diff --git a/src/commands/build.rs b/src/commands/build.rs
index 46bca724..41cc135f 100644
--- a/src/commands/build.rs
+++ b/src/commands/build.rs
@@ -157,7 +157,7 @@ pub async fn build(
         ));
     }
     let package = *packages
-        .get(0)
+        .first()
         .ok_or_else(|| anyhow!("Found no package."))?;
 
     let release_stores = config
diff --git a/src/commands/endpoint_container.rs b/src/commands/endpoint_container.rs
index b7c6882e..0e102a45 100644
--- a/src/commands/endpoint_container.rs
+++ b/src/commands/endpoint_container.rs
@@ -52,7 +52,7 @@ pub async fn container(
     }
 
     let relevant_endpoint = relevant_endpoints
-        .get(0)
+        .first()
         .ok_or_else(|| anyhow!("Found no container for id {}", container_id))?;
 
     let container = relevant_endpoint
diff --git a/src/package/dependency/build.rs b/src/package/dependency/build.rs
index 678c5646..ad2440eb 100644
--- a/src/package/dependency/build.rs
+++ b/src/package/dependency/build.rs
@@ -128,7 +128,7 @@ mod tests {
         let s: TestSettings =
             toml::from_str(r#"settings = [{ name = "foo", condition = { in_image = "bar"} }]"#)
                 .expect("Parsing TestSetting failed");
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             BuildDependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
@@ -152,7 +152,7 @@ mod tests {
 
         let s: TestSettings = toml::from_str(pretty).expect("Parsing TestSetting failed");
 
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             BuildDependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
@@ -176,7 +176,7 @@ mod tests {
 
         let s: TestSettings = toml::from_str(pretty).expect("Parsing TestSetting failed");
 
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             BuildDependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
diff --git a/src/package/dependency/runtime.rs b/src/package/dependency/runtime.rs
index f077e57f..75708acb 100644
--- a/src/package/dependency/runtime.rs
+++ b/src/package/dependency/runtime.rs
@@ -142,7 +142,7 @@ mod tests {
         let s: TestSettings =
             toml::from_str(r#"settings = [{ name = "foo", condition = { in_image = "bar"} }]"#)
                 .expect("Parsing TestSetting failed");
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             Dependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
@@ -166,7 +166,7 @@ mod tests {
 
         let s: TestSettings = toml::from_str(pretty).expect("Parsing TestSetting failed");
 
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             Dependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
@@ -190,7 +190,7 @@ mod tests {
 
         let s: TestSettings = toml::from_str(pretty).expect("Parsing TestSetting failed");
 
-        match s.settings.get(0).expect("Has not one dependency") {
+        match s.settings.first().expect("Has not one dependency") {
             Dependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
@@ -218,7 +218,7 @@ mod tests {
 
         let s: TestSettings = toml::from_str(pretty).expect("Parsing TestSetting failed");
 
-        match s.settings.get(0).expect("Has not one dependencies") {
+        match s.settings.first().expect("Has not one dependencies") {
             Dependency::Conditional { name, condition } => {
                 assert_eq!(name, "foo", "Expected 'foo', got {name}");
                 assert_eq!(*condition.has_env(), None);
diff --git a/src/repository/repository.rs b/src/repository/repository.rs
index 87294ade..208ba262 100644
--- a/src/repository/repository.rs
+++ b/src/repository/repository.rs
@@ -205,7 +205,7 @@ pub mod tests {
         let ps = repo.find_by_name(&pname("a"));
         assert_eq!(ps.len(), 1);
 
-        let p = ps.get(0).unwrap();
+        let p = ps.first().unwrap();
         assert_eq!(*p.name(), pname("a"));
         assert_eq!(*p.version(), pversion("1"));
         assert!(!p.version_is_semver());
@@ -233,7 +233,7 @@ pub mod tests {
         let ps = repo.find(&pname("a"), &pversion("2"));
         assert_eq!(ps.len(), 1);
 
-        let p = ps.get(0).unwrap();
+        let p = ps.first().unwrap();
         assert_eq!(*p.name(), pname("a"));
         assert_eq!(*p.version(), pversion("2"));
         assert!(!p.version_is_semver());
@@ -269,7 +269,7 @@ pub mod tests {
         let ps = repo.find_with_version(&pname("a"), &constraint);
         assert_eq!(ps.len(), 1);
 
-        let p = ps.get(0).unwrap();
+        let p = ps.first().unwrap();
         assert_eq!(*p.name(), pname("a"));
         assert_eq!(*p.version(), pversion("2"));
         assert!(!p.version_is_semver());
diff --git a/src/util/filters.rs b/src/util/filters.rs
index 7002b896..dca693ee 100644
--- a/src/util/filters.rs
+++ b/src/util/filters.rs
@@ -191,7 +191,7 @@ mod tests {
             .unwrap();
 
         assert_eq!(found.len(), 1);
-        let p = found.get(0).unwrap();
+        let p = found.first().unwrap();
         assert_eq!(*p.name(), pname("a"));
         assert_eq!(
             *p.dependencies().runtime(),
@@ -289,7 +289,7 @@ mod tests {
             .unwrap();
 
         assert_eq!(found.len(), 1);
-        let p = found.get(0).unwrap();
+        let p = found.first().unwrap();
         assert_eq!(*p.name(), pname("a"));
         assert_eq!(
             *p.dependencies().runtime(),
@@ -346,7 +346,7 @@ mod tests {
         assert_eq!(found.len(), 2);
 
         {
-            let p = found.get(0).unwrap();
+            let p = found.first().unwrap();
             assert_eq!(*p.name(), pname("a"));
             assert_eq!(
                 *p.dependencies().runtime(),