diff --git a/testnet/stacks-node/src/burnchains/bitcoin_regtest_controller.rs b/testnet/stacks-node/src/burnchains/bitcoin_regtest_controller.rs
index 8b23d48c1f6..04f49b5dbf9 100644
--- a/testnet/stacks-node/src/burnchains/bitcoin_regtest_controller.rs
+++ b/testnet/stacks-node/src/burnchains/bitcoin_regtest_controller.rs
@@ -802,8 +802,12 @@ impl BitcoinRegtestController {
     ) -> Option<Transaction> {
         let public_key = signer.get_public_key();
 
-        let btc_miner_fee = self.config.burnchain.leader_key_tx_estimated_size
-            * self.config.burnchain.satoshis_per_byte;
+        // reload the config to find satoshis_per_byte changes
+        let satoshis_per_byte = match self.config.get_burnchain_config() {
+            Ok(s) => s.satoshis_per_byte,
+            Err(_) => self.config.burnchain.satoshis_per_byte,
+        };
+        let btc_miner_fee = self.config.burnchain.leader_key_tx_estimated_size * satoshis_per_byte;
         let budget_for_outputs = DUST_UTXO_LIMIT;
         let total_required = btc_miner_fee + budget_for_outputs;
 
@@ -831,7 +835,7 @@ impl BitcoinRegtestController {
 
         tx.output = vec![consensus_output];
 
-        let fee_rate = self.config.burnchain.satoshis_per_byte;
+        let fee_rate = satoshis_per_byte;
 
         self.finalize_tx(
             epoch_id,
diff --git a/testnet/stacks-node/src/config.rs b/testnet/stacks-node/src/config.rs
index c7b47f2aadf..987f0cf27d4 100644
--- a/testnet/stacks-node/src/config.rs
+++ b/testnet/stacks-node/src/config.rs
@@ -48,6 +48,7 @@ const INV_REWARD_CYCLES_TESTNET: u64 = 6;
 
 #[derive(Clone, Deserialize, Default, Debug)]
 pub struct ConfigFile {
+    pub path: Option<String>,
     pub burnchain: Option<BurnchainConfigFile>,
     pub node: Option<NodeConfigFile>,
     pub ustx_balance: Option<Vec<InitialBalanceFile>>,
@@ -178,7 +179,9 @@ mod tests {
 impl ConfigFile {
     pub fn from_path(path: &str) -> Result<ConfigFile, String> {
         let content = fs::read_to_string(path).map_err(|e| format!("Invalid path: {}", &e))?;
-        Self::from_str(&content)
+        let mut f = Self::from_str(&content)?;
+        f.path = Some(path.to_string());
+        Ok(f)
     }
 
     pub fn from_str(content: &str) -> Result<ConfigFile, String> {
@@ -353,6 +356,7 @@ impl ConfigFile {
 
 #[derive(Clone, Debug)]
 pub struct Config {
+    pub config_path: Option<String>,
     pub burnchain: BurnchainConfig,
     pub node: NodeConfig,
     pub initial_balances: Vec<InitialBalance>,
@@ -394,6 +398,16 @@ lazy_static! {
 }
 
 impl Config {
+    /// get the up-to-date burnchain from the config
+    pub fn get_burnchain_config(&self) -> Result<BurnchainConfig, String> {
+        if let Some(path) = &self.config_path {
+            let config_file = ConfigFile::from_path(path.as_str())?;
+            let config = Config::from_config_file(config_file)?;
+            Ok(config.burnchain)
+        } else {
+            Ok(self.burnchain.clone())
+        }
+    }
     /// Apply any test settings to this burnchain config struct
     fn apply_test_settings(&self, burnchain: &mut Burnchain) {
         if self.burnchain.get_bitcoin_network().1 == BitcoinNetworkType::Mainnet {
@@ -1148,6 +1162,7 @@ impl Config {
         };
 
         Ok(Config {
+            config_path: config_file.path,
             node,
             burnchain,
             initial_balances,
@@ -1308,6 +1323,7 @@ impl std::default::Default for Config {
         let estimation = FeeEstimationConfig::default();
 
         Config {
+            config_path: None,
             burnchain,
             node,
             initial_balances: vec![],
@@ -1386,7 +1402,6 @@ impl BurnchainConfig {
             ast_precheck_size_height: None,
         }
     }
-
     pub fn get_rpc_url(&self, wallet: Option<String>) -> String {
         let scheme = match self.rpc_ssl {
             true => "https://",