diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ae9fcca..fecc5a3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -59,6 +59,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   - Removed `cert`, `key`, `root` fields from config file.
 - Changed `set_giganto_config` to receive toml-string with full configuration.
 - Updated `giganto_config` to respond full configuration.
+- Renamed `root` to `root_ca`.
 
 ## [0.20.0] - 2024-05-17
 
diff --git a/src/main.rs b/src/main.rs
index 19ed1db3..e8763425 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -73,8 +73,8 @@ async fn main() -> Result<()> {
     let key_pem = fs::read(&args.key)
         .with_context(|| format!("failed to read private key file: {}", args.key))?;
     let key = to_private_key(&key_pem).context("cannot read private key")?;
-    let root_pem = fs::read(&args.root)
-        .with_context(|| format!("failed to read root certificate file: {}", args.root))?;
+    let root_pem = fs::read(&args.root_ca)
+        .with_context(|| format!("failed to read root certificate file: {}", args.root_ca))?;
     let root_cert = to_root_cert(&root_pem)?;
     let certs = Arc::new(Certs {
         certs: cert.clone(),
diff --git a/src/settings.rs b/src/settings.rs
index f0085536..4f0443c3 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -34,8 +34,8 @@ pub struct Args {
     pub key: String,
 
     /// Path to the root CA file
-    #[arg(long, value_name = "ROOT_PATH")]
-    pub root: String,
+    #[arg(long, value_name = "ROOT_CA_PATH")]
+    pub root_ca: String,
 
     /// Enable the repair mode
     #[arg(long)]