diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
index 762f15b9..3a8c3cc5 100644
--- a/Cargo-minimal.lock
+++ b/Cargo-minimal.lock
@@ -20,8 +20,8 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c8d66485a3a2ea485c1913c4572ce0256067a5377ac8c75c4960e1cda98605f"
 dependencies = [
- "bitcoin-internals 0.3.0",
- "bitcoin_hashes 0.14.0",
+ "bitcoin-internals",
+ "bitcoin_hashes",
 ]
 
 [[package]]
@@ -44,22 +44,16 @@ checksum = "7170e7750a20974246f17ece04311b4205a6155f1db564c5b224af817663c3ea"
 dependencies = [
  "base58ck",
  "bech32",
- "bitcoin-internals 0.3.0",
+ "bitcoin-internals",
  "bitcoin-io",
  "bitcoin-units",
- "bitcoin_hashes 0.14.0",
- "hex-conservative 0.2.0",
+ "bitcoin_hashes",
+ "hex-conservative",
  "hex_lit",
  "secp256k1",
  "serde",
 ]
 
-[[package]]
-name = "bitcoin-internals"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9425c3bf7089c983facbae04de54513cce73b41c7f9ff8c845b54e7bc64ebbfb"
-
 [[package]]
 name = "bitcoin-internals"
 version = "0.3.0"
@@ -81,20 +75,10 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cb54da0b28892f3c52203a7191534033e051b6f4b52bc15480681b57b7e036f5"
 dependencies = [
- "bitcoin-internals 0.3.0",
+ "bitcoin-internals",
  "serde",
 ]
 
-[[package]]
-name = "bitcoin_hashes"
-version = "0.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1930a4dabfebb8d7d9992db18ebe3ae2876f0a305fab206fd168df931ede293b"
-dependencies = [
- "bitcoin-internals 0.2.0",
- "hex-conservative 0.1.1",
-]
-
 [[package]]
 name = "bitcoin_hashes"
 version = "0.14.0"
@@ -102,7 +86,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb18c03d0db0247e147a21a6faafd5a7eb851c743db062de72018b6b7e8e4d16"
 dependencies = [
  "bitcoin-io",
- "hex-conservative 0.2.0",
+ "hex-conservative",
  "serde",
 ]
 
@@ -181,12 +165,6 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
-[[package]]
-name = "hex-conservative"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30ed443af458ccb6d81c1e7e661545f94d3176752fb1df2f543b902a1e0f51e2"
-
 [[package]]
 name = "hex-conservative"
 version = "0.2.0"
@@ -240,9 +218,9 @@ checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
 [[package]]
 name = "jsonrpc"
-version = "0.14.1"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8128f36b47411cd3f044be8c1f5cc0c9e24d1d1bfdc45f0a57897b32513053f2"
+checksum = "3662a38d341d77efecb73caf01420cfa5aa63c0253fd7bc05289ef9f6616e1bf"
 dependencies = [
  "base64",
  "serde",
@@ -362,7 +340,7 @@ version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e0cc0f1cf93f4969faf3ea1c7d8a9faed25918d96affa959720823dfe86d4f3"
 dependencies = [
- "bitcoin_hashes 0.13.0",
+ "bitcoin_hashes",
  "rand",
  "secp256k1-sys",
  "serde",
diff --git a/Cargo-recent.lock b/Cargo-recent.lock
index 762f15b9..3a8c3cc5 100644
--- a/Cargo-recent.lock
+++ b/Cargo-recent.lock
@@ -20,8 +20,8 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c8d66485a3a2ea485c1913c4572ce0256067a5377ac8c75c4960e1cda98605f"
 dependencies = [
- "bitcoin-internals 0.3.0",
- "bitcoin_hashes 0.14.0",
+ "bitcoin-internals",
+ "bitcoin_hashes",
 ]
 
 [[package]]
@@ -44,22 +44,16 @@ checksum = "7170e7750a20974246f17ece04311b4205a6155f1db564c5b224af817663c3ea"
 dependencies = [
  "base58ck",
  "bech32",
- "bitcoin-internals 0.3.0",
+ "bitcoin-internals",
  "bitcoin-io",
  "bitcoin-units",
- "bitcoin_hashes 0.14.0",
- "hex-conservative 0.2.0",
+ "bitcoin_hashes",
+ "hex-conservative",
  "hex_lit",
  "secp256k1",
  "serde",
 ]
 
-[[package]]
-name = "bitcoin-internals"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9425c3bf7089c983facbae04de54513cce73b41c7f9ff8c845b54e7bc64ebbfb"
-
 [[package]]
 name = "bitcoin-internals"
 version = "0.3.0"
@@ -81,20 +75,10 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cb54da0b28892f3c52203a7191534033e051b6f4b52bc15480681b57b7e036f5"
 dependencies = [
- "bitcoin-internals 0.3.0",
+ "bitcoin-internals",
  "serde",
 ]
 
-[[package]]
-name = "bitcoin_hashes"
-version = "0.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1930a4dabfebb8d7d9992db18ebe3ae2876f0a305fab206fd168df931ede293b"
-dependencies = [
- "bitcoin-internals 0.2.0",
- "hex-conservative 0.1.1",
-]
-
 [[package]]
 name = "bitcoin_hashes"
 version = "0.14.0"
@@ -102,7 +86,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb18c03d0db0247e147a21a6faafd5a7eb851c743db062de72018b6b7e8e4d16"
 dependencies = [
  "bitcoin-io",
- "hex-conservative 0.2.0",
+ "hex-conservative",
  "serde",
 ]
 
@@ -181,12 +165,6 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
-[[package]]
-name = "hex-conservative"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30ed443af458ccb6d81c1e7e661545f94d3176752fb1df2f543b902a1e0f51e2"
-
 [[package]]
 name = "hex-conservative"
 version = "0.2.0"
@@ -240,9 +218,9 @@ checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
 [[package]]
 name = "jsonrpc"
-version = "0.14.1"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8128f36b47411cd3f044be8c1f5cc0c9e24d1d1bfdc45f0a57897b32513053f2"
+checksum = "3662a38d341d77efecb73caf01420cfa5aa63c0253fd7bc05289ef9f6616e1bf"
 dependencies = [
  "base64",
  "serde",
@@ -362,7 +340,7 @@ version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e0cc0f1cf93f4969faf3ea1c7d8a9faed25918d96affa959720823dfe86d4f3"
 dependencies = [
- "bitcoin_hashes 0.13.0",
+ "bitcoin_hashes",
  "rand",
  "secp256k1-sys",
  "serde",
diff --git a/client/Cargo.toml b/client/Cargo.toml
index a9ff7ec3..65049ef4 100644
--- a/client/Cargo.toml
+++ b/client/Cargo.toml
@@ -22,7 +22,7 @@ path = "src/lib.rs"
 bitcoincore-rpc-json = { version = "0.18.0", path = "../json" }
 
 log = "0.4.5"
-jsonrpc = "0.14.0"
+jsonrpc = { version = "0.18.0", features = [] }
 
 # Used for deserialization of JSON.
 serde = "1"
diff --git a/client/src/client.rs b/client/src/client.rs
index c97a0174..2f809a79 100644
--- a/client/src/client.rs
+++ b/client/src/client.rs
@@ -1313,12 +1313,8 @@ impl RpcApi for Client {
         cmd: &str,
         args: &[serde_json::Value],
     ) -> Result<T> {
-        let raw_args: Vec<_> = args
-            .iter()
-            .map(serde_json::value::to_raw_value)
-            .map(|a| a.map_err(|e| Error::Json(e)))
-            .collect::<Result<Vec<_>>>()?;
-        let req = self.client.build_request(&cmd, &raw_args);
+        let raw = serde_json::value::to_raw_value(args)?;
+        let req = self.client.build_request(&cmd, Some(&*raw));
         if log_enabled!(Debug) {
             debug!(target: "bitcoincore_rpc", "JSON-RPC request: {} {}", cmd, serde_json::Value::from(args));
         }