diff --git a/.solcover.js b/.solcover.js
index 7baa7a6..93bbdb9 100644
--- a/.solcover.js
+++ b/.solcover.js
@@ -1,14 +1,11 @@
 module.exports = {
     norpc: true,
-    copyPackages: ['@aragon/os'],
     skipFiles: [
         'IFIFSResolvingRegistrar.sol',
-        'ens/IPublicResolver.sol',
+        'ens/',
         'interface/ApproveAndCallReceiver.sol',
         'misc/Migrations.sol',
-        'zeppelin/ERC20.sol',
-        'zeppelin/ERC20Basic.sol',
-        'zeppelin/Ownable.sol',
+        'zeppelin/',
         'test/',
     ]
 }
diff --git a/contracts/FIFSResolvingRegistrar.sol b/contracts/FIFSResolvingRegistrar.sol
index 1fb7804..2fc5604 100644
--- a/contracts/FIFSResolvingRegistrar.sol
+++ b/contracts/FIFSResolvingRegistrar.sol
@@ -1,6 +1,6 @@
 pragma solidity 0.4.24;
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "./ens/AbstractENS.sol";
 import "./ens/IPublicResolver.sol";
 import "./IFIFSResolvingRegistrar.sol";
 
diff --git a/contracts/ens/AbstractENS.sol b/contracts/ens/AbstractENS.sol
new file mode 100644
index 0000000..497343b
--- /dev/null
+++ b/contracts/ens/AbstractENS.sol
@@ -0,0 +1,24 @@
+pragma solidity ^0.4.15;
+
+
+interface AbstractENS {
+    function owner(bytes32 _node) public constant returns (address);
+    function resolver(bytes32 _node) public constant returns (address);
+    function ttl(bytes32 _node) public constant returns (uint64);
+    function setOwner(bytes32 _node, address _owner) public;
+    function setSubnodeOwner(bytes32 _node, bytes32 label, address _owner) public;
+    function setResolver(bytes32 _node, address _resolver) public;
+    function setTTL(bytes32 _node, uint64 _ttl) public;
+
+    // Logged when the owner of a node assigns a new owner to a subnode.
+    event NewOwner(bytes32 indexed _node, bytes32 indexed _label, address _owner);
+
+    // Logged when the owner of a node transfers ownership to a new account.
+    event Transfer(bytes32 indexed _node, address _owner);
+
+    // Logged when the resolver for a node changes.
+    event NewResolver(bytes32 indexed _node, address _resolver);
+
+    // Logged when the TTL of a node changes
+    event NewTTL(bytes32 indexed _node, uint64 _ttl);
+}
diff --git a/contracts/test/ens/ENS.sol b/contracts/test/ens/ENS.sol
index c519b38..6923f18 100644
--- a/contracts/test/ens/ENS.sol
+++ b/contracts/test/ens/ENS.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "../../ens/AbstractENS.sol";
 
 
 /**
diff --git a/contracts/test/ens/FIFSRegistrar.sol b/contracts/test/ens/FIFSRegistrar.sol
index ad1cfeb..f8bf50b 100644
--- a/contracts/test/ens/FIFSRegistrar.sol
+++ b/contracts/test/ens/FIFSRegistrar.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "../../ens/AbstractENS.sol";
 
 /**
  * A registrar that allocates subdomains to the first person to claim them.
diff --git a/contracts/test/ens/PublicResolver.sol b/contracts/test/ens/PublicResolver.sol
index 4586c76..181af4e 100644
--- a/contracts/test/ens/PublicResolver.sol
+++ b/contracts/test/ens/PublicResolver.sol
@@ -1,6 +1,6 @@
 pragma solidity ^0.4.0;
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "../../ens/AbstractENS.sol";
 
 /**
  * A simple resolver anyone can use; only allows the owner of a node to set its
diff --git a/contracts/test/ens/Registrar.sol b/contracts/test/ens/Registrar.sol
index b982396..6e7997a 100644
--- a/contracts/test/ens/Registrar.sol
+++ b/contracts/test/ens/Registrar.sol
@@ -14,7 +14,7 @@ The plan is to test the basic features and then move to a new contract in at mos
 */
 
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "../../ens/AbstractENS.sol";
 
 
 /**
diff --git a/contracts/test/mocks/MockResolver.sol b/contracts/test/mocks/MockResolver.sol
index 58ddecc..988d453 100644
--- a/contracts/test/mocks/MockResolver.sol
+++ b/contracts/test/mocks/MockResolver.sol
@@ -1,6 +1,6 @@
 pragma solidity 0.4.24;
 
-import "@aragon/os/contracts/lib/ens/AbstractENS.sol";
+import "../../ens/AbstractENS.sol";
 
 
 contract MockResolver {
diff --git a/package.json b/package.json
index 7e570f3..eca97d3 100644
--- a/package.json
+++ b/package.json
@@ -45,8 +45,5 @@
     "solidity-coverage": "^0.5.8",
     "truffle": "4.1.14",
     "truffle-hdwallet-provider": "0.0.3"
-  },
-  "dependencies": {
-    "@aragon/os": "4.0.0-beta.2"
   }
 }