::{Downloader, Reporter as DownloadReporter};
 pub use index::LocalIndex;
 pub use installer::{Installer, Reporter as InstallReporter};
 pub use uninstall::uninstall;
+pub use unzipper::{Reporter as UnzipReporter, Unzipper};
 
 mod cache;
 mod distribution;
@@ -10,4 +11,5 @@ mod downloader;
 mod index;
 mod installer;
 mod uninstall;
+mod unzipper;
 mod vendor;
diff --git a/crates/puffin-installer/src/unzipper.rs b/crates/puffin-installer/src/unzipper.rs
new file mode 100644
index 000000000..810d38f40
--- /dev/null
+++ b/crates/puffin-installer/src/unzipper.rs
@@ -0,0 +1,134 @@
+use std::path::Path;
+
+use anyhow::Result;
+use rayon::iter::ParallelBridge;
+use rayon::iter::ParallelIterator;
+use tracing::debug;
+use zip::ZipArchive;
+
+use pep440_rs::Version;
+use puffin_package::package_name::PackageName;
+
+use crate::cache::WheelCache;
+use crate::downloader::InMemoryDistribution;
+use crate::vendor::CloneableSeekableReader;
+use crate::LocalDistribution;
+
+#[derive(Default)]
+pub struct Unzipper {
+    reporter: Option<Box<dyn Reporter>>,
+}
+
+impl Unzipper {
+    /// Set the [`Reporter`] to use for this unzipper.
+    #[must_use]
+    pub fn with_reporter(self, reporter: impl Reporter + 'static) -> Self {
+        Self {
+            reporter: Some(Box::new(reporter)),
+        }
+    }
+
+    /// Install a set of wheels into a Python virtual environment.
+    pub async fn download(
+        &self,
+        downloads: Vec<InMemoryDistribution>,
+        target: &Path,
+    ) -> Result<Vec<LocalDistribution>> {
+        // Create the wheel cache subdirectory, if necessary.
+        let wheel_cache = WheelCache::new(target);
+        wheel_cache.init().await?;
+
+        let staging = tempfile::tempdir()?;
+
+        // Unpack the wheels into the cache.
+        let mut wheels = Vec::with_capacity(downloads.len());
+        for download in downloads {
+            let remote = download.remote.clone();
+
+            debug!("Unpacking wheel: {}", remote.file().filename);
+
+            // Unzip the wheel.
+            tokio::task::spawn_blocking({
+                let target = staging.path().join(remote.id());
+                move || unzip_wheel(download, &target)
+            })
+            .await??;
+
+            // Write the unzipped wheel to the target directory.
+            tokio::fs::rename(
+                staging.path().join(remote.id()),
+                wheel_cache.entry(&remote.id()),
+            )
+            .await?;
+
+            wheels.push(LocalDistribution::new(
+                remote.name().clone(),
+                remote.version().clone(),
+                wheel_cache.entry(&remote.id()),
+            ));
+
+            if let Some(reporter) = self.reporter.as_ref() {
+                reporter.on_unzip_progress(remote.name(), remote.version());
+            }
+        }
+
+        if let Some(reporter) = self.reporter.as_ref() {
+            reporter.on_unzip_complete();
+        }
+
+        Ok(wheels)
+    }
+}
+
+/// Write a wheel into the target directory.
+fn unzip_wheel(wheel: InMemoryDistribution, target: &Path) -> Result<()> {
+    // Read the wheel into a buffer.
+    let reader = std::io::Cursor::new(wheel.buffer);
+    let archive = ZipArchive::new(CloneableSeekableReader::new(reader))?;
+
+    // Unzip in parallel.
+    (0..archive.len())
+        .par_bridge()
+        .map(|file_number| {
+            let mut archive = archive.clone();
+            let mut file = archive.by_index(file_number)?;
+
+            // Determine the path of the file within the wheel.
+            let file_path = match file.enclosed_name() {
+                Some(path) => path.to_owned(),
+                None => return Ok(()),
+            };
+
+            // Create necessary parent directories.
+            let path = target.join(file_path);
+            if let Some(parent) = path.parent() {
+                std::fs::create_dir_all(parent)?;
+            }
+
+            // Write the file.
+            let mut outfile = std::fs::File::create(&path)?;
+            std::io::copy(&mut file, &mut outfile)?;
+
+            // Set permissions.
+            #[cfg(unix)]
+            {
+                use std::fs::Permissions;
+                use std::os::unix::fs::PermissionsExt;
+
+                if let Some(mode) = file.unix_mode() {
+                    std::fs::set_permissions(&path, Permissions::from_mode(mode))?;
+                }
+            }
+
+            Ok(())
+        })
+        .collect::<Result<_>>()
+}
+
+pub trait Reporter: Send + Sync {
+    /// Callback to invoke when a wheel is unzipped.
+    fn on_unzip_progress(&self, name: &PackageName, version: &Version);
+
+    /// Callback to invoke when the operation is complete.
+    fn on_unzip_complete(&self);
+}
diff --git a/crates/puffin-resolver/requirements.txt b/crates/puffin-resolver/requirements.txt
deleted file mode 100644
index 7482041ee..000000000
--- a/crates/puffin-resolver/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-mypy
\ No newline at end of file
diff --git a/crates/puffin-resolver/src/resolution.rs b/crates/puffin-resolver/src/resolution.rs
index 7bc57a298..1c5bafad1 100644
--- a/crates/puffin-resolver/src/resolution.rs
+++ b/crates/puffin-resolver/src/resolution.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 
 use pep440_rs::Version;
 use puffin_client::File;
@@ -6,11 +6,11 @@ use puffin_package::metadata::Metadata21;
 use puffin_package::package_name::PackageName;
 
 #[derive(Debug, Default)]
-pub struct Resolution(HashMap<PackageName, PinnedPackage>);
+pub struct Resolution(BTreeMap<PackageName, PinnedPackage>);
 
 impl Resolution {
     /// Create a new resolution from the given pinned packages.
-    pub(crate) fn new(packages: HashMap<PackageName, PinnedPackage>) -> Self {
+    pub(crate) fn new(packages: BTreeMap<PackageName, PinnedPackage>) -> Self {
         Self(packages)
     }
 
diff --git a/crates/puffin-resolver/src/resolver.rs b/crates/puffin-resolver/src/resolver.rs
index df5dfb219..49b0b5505 100644
--- a/crates/puffin-resolver/src/resolver.rs
+++ b/crates/puffin-resolver/src/resolver.rs
@@ -1,4 +1,4 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::{BTreeMap, HashSet};
 use std::str::FromStr;
 
 use anyhow::Result;
@@ -87,8 +87,7 @@ impl<'a> Resolver<'a> {
         }
 
         // Resolve the requirements.
-        let mut resolution: HashMap<PackageName, PinnedPackage> =
-            HashMap::with_capacity(in_flight.len());
+        let mut resolution: BTreeMap<PackageName, PinnedPackage> = BTreeMap::new();
 
         while let Some(chunk) = package_stream.next().await {
             for result in chunk {
diff --git a/crates/puffin-resolver/tests/resolver.rs b/crates/puffin-resolver/tests/resolver.rs
index 982fb1d85..76d48eb41 100644
--- a/crates/puffin-resolver/tests/resolver.rs
+++ b/crates/puffin-resolver/tests/resolver.rs
@@ -99,7 +99,7 @@ async fn scipy() -> Result<()> {
         )
         .await?;
 
-    assert_eq!(format!("{resolution}"), "scipy==1.11.2\nnumpy==1.25.2");
+    assert_eq!(format!("{resolution}"), "numpy==1.25.2\nscipy==1.11.2");
 
     Ok(())
 }