diff --git a/package.json b/package.json
index 113dca5..4df0f0d 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "mocha": "^5.0.1",
     "mocha-better-spec-reporter": "^3.1.0",
     "mocha-parallel-tests": "^1.2.10",
+    "portfinder": "^1.0.13",
     "truffle": "^4.0.5",
     "truffle-artifactor": "^3.0.3",
     "truffle-compile": "^3.0.5",
diff --git a/src/cli.js b/src/cli.js
index d72156d..25bba99 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -12,6 +12,7 @@ program
   .option("-w, --watch", "Watch tests")
   .option("-v, --verbose", "Verbose tests")
   .option("-f, --fun", "Fun tests")
+  .option("-p, --port [port]", "Port number to launch test RPC on")
   .action(function(path) {
     testPath = path;
   })
@@ -29,8 +30,9 @@ if (program.watch) {
 
 const instance = new Espresso({
   testPath,
-  watch: program.watch,
-  reporter
+  reporter,
+  port: program.port,
+  watch: program.watch
 });
 
 global = Object.assign(global, instance.globalScope);
diff --git a/src/espresso.js b/src/espresso.js
index e51a173..64d86cd 100644
--- a/src/espresso.js
+++ b/src/espresso.js
@@ -24,7 +24,9 @@ export default class Espresso {
     this.testPath = options.testPath || ".";
     this.watch = options.watch;
     this.reporter = options.reporter;
-    this.server = new Server();
+    this.server = new Server({
+      port: options.port
+    });
     this.mocha = new MochaParallel();
     //this.mocha = new Mocha();
   }
diff --git a/src/server.js b/src/server.js
index 52f37c3..d1187f5 100644
--- a/src/server.js
+++ b/src/server.js
@@ -1,22 +1,27 @@
 import Ganache from "ganache-core";
 import Web3 from "web3";
 import { Profiler, Contracts, Migrate } from "./truffle/external";
+import portfinder from "portfinder";
 
 export default class Server {
-  constructor() {
+  constructor(options = {}) {
     this.ganache = Ganache.server({
       default_balance_ether: 1000
     });
     this.web3 = new Web3();
     this.accounts = [];
+    portfinder.basePort = options.port || 8545;
   }
 
   async start() {
-    await this.ganache.listen(8545, (err, chain) => {
-      if (err) {
-        console.log("Error: ", err);
-      }
-    });
+    this.port = await portfinder.getPortPromise();
+
+    try {
+      await this.ganache.listen(this.port);
+      console.log("Launched test RPC on port: ", this.port);
+    } catch (err) {
+      console.log("Error: ", err);
+    }
     this.web3.setProvider(this.ganache.provider);
     this.accounts = await this.getAccounts();
   }
diff --git a/yarn.lock b/yarn.lock
index 2971da0..9a2d9cb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3396,7 +3396,7 @@ mississippi@^2.0.0:
     stream-each "^1.1.0"
     through2 "^2.0.0"
 
-mkdirp@0.5.1, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkdirp@~0.5.1:
+mkdirp@0.5.1, mkdirp@0.5.x, "mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkdirp@~0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
@@ -4093,6 +4093,14 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
+portfinder@^1.0.13:
+  version "1.0.13"
+  resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.13.tgz#bb32ecd87c27104ae6ee44b5a3ccbf0ebb1aede9"
+  dependencies:
+    async "^1.5.2"
+    debug "^2.2.0"
+    mkdirp "0.5.x"
+
 prepend-file@^1.3.1:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/prepend-file/-/prepend-file-1.3.1.tgz#83b16e0b4ac1901fce88dbd945a22f4cc81df579"