diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1767e62..3a47f16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
+
+## [0.3.4] - 2025-09-12
 ### Added
 - `ErrorResponse::with_retry_after_duration` helper for specifying retry advice via `Duration`.
 - Conversion from `telegram_webapp_sdk::utils::validate_init_data::ValidationError` into `AppError` (feature `telegram-webapp-sdk`).
@@ -19,6 +21,7 @@ All notable changes to this project will be documented in this file.
 - Added Axum test asserting `MultipartError` becomes `AppErrorKind::BadRequest` and preserves the message.
 - Expanded Actix test to check JSON body and `Retry-After`/`WWW-Authenticate` headers.
 - Covered fallback classification of unknown messages as `TurnkeyErrorKind::Service`.
+- Expanded coverage of `telegram_webapp_sdk` mapping across all `ValidationError` variants.
 
 ## [0.3.3] - 2025-09-11
 ### Added
@@ -96,6 +99,7 @@ All notable changes to this project will be documented in this file.
 - **MSRV:** 1.89
 - **No unsafe:** the crate forbids `unsafe`.
 
+[0.3.4]: https://github.com/RAprogramm/masterror/releases/tag/v0.3.4
 [0.3.3]: https://github.com/RAprogramm/masterror/releases/tag/v0.3.3
 [0.3.2]: https://github.com/RAprogramm/masterror/releases/tag/v0.3.2
 [0.3.1]: https://github.com/RAprogramm/masterror/releases/tag/v0.3.1
diff --git a/Cargo.lock b/Cargo.lock
index 9521552..88c3414 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1324,6 +1324,18 @@ checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
 [[package]]
 name = "masterror"
 version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e7c3a243a6f697e05d0b971c22d0ac029b9080c20b2bbc5f4a3f43ea6024a60"
+dependencies = [
+ "http 1.3.1",
+ "serde",
+ "thiserror",
+ "tracing",
+]
+
+[[package]]
+name = "masterror"
+version = "0.3.4"
 dependencies = [
  "actix-web",
  "axum",
@@ -2372,7 +2384,7 @@ dependencies = [
  "hex",
  "hmac-sha256",
  "js-sys",
- "masterror 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "masterror 0.3",
  "once_cell",
  "percent-encoding",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index c5cdf04..ff5a601 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "masterror"
-version = "0.3.3"
+version = "0.3.4"
 rust-version = "1.89"
 edition = "2024"
 description = "Application error types and response mapping"
diff --git a/src/convert/telegram_webapp_sdk.rs b/src/convert/telegram_webapp_sdk.rs
index 6c2e0d7..0d85ae8 100644
--- a/src/convert/telegram_webapp_sdk.rs
+++ b/src/convert/telegram_webapp_sdk.rs
@@ -18,6 +18,9 @@
 //!
 //! ## Example
 //!
+//! ```rust
+//! # #[cfg(feature = "telegram-webapp-sdk")]
+//! # {
 //! ```rust,ignore
 //! use masterror::{AppError, AppErrorKind};
 //! use telegram_webapp_sdk::utils::validate_init_data::ValidationError;
@@ -28,6 +31,8 @@
 //!
 //! let e = convert(ValidationError::SignatureMismatch);
 //! assert!(matches!(e.kind, AppErrorKind::TelegramAuth));
+//! assert_eq!(e.message.as_deref(), Some("signature mismatch"));
+//! # }
 //! ```
 
 #[cfg(feature = "telegram-webapp-sdk")]
@@ -53,6 +58,21 @@ mod tests {
     use crate::AppErrorKind;
 
     #[test]
+    fn all_variants_map_to_telegram_auth_and_preserve_message() {
+        let cases = vec![
+            ValidationError::MissingField("hash"),
+            ValidationError::InvalidEncoding,
+            ValidationError::InvalidSignatureEncoding,
+            ValidationError::SignatureMismatch,
+            ValidationError::InvalidPublicKey,
+        ];
+
+        for case in cases {
+            let msg = case.to_string();
+            let app: AppError = case.into();
+            assert!(matches!(app.kind, AppErrorKind::TelegramAuth));
+            assert_eq!(app.message.as_deref(), Some(msg.as_str()));
+        }
     fn validation_error_maps_to_telegram_auth() {
         let err: AppError = ValidationError::SignatureMismatch.into();
         assert!(matches!(err.kind, AppErrorKind::TelegramAuth));