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+title: Embark 5.1
+author: iuri_matias
+summary: "Embark 5.1 release"
+categories:
+  - announcements
+  - releases
+layout: blog-post
+---
+
+Embark 5.1
+===
+
+## Interfaces & Libraries Configuration
+
+Embark 5.1 adds two new configuration settings for Smart Contract configuration:
+
+`interfaces` - Any Smart Contract that represent an interface or is used for inheritance
+`libraries` - Any Smart Contract that is used as a library
+
+This makes the configuration less redundant in cases where otherwise the deploy property has been set to false, such as:
+
+```
+deploy: {
+  Ownable: {
+    deploy: false
+  },
+  ...
+}
+```
+
+The above can now be done via:
+
+```
+interfaces: ['Ownable'],
+deploy: {
+  ...
+}
+```
+
+Find the complete documentation [here](https://framework.embarklabs.io/docs/contracts_configuration.html#Defining-interfaces).
+
+## getEvmVersion for conditional tests
+
+Embark tests now include a helper `getEvmVersion` that can be used to consult what EVM the tests are being run on. This is useful when you have certain tests that can only be run in a particular type of node, but you still want to be able to run tests everywhere without them breaking.
+
+For example:
+
+```
+  it("cannot bid after 5 minutes", async () => {
+    const evmVersion = await global.getEvmVersion();
+    if (evmVersion.indexOf("TestRPC") === -1) return;
+
+    increaseTime(5000)
+
+    await assert.reverts(Auction.methods.bid(), {from: web3.eth.defaultAccount}, 'Returned error: VM Exception while processing transaction: cannot bid after auction expired');
+  })
+```
+
+## Nethermind plugin
+
+Embark now comes with a [Nethermind](https://nethermind.io/) plugin.
+More info about the plugin can be found [here](https://github.com/embarklabs/embark/tree/master/packages/plugins/nethermind)
+
+## Changelog
+
+Features
+@embark/deployment: introduce interfaces and libraries configuration (73d0443)
+@embark/nethermind: add Nethermind blockchain client plugin (6db8d87)
+@embark/test-runner: expose evmClientVersion for conditional tests (e37d3f7)
+@embark/testing: introduce proper request2 api for async/await (c947517)
+@embark/testing: add missing APIs to register console commands and API calls (bef582d)
+support Node.js v12.x and newer (c093cf8)
+
+Bug Fixes
+@embark/cmd_controller: fix build command to escape on finish (e2767c2)
+@embark/debugger: Prevent error if contract not tracked by Embark (1e1172e)
+@embark/ens: fix Infura connection and testnet use of ENS (42bd3b7)
+@embark/test-dapp: fix test_dapp broken for ENS resolve (f5849e0)
+@embark/tests: Fix failing test with —node=embark (81af3af)
+@embark/transaction-logger: Circular JSON log and unknown contract log level (5843a8e)
+@embark/utils: fix deconstruct url to return port as an integer (4190d5e)
+transaction-logger: fix circular dep issue with util.inspect (6f239f4)
+@embark/embarkjs: change enableEthereum to not rely on returned accounts array (b8f93ea)
+@embark/test: increase default gas limit to 8M so tests support bigger contracts (b6856b2)
+@embark/ens: connect to web3 only with dappAutoEnable is true (e0ac539)
+@embark/proxy: Parse rpcPort from config as integer (9f7c682)