diff --git a/src/env/azure.rs b/src/env/azure.rs
index 16830a8..c2bb37a 100644
--- a/src/env/azure.rs
+++ b/src/env/azure.rs
@@ -133,7 +133,7 @@ impl AzureConfig {
         if let Some(url) = &self.azure_keyvault_url {
             Ok(url.to_string())
         } else if let Some(name) = &self.azure_keyvault_name {
-            Ok(format!("https://{}.vault.azure.net", name))
+            Ok(format!("https://{name}.vault.azure.net"))
         } else {
             Err(AzureError::ConfigurationError(anyhow::Error::msg(
                 "configuration is invalid (Clap should not validate that)",
diff --git a/src/env/convert.rs b/src/env/convert.rs
index f065164..f31765b 100644
--- a/src/env/convert.rs
+++ b/src/env/convert.rs
@@ -20,8 +20,8 @@ pub fn as_valid_env_name(name: String) -> Result<String> {
 pub fn value_as_string(name: &str, v: Value) -> Result<String> {
     match v {
         Value::String(s) => Ok(s),
-        Value::Bool(b) => Ok(format!("{}", b)),
-        Value::Number(n) => Ok(format!("{}", n)),
+        Value::Bool(b) => Ok(format!("{b}")),
+        Value::Number(n) => Ok(format!("{n}")),
         Value::Null => Ok("null".to_string()),
         _ => bail!("secret '{}' value is not convertible", name),
     }
diff --git a/src/env/google.rs b/src/env/google.rs
index 0c5c00c..c149efe 100644
--- a/src/env/google.rs
+++ b/src/env/google.rs
@@ -137,7 +137,7 @@ impl Vault for GoogleConfig {
         let project = self.google_project.as_ref().unwrap();
         let response = manager
             .projects()
-            .secrets_list(&format!("projects/{}", project))
+            .secrets_list(&format!("projects/{project}"))
             .page_size(250)
             .doit()
             .await
@@ -205,7 +205,7 @@ impl GoogleConfig {
     ) -> Result<String> {
         let data = manager
             .projects()
-            .secrets_versions_access(&format!("{}/versions/latest", name))
+            .secrets_versions_access(&format!("{name}/versions/latest"))
             .doit()
             .await
             .map_err(GoogleError::SecretManagerError)?
@@ -215,7 +215,7 @@ impl GoogleConfig {
             .data
             .ok_or(GoogleError::EmptySecret)?;
         let raw_bytes = base64
-            .decode(&data)
+            .decode(data)
             .map_err(|e| GoogleError::WrongEncoding(anyhow::anyhow!(e)))?;
         String::from_utf8(raw_bytes).map_err(|e| GoogleError::WrongEncoding(anyhow::anyhow!(e)))
     }
diff --git a/src/env/process_env.rs b/src/env/process_env.rs
index a8a76fc..3eb5f7a 100644
--- a/src/env/process_env.rs
+++ b/src/env/process_env.rs
@@ -79,6 +79,8 @@ impl ProcessEnv {
 
 #[cfg(test)]
 mod tests {
+    use std::fmt::Display;
+
     use super::*;
 
     impl ProcessEnv {
@@ -97,9 +99,11 @@ mod tests {
         pub fn from_str(s: &str) -> Self {
             serde_json::from_str(s).unwrap()
         }
+    }
 
-        pub fn to_string(&self) -> String {
-            serde_json::to_string(self).unwrap()
+    impl Display for ProcessEnv {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            write!(f, "{}", serde_json::to_string(self).unwrap())
         }
     }