diff --git a/Cargo.lock b/Cargo.lock
index dd398c4..590fc85 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,2001 +1,2001 @@
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+ "bitflags 0.7.0",
+]
diff --git a/src/metadata.rs b/src/metadata.rs
index c62bb14..30cd7f2 100644
--- a/src/metadata.rs
+++ b/src/metadata.rs
@@ -33,7 +33,7 @@ macro_rules! box_result {
 /// `fetch_metadata` is the generic, top-level function that is used by the main
 /// function to fetch metadata. The configured provider is passed in and this
 /// function dispatches the call to the correct provider-specific fetch function
-pub fn fetch_metadata(provider: &str) -> errors::Result<Box<providers::MetadataProvider>> {
+pub fn fetch_metadata(provider: &str) -> errors::Result<Box<dyn providers::MetadataProvider>> {
     match provider {
         #[cfg(not(feature = "cl-legacy"))]
         "aws" => box_result!(AwsProvider::try_new()?),
diff --git a/src/providers/mod.rs b/src/providers/mod.rs
index 91d1228..35e0410 100644
--- a/src/providers/mod.rs
+++ b/src/providers/mod.rs
@@ -98,7 +98,6 @@ fn write_ssh_keys(user: User, ssh_keys: Vec<PublicKey>) -> Result<()> {
 #[cfg(not(feature = "cl-legacy"))]
 fn write_ssh_keys(user: User, ssh_keys: Vec<PublicKey>) -> Result<()> {
     use std::io::ErrorKind::NotFound;
-    use tempfile;
     use users::os::unix::UserExt;
 
     // switch users