diff --git a/cio/src/app_config.rs b/cio/src/app_config.rs
index 681388285..e9b07aac9 100644
--- a/cio/src/app_config.rs
+++ b/cio/src/app_config.rs
@@ -265,7 +265,7 @@ from = 'test@testemaildomain.com'
 
     #[test]
     fn test_received_letter() {
-        let config: ApplyConfig = toml::from_str(&mock_apply_toml()).unwrap();
+        let config: ApplyConfig = toml::from_str(mock_apply_toml()).unwrap();
         let applicant = mock_applicant();
 
         let letter = config.create_received_letter(&applicant);
@@ -279,7 +279,7 @@ from = 'test@testemaildomain.com'
 
     #[test]
     fn test_rejection_letter() {
-        let config: ApplyConfig = toml::from_str(&mock_apply_toml()).unwrap();
+        let config: ApplyConfig = toml::from_str(mock_apply_toml()).unwrap();
         let applicant = mock_applicant();
 
         let letter = config.create_rejection_letter("test-rejection", &applicant).unwrap();
@@ -293,7 +293,7 @@ from = 'test@testemaildomain.com'
 
     #[test]
     fn test_missing_rejection_letter() {
-        let config: ApplyConfig = toml::from_str(&mock_apply_toml()).unwrap();
+        let config: ApplyConfig = toml::from_str(mock_apply_toml()).unwrap();
         let applicant = mock_applicant();
         let letter = config.create_rejection_letter("test-missing", &applicant);
 
diff --git a/cio/src/applicants.rs b/cio/src/applicants.rs
index 1745a6db2..070b56ed6 100644
--- a/cio/src/applicants.rs
+++ b/cio/src/applicants.rs
@@ -1238,7 +1238,7 @@ pub async fn get_file_contents(drive_client: &GoogleDrive, url: &str) -> Result<
     };
 
     // Delete the temporary file, if it exists.
-    for p in vec![path, output] {
+    for p in [path, output] {
         if p.exists() && !p.is_dir() {
             fs::remove_file(p).await?;
         }
@@ -1274,7 +1274,7 @@ async fn read_pdf(name: &str, path: std::path::PathBuf) -> Result<String> {
     };
 
     // Delete the temporary file, if it exists.
-    for p in vec![path, output] {
+    for p in [path, output] {
         if p.exists() && !p.is_dir() {
             fs::remove_file(p).await?;
         }
diff --git a/cio/src/configs.rs b/cio/src/configs.rs
index 9dc1fe85b..03f9c4418 100644
--- a/cio/src/configs.rs
+++ b/cio/src/configs.rs
@@ -3002,6 +3002,6 @@ manager = 'orb'
         assert_eq!(user.first_name, "Test");
         assert_eq!(user.last_name, "User");
         assert_eq!(user.denied_services, vec![]);
-        assert_eq!(user.gusto_pull_permission, false);
+        assert!(!user.gusto_pull_permission);
     }
 }
diff --git a/cio/src/rfd/content.rs b/cio/src/rfd/content.rs
index a8d50cda0..aecfc31ff 100644
--- a/cio/src/rfd/content.rs
+++ b/cio/src/rfd/content.rs
@@ -214,7 +214,7 @@ impl<'a> RFDContent<'a> {
                 .replace("labels:", "")
                 .trim()
                 .to_string()
-                .split(";")
+                .split(';')
                 .map(|label| label.to_string())
                 .collect::<Vec<_>>(),
             None => Default::default(),
@@ -1067,7 +1067,7 @@ in velit.
             "{}/tests/ref/asciidoc_to_pdf.pdf",
             std::env::var("CARGO_MANIFEST_DIR").unwrap()
         );
-        let expected = std::fs::read(&ref_path).unwrap();
+        let expected = std::fs::read(ref_path).unwrap();
 
         assert_eq!(expected, pdf);
     }
diff --git a/cio/tests/mailerlite.rs b/cio/tests/mailerlite.rs
index 020718993..6fca08743 100644
--- a/cio/tests/mailerlite.rs
+++ b/cio/tests/mailerlite.rs
@@ -15,7 +15,7 @@ async fn test_mark_subscriber() {
     setup();
 
     let client = cio_api::mailerlite::Mailerlite::new().unwrap();
-    let res = client.mark_mailing_list_subscriber("").await.unwrap();
+    let _res = client.mark_mailing_list_subscriber("").await.unwrap();
 }
 
 #[ignore]
@@ -27,10 +27,10 @@ async fn test_mark_batch() {
     let list = client.pending_mailing_list_subscribers().await.unwrap();
 
     let batch = list.chunks(10).next().unwrap();
-    let res = client.mark_mailing_list_subscribers(batch.to_vec()).await.unwrap();
+    let _res = client.mark_mailing_list_subscribers(batch.to_vec()).await.unwrap();
 
     let batch = list.chunks(10).next().unwrap();
-    let res = client.mark_mailing_list_subscribers(batch.to_vec()).await.unwrap();
+    let _res = client.mark_mailing_list_subscribers(batch.to_vec()).await.unwrap();
 
-    let list = client.pending_mailing_list_subscribers().await.unwrap();
+    let _list = client.pending_mailing_list_subscribers().await.unwrap();
 }
diff --git a/mailchimp-minimal-api/src/lib.rs b/mailchimp-minimal-api/src/lib.rs
index 99cf75de8..9e8f68a8d 100644
--- a/mailchimp-minimal-api/src/lib.rs
+++ b/mailchimp-minimal-api/src/lib.rs
@@ -195,11 +195,11 @@ impl error::Error for MailChimpError {
 #[cfg(test)]
 mod tests {
     use super::{AuthMode, MailChimpError};
-    use base64;
+    
     use std::str::from_utf8;
 
-    static VALID_FORMAT: &'static str = "5555555555555555-us6";
-    static INVALID_FORMAT: &'static str = "5555555555555555us6";
+    static VALID_FORMAT: &str = "5555555555555555-us6";
+    static INVALID_FORMAT: &str = "5555555555555555us6";
 
     #[test]
     fn test_computes_datacenter() {
diff --git a/mailchimp-minimal-api/tests/list_subscribers.rs b/mailchimp-minimal-api/tests/list_subscribers.rs
index a875bcd70..23370f88d 100644
--- a/mailchimp-minimal-api/tests/list_subscribers.rs
+++ b/mailchimp-minimal-api/tests/list_subscribers.rs
@@ -11,5 +11,5 @@ async fn test_get_subscriber_list() {
         .await
         .unwrap();
 
-    assert!(0 < list.len());
+    assert!(!list.is_empty());
 }
diff --git a/webhooky/src/sagas.rs b/webhooky/src/sagas.rs
index ae9ca8aa2..8422debd3 100644
--- a/webhooky/src/sagas.rs
+++ b/webhooky/src/sagas.rs
@@ -245,8 +245,7 @@ mod tests {
 
         let lines = records
             .split('\n')
-            .into_iter()
-            .filter(|s| s.len() != 0)
+            .filter(|s| !s.is_empty())
             .map(|s| serde_json::from_str::<Line>(s).unwrap())
             .collect::<Vec<_>>();