diff --git a/crates/puffin-build/src/lib.rs b/crates/puffin-build/src/lib.rs
index fb50318a6..c7ed1aa57 100644
--- a/crates/puffin-build/src/lib.rs
+++ b/crates/puffin-build/src/lib.rs
@@ -436,7 +436,7 @@ async fn resolve_and_install(
     debug!("Installing {} build requirements", requirements.len());
 
     let local_index = if let Some(cache) = cache {
-        LocalIndex::from_directory(cache).await?
+        LocalIndex::try_from_directory(cache)?
     } else {
         LocalIndex::default()
     };
diff --git a/crates/puffin-cli/src/commands/freeze.rs b/crates/puffin-cli/src/commands/freeze.rs
index 011915af1..4e92148c0 100644
--- a/crates/puffin-cli/src/commands/freeze.rs
+++ b/crates/puffin-cli/src/commands/freeze.rs
@@ -11,7 +11,7 @@ use crate::commands::ExitStatus;
 use crate::printer::Printer;
 
 /// Enumerate the installed packages in the current environment.
-pub(crate) async fn freeze(cache: Option<&Path>, _printer: Printer) -> Result<ExitStatus> {
+pub(crate) fn freeze(cache: Option<&Path>, _printer: Printer) -> Result<ExitStatus> {
     // Detect the current Python interpreter.
     let platform = Platform::current()?;
     let python = PythonExecutable::from_env(platform, cache)?;
@@ -21,7 +21,7 @@ pub(crate) async fn freeze(cache: Option<&Path>, _printer: Printer) -> Result<Ex
     );
 
     // Build the installed index.
-    let site_packages = SitePackages::from_executable(&python).await?;
+    let site_packages = SitePackages::try_from_executable(&python)?;
     for (name, dist_info) in site_packages.iter() {
         #[allow(clippy::print_stdout)]
         {
diff --git a/crates/puffin-cli/src/commands/pip_sync.rs b/crates/puffin-cli/src/commands/pip_sync.rs
index 691ec2b32..e9926aca9 100644
--- a/crates/puffin-cli/src/commands/pip_sync.rs
+++ b/crates/puffin-cli/src/commands/pip_sync.rs
@@ -69,7 +69,7 @@ pub(crate) async fn sync_requirements(
         local,
         remote,
         extraneous,
-    } = PartitionedRequirements::try_from_requirements(requirements, cache, &python).await?;
+    } = PartitionedRequirements::try_from_requirements(requirements, cache, &python)?;
 
     // Nothing to do.
     if remote.is_empty() && local.is_empty() && extraneous.is_empty() {
@@ -284,17 +284,17 @@ struct PartitionedRequirements {
 impl PartitionedRequirements {
     /// Partition a set of requirements into those that should be linked from the cache, those that
     /// need to be downloaded, and those that should be removed.
-    pub(crate) async fn try_from_requirements(
+    pub(crate) fn try_from_requirements(
         requirements: &[Requirement],
         cache: Option<&Path>,
         python: &PythonExecutable,
     ) -> Result<Self> {
         // Index all the already-installed packages in site-packages.
-        let mut site_packages = SitePackages::from_executable(python).await?;
+        let mut site_packages = SitePackages::try_from_executable(python)?;
 
         // Index all the already-downloaded wheels in the cache.
         let local_index = if let Some(cache) = cache {
-            LocalIndex::from_directory(cache).await?
+            LocalIndex::try_from_directory(cache)?
         } else {
             LocalIndex::default()
         };
diff --git a/crates/puffin-cli/src/commands/pip_uninstall.rs b/crates/puffin-cli/src/commands/pip_uninstall.rs
index b4c0f458a..9c3f4dccb 100644
--- a/crates/puffin-cli/src/commands/pip_uninstall.rs
+++ b/crates/puffin-cli/src/commands/pip_uninstall.rs
@@ -39,7 +39,7 @@ pub(crate) async fn pip_uninstall(
     );
 
     // Index the current `site-packages` directory.
-    let site_packages = puffin_installer::SitePackages::from_executable(&python).await?;
+    let site_packages = puffin_installer::SitePackages::try_from_executable(&python)?;
 
     // Sort and deduplicate the requirements.
     let packages = {
diff --git a/crates/puffin-cli/src/main.rs b/crates/puffin-cli/src/main.rs
index a5d6faf26..0bbced5c7 100644
--- a/crates/puffin-cli/src/main.rs
+++ b/crates/puffin-cli/src/main.rs
@@ -198,7 +198,6 @@ async fn main() -> ExitCode {
                     .filter(|_| !cli.no_cache),
                 printer,
             )
-            .await
         }
         Commands::Venv(args) => commands::venv(&args.name, args.python.as_deref(), printer).await,
         Commands::Add(args) => commands::add(&args.name, printer),
diff --git a/crates/puffin-installer/Cargo.toml b/crates/puffin-installer/Cargo.toml
index d8136b7fc..bdfba2576 100644
--- a/crates/puffin-installer/Cargo.toml
+++ b/crates/puffin-installer/Cargo.toml
@@ -26,4 +26,4 @@ tokio = { workspace = true }
 tokio-util = { workspace = true }
 tracing = { workspace = true }
 url = { workspace = true }
-zip = { workspace = true }
\ No newline at end of file
+zip = { workspace = true }
diff --git a/crates/puffin-installer/src/cache.rs b/crates/puffin-installer/src/cache.rs
index 788d6a46a..775be4040 100644
--- a/crates/puffin-installer/src/cache.rs
+++ b/crates/puffin-installer/src/cache.rs
@@ -1,6 +1,6 @@
 use std::path::{Path, PathBuf};
 
-use fs_err::tokio as fs;
+use fs_err as fs;
 
 static WHEEL_CACHE: &str = "wheels-v0";
 
@@ -23,13 +23,13 @@ impl WheelCache {
     }
 
     /// Initialize the wheel cache.
-    pub(crate) async fn init(&self) -> std::io::Result<()> {
-        fs::create_dir_all(&self.root).await
+    pub(crate) fn init(&self) -> std::io::Result<()> {
+        fs::create_dir_all(&self.root)
     }
 
     /// Returns a handle to the wheel cache directory.
-    pub(crate) async fn read_dir(&self) -> std::io::Result<fs::ReadDir> {
-        fs::read_dir(&self.root).await
+    pub(crate) fn read_dir(&self) -> std::io::Result<fs::ReadDir> {
+        fs::read_dir(&self.root)
     }
 
     /// Returns the cache root.
diff --git a/crates/puffin-installer/src/downloader.rs b/crates/puffin-installer/src/downloader.rs
index cdd1ac789..ef11e6e6b 100644
--- a/crates/puffin-installer/src/downloader.rs
+++ b/crates/puffin-installer/src/downloader.rs
@@ -47,7 +47,7 @@ impl<'a> Downloader<'a> {
     ) -> Result<Vec<InMemoryDistribution>> {
         // Create the wheel cache subdirectory, if necessary.
         let wheel_cache = WheelCache::new(target);
-        wheel_cache.init().await?;
+        wheel_cache.init()?;
 
         // Phase 1: Fetch the wheels in parallel.
         let mut fetches = JoinSet::new();
diff --git a/crates/puffin-installer/src/lib.rs b/crates/puffin-installer/src/lib.rs
index 4c17af430..65396a2b3 100644
--- a/crates/puffin-installer/src/lib.rs
+++ b/crates/puffin-installer/src/lib.rs
@@ -2,8 +2,8 @@ pub use distribution::{
     CachedDistribution, Distribution, InstalledDistribution, RemoteDistribution,
 };
 pub use downloader::{Downloader, Reporter as DownloadReporter};
-pub use index::LocalIndex;
 pub use installer::{Installer, Reporter as InstallReporter};
+pub use local_index::LocalIndex;
 pub use site_packages::SitePackages;
 pub use uninstall::uninstall;
 pub use unzipper::{Reporter as UnzipReporter, Unzipper};
@@ -11,8 +11,8 @@ pub use unzipper::{Reporter as UnzipReporter, Unzipper};
 mod cache;
 mod distribution;
 mod downloader;
-mod index;
 mod installer;
+mod local_index;
 mod site_packages;
 mod uninstall;
 mod unzipper;
diff --git a/crates/puffin-installer/src/index.rs b/crates/puffin-installer/src/local_index.rs
similarity index 80%
rename from crates/puffin-installer/src/index.rs
rename to crates/puffin-installer/src/local_index.rs
index 8e8089c9e..73fc514c3 100644
--- a/crates/puffin-installer/src/index.rs
+++ b/crates/puffin-installer/src/local_index.rs
@@ -14,16 +14,17 @@ pub struct LocalIndex(HashMap<PackageName, CachedDistribution>);
 
 impl LocalIndex {
     /// Build an index of cached distributions from a directory.
-    pub async fn from_directory(path: &Path) -> Result<Self> {
+    pub fn try_from_directory(path: &Path) -> Result<Self> {
         let mut index = HashMap::new();
 
         let cache = WheelCache::new(path);
-        let Ok(mut dir) = cache.read_dir().await else {
+        let Ok(dir) = cache.read_dir() else {
             return Ok(Self(index));
         };
 
-        while let Some(entry) = dir.next_entry().await? {
-            if entry.file_type().await?.is_dir() {
+        for entry in dir {
+            let entry = entry?;
+            if entry.file_type()?.is_dir() {
                 if let Some(dist_info) = CachedDistribution::try_from_path(&entry.path())? {
                     index.insert(dist_info.name().clone(), dist_info);
                 }
diff --git a/crates/puffin-installer/src/site_packages.rs b/crates/puffin-installer/src/site_packages.rs
index 75b1d3347..50bda7e0f 100644
--- a/crates/puffin-installer/src/site_packages.rs
+++ b/crates/puffin-installer/src/site_packages.rs
@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 
 use anyhow::Result;
-use fs_err::tokio as fs;
+use fs_err as fs;
 
 use puffin_interpreter::PythonExecutable;
 use puffin_package::package_name::PackageName;
@@ -13,12 +13,12 @@ pub struct SitePackages(BTreeMap<PackageName, InstalledDistribution>);
 
 impl SitePackages {
     /// Build an index of installed packages from the given Python executable.
-    pub async fn from_executable(python: &PythonExecutable) -> Result<Self> {
+    pub fn try_from_executable(python: &PythonExecutable) -> Result<Self> {
         let mut index = BTreeMap::new();
 
-        let mut dir = fs::read_dir(python.site_packages()).await?;
-        while let Some(entry) = dir.next_entry().await? {
-            if entry.file_type().await?.is_dir() {
+        for entry in fs::read_dir(python.site_packages())? {
+            let entry = entry?;
+            if entry.file_type()?.is_dir() {
                 if let Some(dist_info) = InstalledDistribution::try_from_path(&entry.path())? {
                     index.insert(dist_info.name().clone(), dist_info);
                 }
diff --git a/crates/puffin-installer/src/unzipper.rs b/crates/puffin-installer/src/unzipper.rs
index ae2d19449..d44e12f0f 100644
--- a/crates/puffin-installer/src/unzipper.rs
+++ b/crates/puffin-installer/src/unzipper.rs
@@ -1,8 +1,6 @@
 use std::path::Path;
 
 use anyhow::Result;
-use fs_err::tokio as fs;
-use fs_err::File;
 use rayon::iter::ParallelBridge;
 use rayon::iter::ParallelIterator;
 use tracing::debug;
@@ -38,7 +36,7 @@ impl Unzipper {
     ) -> Result<Vec<CachedDistribution>> {
         // Create the wheel cache subdirectory, if necessary.
         let wheel_cache = WheelCache::new(target);
-        wheel_cache.init().await?;
+        wheel_cache.init()?;
 
         let staging = tempfile::tempdir_in(wheel_cache.root())?;
 
@@ -57,7 +55,7 @@ impl Unzipper {
             .await??;
 
             // Write the unzipped wheel to the target directory.
-            fs::rename(
+            fs_err::tokio::rename(
                 staging.path().join(remote.id()),
                 wheel_cache.entry(&remote.id()),
             )
@@ -104,15 +102,15 @@ fn unzip_wheel(wheel: InMemoryDistribution, target: &Path) -> Result<()> {
             // Create necessary parent directories.
             let path = target.join(file_path);
             if file.is_dir() {
-                std::fs::create_dir_all(path)?;
+                fs_err::create_dir_all(path)?;
                 return Ok(());
             }
             if let Some(parent) = path.parent() {
-                std::fs::create_dir_all(parent)?;
+                fs_err::create_dir_all(parent)?;
             }
 
             // Write the file.
-            let mut outfile = File::create(&path)?;
+            let mut outfile = fs_err::File::create(&path)?;
             std::io::copy(&mut file, &mut outfile)?;
 
             // Set permissions.