diff --git a/cmd/checkpoint-admin/exec.go b/cmd/checkpoint-admin/exec.go
index 457f876503..73c4fa946f 100644
--- a/cmd/checkpoint-admin/exec.go
+++ b/cmd/checkpoint-admin/exec.go
@@ -75,7 +75,6 @@ var commandPublish = cli.Command{
 	Flags: []cli.Flag{
 		nodeURLFlag,
 		indexFlag,
-		signersFlag,
 		signaturesFlag,
 		keyFileFlag,
 		utils.PasswordFileFlag,
diff --git a/contracts/registrar/contract/registrar.go b/contracts/registrar/contract/registrar.go
index 6b0af64da3..757d7c5c4e 100644
--- a/contracts/registrar/contract/registrar.go
+++ b/contracts/registrar/contract/registrar.go
@@ -31,7 +31,7 @@ var (
 const ContractABI = "[{\"constant\":true,\"inputs\":[],\"name\":\"GetAllAdmin\",\"outputs\":[{\"name\":\"\",\"type\":\"address[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"GetLatestCheckpoint\",\"outputs\":[{\"name\":\"\",\"type\":\"uint64\"},{\"name\":\"\",\"type\":\"bytes32\"},{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"_recentNumber\",\"type\":\"uint256\"},{\"name\":\"_recentHash\",\"type\":\"bytes32\"},{\"name\":\"_hash\",\"type\":\"bytes32\"},{\"name\":\"_sectionIndex\",\"type\":\"uint64\"},{\"name\":\"v\",\"type\":\"uint8[]\"},{\"name\":\"r\",\"type\":\"bytes32[]\"},{\"name\":\"s\",\"type\":\"bytes32[]\"}],\"name\":\"SetCheckpoint\",\"outputs\":[{\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"_adminlist\",\"type\":\"address[]\"},{\"name\":\"_sectionSize\",\"type\":\"uint256\"},{\"name\":\"_processConfirms\",\"type\":\"uint256\"},{\"name\":\"_threshold\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"index\",\"type\":\"uint64\"},{\"indexed\":false,\"name\":\"checkpointHash\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"v\",\"type\":\"uint8\"},{\"indexed\":false,\"name\":\"r\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"s\",\"type\":\"bytes32\"}],\"name\":\"NewCheckpointVote\",\"type\":\"event\"}]"
 
 // ContractBin is the compiled bytecode used for deploying new contracts.
-const ContractBin = `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`
+const ContractBin = `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`
 
 // DeployContract deploys a new Ethereum contract, binding an instance of Contract to it.
 func DeployContract(auth *bind.TransactOpts, backend bind.ContractBackend, _adminlist []common.Address, _sectionSize *big.Int, _processConfirms *big.Int, _threshold *big.Int) (common.Address, *types.Transaction, *Contract, error) {
diff --git a/contracts/registrar/contract/registrar.sol b/contracts/registrar/contract/registrar.sol
index 434f4e3a77..0702a406f3 100644
--- a/contracts/registrar/contract/registrar.sol
+++ b/contracts/registrar/contract/registrar.sol
@@ -1,4 +1,4 @@
-pragma solidity ^0.5.2;
+pragma solidity ^0.5.10;
 
 /**
  * @title Registrar
diff --git a/params/config.go b/params/config.go
index 8f1a0feb44..1fdff429bd 100644
--- a/params/config.go
+++ b/params/config.go
@@ -126,7 +126,7 @@ var (
 
 	// RinkebyCheckpointOracle contains a set of configs for the Rinkeby test network oracle.
 	RinkebyCheckpointOracle = &CheckpointOracleConfig{
-		Address: common.HexToAddress("0x62652ed8e969ce7bd5e3dd13590efa1e569215f1"),
+		Address: common.HexToAddress("0x087757e605fcad9febaa2f6553768fafda08ac0d"),
 		Signers: []common.Address{
 			common.HexToAddress("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3"), // Peter
 			common.HexToAddress("0x78d1ad571a1a09d60d9bbf25894b44e4c8859595"), // Martin