diff --git a/CHANGELOG.md b/CHANGELOG.md
index c312dfb..920bf96 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.2] - 2026-03-10
+
+### Fixed
+
+- Prevent command parsing from panicking on non-ASCII sheet names such as `:addsheet 测试1`
+
 ## [0.4.1] - 2026-03-10
 
 ### Fixed
@@ -92,7 +98,8 @@ This is the initial release of excel-cli, a lightweight terminal-based Excel vie
 - Copy, cut, and paste functionality with `y`, `d`, and `p` keys
 - Support for pipe operator when exporting to JSON
 
-[Unreleased]: https://github.com/fuhan666/excel-cli/compare/v0.4.1...HEAD
+[Unreleased]: https://github.com/fuhan666/excel-cli/compare/v0.4.2...HEAD
+[0.4.2]: https://github.com/fuhan666/excel-cli/releases/tag/v0.4.2
 [0.4.1]: https://github.com/fuhan666/excel-cli/releases/tag/v0.4.1
 [0.4.0]: https://github.com/fuhan666/excel-cli/releases/tag/v0.4.0
 [0.3.0]: https://github.com/fuhan666/excel-cli/releases/tag/v0.3.0
diff --git a/Cargo.lock b/Cargo.lock
index a7ea831..ae70c72 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -311,7 +311,7 @@ checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
 [[package]]
 name = "excel-cli"
-version = "0.4.1"
+version = "0.4.2"
 dependencies = [
  "anyhow",
  "calamine",
diff --git a/Cargo.toml b/Cargo.toml
index bb033c1..10a0c4e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "excel-cli"
-version = "0.4.1"
+version = "0.4.2"
 edition = "2021"
 description = "A lightweight terminal-based Excel viewer with Vim-like navigation for viewing, editing, and exporting Excel data to JSON format."
 license = "MIT"
diff --git a/src/commands/executor.rs b/src/commands/executor.rs
index a1bd699..f49ae8d 100644
--- a/src/commands/executor.rs
+++ b/src/commands/executor.rs
@@ -366,25 +366,21 @@ impl AppState<'_> {
 // Parse a cell reference like "A1", "B10", etc.
 fn parse_cell_reference(input: &str) -> Option<(usize, usize)> {
     // Cell references should have at least 2 characters (e.g., A1)
-    if input.len() < 2 {
+    if input.chars().count() < 2 {
         return None;
     }
 
     // Find the first digit to separate column and row parts
-    let mut col_end = 0;
-    for (i, c) in input.chars().enumerate() {
-        if c.is_ascii_digit() {
-            col_end = i;
-            break;
-        }
-    }
+    let col_end = input
+        .char_indices()
+        .find(|(_, c)| c.is_ascii_digit())
+        .map(|(index, _)| index)?;
 
     if col_end == 0 {
         return None; // No digits found
     }
 
-    let col_part = &input[0..col_end];
-    let row_part = &input[col_end..];
+    let (col_part, row_part) = input.split_at(col_end);
 
     // Convert column letters to index
     let col = col_name_to_index(&col_part.to_uppercase())?;
@@ -394,3 +390,20 @@ fn parse_cell_reference(input: &str) -> Option<(usize, usize)> {
 
     Some((row, col))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::parse_cell_reference;
+
+    #[test]
+    fn parses_valid_cell_references() {
+        assert_eq!(parse_cell_reference("A1"), Some((1, 1)));
+        assert_eq!(parse_cell_reference("BC12"), Some((12, 55)));
+    }
+
+    #[test]
+    fn ignores_commands_with_non_ascii_arguments() {
+        assert_eq!(parse_cell_reference("addsheet 测试1"), None);
+        assert_eq!(parse_cell_reference("测试1"), None);
+    }
+}