diff --git a/doctreecmd/src/main.rs b/doctreecmd/src/main.rs
index 4ee07f9..27f35e3 100644
--- a/doctreecmd/src/main.rs
+++ b/doctreecmd/src/main.rs
@@ -90,7 +90,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name
@@ -116,7 +116,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name
@@ -141,7 +141,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name
@@ -159,7 +159,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name
@@ -271,7 +271,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name
@@ -287,7 +287,7 @@ fn main() -> Result<()> {
         let doctree_name = matches.value_of("doctree").unwrap_or("default");
         
         // Create a storage with the specified doctree name
-        let mut storage = RedisStorage::new("redis://localhost:6379")?;
+        let storage = RedisStorage::new("redis://localhost:6379")?;
         storage.set_doctree_name(doctree_name);
         
         // Create a DocTree with the specified doctree name