diff --git a/Cargo.toml b/Cargo.toml
index 4bafeef..4e375b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "firebase-messaging-rs"
-version = "0.6.1"
+version = "0.7.0"
 authors = [
   "Yoichiro ITO <contact.110416@gmail.com>"
 ]
diff --git a/src/lib.rs b/src/lib.rs
index a283c9a..06a2f32 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,9 @@
 pub mod topic;
 
 use async_trait::async_trait;
-use gcloud_sdk::{GoogleAuthTokenGenerator, TokenSourceType, GCP_DEFAULT_SCOPES};
+use gcloud_sdk::{
+    google::devtools::source, GoogleAuthTokenGenerator, TokenSourceType, GCP_DEFAULT_SCOPES,
+};
 use http::{
     header::{ACCEPT, AUTHORIZATION, CONTENT_LENGTH, CONTENT_TYPE},
     Request, Response, StatusCode,
@@ -147,8 +149,12 @@ pub trait GenericGoogleRestAPISupport {
                     .await
                     .map_err(|_| RPCError::DecodeFailure)
                     .map_err(E::from)?;
+                let text = std::str::from_utf8(&buf).unwrap_or_default();
                 serde_json::from_slice::<R>(&buf)
-                    .map_err(|_| RPCError::DeserializeFailure)
+                    .map_err(|e| RPCError::DeserializeFailure {
+                        reason: format!("{e:?}"),
+                        source: text.to_string(),
+                    })
                     .map_err(E::from)
             }
             StatusCode::UNAUTHORIZED => {
@@ -171,7 +177,7 @@ pub enum RPCError {
     BuildRequestFailure(String),
     HttpRequestFailure,
     DecodeFailure,
-    DeserializeFailure,
+    DeserializeFailure { reason: String, source: String },
     InvalidRequest,
     Internal,
     Unknown(u16),
diff --git a/src/topic.rs b/src/topic.rs
index 3c8908c..a071c9e 100644
--- a/src/topic.rs
+++ b/src/topic.rs
@@ -148,8 +148,8 @@ impl From<RPCError> for TopicManagementError {
             RPCError::DecodeFailure => Self::InternalResponseError {
                 msg: "unable to decode response body bytes".to_string(),
             },
-            RPCError::DeserializeFailure => Self::InternalResponseError {
-                msg: "unable to deserialize response body to type".to_string(),
+            RPCError::DeserializeFailure { reason, source } => Self::InternalResponseError {
+                msg: format!("unable to deserialize response body to type: {reason}: {source}"),
             },
             RPCError::Unauthorized(msg) => Self::Unauthorized(msg),
             RPCError::InvalidRequest => Self::InvalidRequest,