diff --git a/zebra-rpc/Cargo.toml b/zebra-rpc/Cargo.toml
index e00e1b9cb9c..d06f93a94c9 100644
--- a/zebra-rpc/Cargo.toml
+++ b/zebra-rpc/Cargo.toml
@@ -43,7 +43,7 @@ jsonrpc-http-server = "18.0.0"
 num_cpus = "1.14.0"
 
 # zebra-rpc needs the preserve_order feature in serde_json, which is a dependency of jsonrpc-core
-serde_json = { version = "1.0.89", features = ["preserve_order"] }
+serde_json = { version = "1.0.89", features = ["preserve_order", "arbitrary_precision"] }
 indexmap = { version = "1.9.2", features = ["serde"] }
 
 tokio = { version = "1.23.0", features = ["time", "rt-multi-thread", "macros", "tracing"] }
diff --git a/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@mainnet_10.snap b/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@mainnet_10.snap
index b218bc58f67..67ffde393c4 100644
--- a/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@mainnet_10.snap
+++ b/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@mainnet_10.snap
@@ -5,5 +5,6 @@ expression: get_mining_info
 {
   "networksolps": 2,
   "networkhashps": 2,
-  "chain": "Mainnet"
+  "chain": "main",
+  "testnet": false
 }
diff --git a/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@testnet_10.snap b/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@testnet_10.snap
index b2637ee965d..fc728a8540f 100644
--- a/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@testnet_10.snap
+++ b/zebra-rpc/src/methods/tests/snapshot/snapshots/get_mining_info@testnet_10.snap
@@ -5,5 +5,6 @@ expression: get_mining_info
 {
   "networksolps": 0,
   "networkhashps": 0,
-  "chain": "Testnet"
+  "chain": "test",
+  "testnet": true
 }