diff --git a/.github/workflows/cont_integration.yml b/.github/workflows/cont_integration.yml
index 350a128..a7ee31c 100644
--- a/.github/workflows/cont_integration.yml
+++ b/.github/workflows/cont_integration.yml
@@ -51,9 +51,8 @@ jobs:
       if: matrix.rust.version == '1.75.0'
       run: |
         cargo update -p minreq --precise "2.13.2"
-        cargo update -p home --precise "0.5.9"
-        cargo update -p native-tls --precise "0.2.13"
         cargo update -p idna_adapter --precise "1.2.0"
+        cargo update -p native-tls --precise "0.2.13"
         cargo update -p zerofrom --precise "0.1.5"
         cargo update -p litemap --precise "0.7.4"
     - name: Build
diff --git a/Cargo.toml b/Cargo.toml
index d474ea0..55f51ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ tokio = { version = "1", features = ["time"], optional = true }
 
 [dev-dependencies]
 tokio = { version = "1.20.1", features = ["full"] }
-electrsd = { version = "0.33.0", features = ["legacy", "esplora_a33e97e1", "corepc-node_28_0"] }
+electrsd = { version = "0.36.1", features = ["legacy", "esplora_a33e97e1", "corepc-node_29_0"] }
 lazy_static = "1.4.0"
 
 [features]
diff --git a/README.md b/README.md
index 278b66f..61d0acc 100644
--- a/README.md
+++ b/README.md
@@ -20,9 +20,8 @@ To build with the MSRV you will need to pin dependencies as follows:
 
 ```shell
 cargo update -p minreq --precise "2.13.2"
-cargo update -p home --precise "0.5.9"
-cargo update -p native-tls --precise "0.2.13"
 cargo update -p idna_adapter --precise "1.2.0"
+cargo update -p native-tls --precise "0.2.13"
 cargo update -p zerofrom --precise "0.1.5"
 cargo update -p litemap --precise "0.7.4"
 ```
diff --git a/src/async.rs b/src/async.rs
index 9f8e854..6c6718a 100644
--- a/src/async.rs
+++ b/src/async.rs
@@ -394,6 +394,11 @@ impl<S: Sleeper> AsyncClient<S> {
         maxfeerate: Option<f64>,
         maxburnamount: Option<f64>,
     ) -> Result<SubmitPackageResult, Error> {
+        let serialized_txs = transactions
+            .iter()
+            .map(|tx| serialize_hex(&tx))
+            .collect::<Vec<_>>();
+
         let mut queryparams = HashSet::<(&str, String)>::new();
         if let Some(maxfeerate) = maxfeerate {
             queryparams.insert(("maxfeerate", maxfeerate.to_string()));
@@ -402,15 +407,10 @@ impl<S: Sleeper> AsyncClient<S> {
             queryparams.insert(("maxburnamount", maxburnamount.to_string()));
         }
 
-        let serialized_txs = transactions
-            .iter()
-            .map(|tx| serialize_hex(&tx))
-            .collect::<Vec<_>>();
-
         let response = self
             .post_request_bytes(
                 "/txs/package",
-                serde_json::to_string(&serialized_txs).unwrap_or_default(),
+                serde_json::to_string(&serialized_txs).map_err(Error::SerdeJson)?,
                 Some(queryparams),
             )
             .await?;
diff --git a/src/blocking.rs b/src/blocking.rs
index 3e68e6c..aa5a8bc 100644
--- a/src/blocking.rs
+++ b/src/blocking.rs
@@ -332,7 +332,7 @@ impl BlockingClient {
         let mut request = self.post_request(
             "/txs/package",
             serde_json::to_string(&serialized_txs)
-                .unwrap_or_default()
+                .map_err(Error::SerdeJson)?
                 .into_bytes(),
         )?;
 
diff --git a/src/lib.rs b/src/lib.rs
index d5bb38c..e56d27c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -204,10 +204,12 @@ impl Builder {
 pub enum Error {
     /// Error during `minreq` HTTP request
     #[cfg(feature = "blocking")]
-    Minreq(::minreq::Error),
-    /// Error during reqwest HTTP request
+    Minreq(minreq::Error),
+    /// Error during `reqwest` HTTP request
     #[cfg(feature = "async")]
-    Reqwest(::reqwest::Error),
+    Reqwest(reqwest::Error),
+    /// Error during JSON (de)serialization
+    SerdeJson(serde_json::Error),
     /// HTTP response error
     HttpResponse {
         /// The HTTP status code returned by the server.
@@ -263,6 +265,7 @@ impl std::error::Error for Error {}
 impl_error!(::minreq::Error, Minreq, Error);
 #[cfg(feature = "async")]
 impl_error!(::reqwest::Error, Reqwest, Error);
+impl_error!(serde_json::Error, SerdeJson, Error);
 impl_error!(std::num::ParseIntError, Parsing, Error);
 impl_error!(bitcoin::consensus::encode::Error, BitcoinEncoding, Error);
 impl_error!(bitcoin::hex::HexToArrayError, HexToArray, Error);