diff --git a/.solcover.js b/.solcover.js
index 890c158..b96cae4 100644
--- a/.solcover.js
+++ b/.solcover.js
@@ -1,4 +1,3 @@
 module.exports = {
-  skipFiles: ['imports', 'mocks'],
-  deepSkip: true
+  skipFiles: ['imports']
 };
diff --git a/contracts/Master.sol b/contracts/Master.sol
index b45095b..68abd32 100644
--- a/contracts/Master.sol
+++ b/contracts/Master.sol
@@ -99,6 +99,14 @@ contract Master is Ownable {
         changeAllAddress();
     }
 
+    /// @dev upgrades a single contract
+    function upgradeContract(bytes2 _contractsName, address _contractsAddress) public {
+        require(isAuth());
+        allContractVersions[versionDates.length - 1][_contractsName] = _contractsAddress;
+        changeMasterAddress(address(this));
+        changeAllAddress();
+    }
+
     /// @dev sets dAppTokenProxy address
     /// @param _dAppTokenProxy token proxy address
     function setDAppTokenProxy(address _dAppTokenProxy) public {
diff --git a/package-lock.json b/package-lock.json
index 311b004..c4a261f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4238,7 +4238,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4447,7 +4448,8 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
@@ -4472,6 +4474,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4651,7 +4654,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4707,6 +4711,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4750,12 +4755,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
diff --git a/test/08_Master.js b/test/08_Master.js
index 288274b..873257f 100644
--- a/test/08_Master.js
+++ b/test/08_Master.js
@@ -139,6 +139,18 @@ contract('Master', function([owner, notOwner]) {
     assert.equal(b.toNumber() + 10, b2.toNumber() - b1.toNumber());
   });
 
+  it('Should upgrade contract', async function() {
+    this.timeout(100000);
+    const poo = await Pool.new();
+    await ms.upgradeContract('PL', poo.address);
+    assert(
+      await ms.getLatestAddress('PL'),
+      poo.address,
+      'contract not upgraded'
+    );
+    await catchRevert(ms.upgradeContract('PL', owner, { from: notOwner }));
+  });
+
   it('Should add new contract', async function() {
     this.timeout(100000);
     // Will throw once owner's permissions are removed. will need to create proposal then.