diff --git a/lib/config.go b/lib/config.go
index d5db083..3c8b85d 100644
--- a/lib/config.go
+++ b/lib/config.go
@@ -24,6 +24,7 @@ var (
 	libConfig  *Config
 	sdkConfig  *sdk.Config
 	initConfig sync.Once
+	changeLock sync.Mutex
 )
 
 // DefaultConfig returns library default configuration.
@@ -42,6 +43,8 @@ func DefaultConfig() *Config {
 // GetConfig returns the config instance for the SDK.
 func GetConfig() *Config {
 	initConfig.Do(func() {
+		changeLock.Lock()
+		defer changeLock.Unlock()
 		libConfig = DefaultConfig()
 		sdkConfig = sdk.GetConfig()
 		libConfig.SetBech32PrefixForAccount("plmnt")
@@ -54,48 +57,64 @@ func GetConfig() *Config {
 
 // SetBech32PrefixForAccount sets the bech32 account prefix.
 func (config *Config) SetBech32PrefixForAccount(bech32Prefix string) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	sdkConfig.SetBech32PrefixForAccount(bech32Prefix, "pub")
 	return config
 }
 
 // SetEncodingConfig sets the encoding config and must not be nil.
 func (config *Config) SetEncodingConfig(encodingConfig params.EncodingConfig) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.EncodingConfig = encodingConfig
 	return config
 }
 
 // SetChainID sets the chain ID parameter.
 func (config *Config) SetChainID(chainID string) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.ChainID = chainID
 	return config
 }
 
 // SetClientCtx sets the client context parameter.
 func (config *Config) SetClientCtx(clientCtx client.Context) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.ClientCtx = clientCtx
 	return config
 }
 
 // SetFeeDenom sets the fee denominator parameter.
 func (config *Config) SetFeeDenom(feeDenom string) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.FeeDenom = feeDenom
 	return config
 }
 
 // SetRoot sets the root directory where to find the keyring.
 func (config *Config) SetRoot(root string) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.RootDir = root
 	return config
 }
 
 // SetRPCEndpoint sets the RPC endpoint to send requests to.
 func (config *Config) SetRPCEndpoint(rpcEndpoint string) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.RPCEndpoint = rpcEndpoint
 	return config
 }
 
 // SetTxGas sets the amount of Gas for the TX that is send to the network
 func (config *Config) SetTxGas(txGas uint64) *Config {
+	changeLock.Lock()
+	defer changeLock.Unlock()
 	config.TxGas = txGas
 	return config
 }
diff --git a/lib/tests/e2e/suite.go b/lib/tests/e2e/suite.go
index baf2c88..1a13545 100644
--- a/lib/tests/e2e/suite.go
+++ b/lib/tests/e2e/suite.go
@@ -61,7 +61,7 @@ func (s *E2ETestSuite) TestBankSendBroadcastTxWithFileLock() {
 	assert.Equal(s.T(), "received wrong fee denom; got: plmnt required: stake: invalid coins", txResponse.RawLog)
 
 	libConfig := lib.GetConfig()
-	libConfig.FeeDenom = "stake"
+	libConfig.SetFeeDenom("stake")
 
 	// incorrect coin
 	out, err = lib.BroadcastTxWithFileLock(val.Address, msg)
diff --git a/util/logger.go b/util/logger.go
index 4070468..abf6b2c 100644
--- a/util/logger.go
+++ b/util/logger.go
@@ -16,6 +16,7 @@ var (
 	globalApplicationLoggerTag string
 	appLogger                  *AppLogger
 	initAppLogger              sync.Once
+	syncTestingLog             sync.Mutex
 )
 
 func init() {
@@ -33,7 +34,9 @@ func GetAppLogger() *AppLogger {
 }
 
 func (logger *AppLogger) SetTestingLogger(testingLogger *testing.T) *AppLogger {
+	syncTestingLog.Lock()
 	logger.testingLogger = testingLogger
+	syncTestingLog.Unlock()
 	return logger
 }
 
@@ -49,7 +52,9 @@ func (logger *AppLogger) testingLog(msg string, keyvals ...interface{}) {
 		return
 	}
 	msg = format(msg, keyvals...)
+	syncTestingLog.Lock()
 	logger.testingLogger.Logf(msg)
+	syncTestingLog.Unlock()
 }
 
 func (logger *AppLogger) Info(ctx sdk.Context, msg string, keyvals ...interface{}) {