diff --git a/Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj b/Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj
index 6e59389..4414eb0 100644
--- a/Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj
+++ b/Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj
@@ -44,7 +44,7 @@
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.2.0.0-preview.63\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.Hardware.Esp32, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.2.0.0-preview.16\lib\netnano1.0\nanoFramework.Hardware.Esp32.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.2.0.0-preview.18\lib\netnano1.0\nanoFramework.Hardware.Esp32.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.Runtime.Events, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.Runtime.Events.2.0.0-preview.19\lib\netnano1.0\nanoFramework.Runtime.Events.dll</HintPath>
diff --git a/Tests/UnitTestsSerialPort/packages.config b/Tests/UnitTestsSerialPort/packages.config
index bcef824..4b089a4 100644
--- a/Tests/UnitTestsSerialPort/packages.config
+++ b/Tests/UnitTestsSerialPort/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.63" targetFramework="netnano1.0" />
-  <package id="nanoFramework.Hardware.Esp32" version="2.0.0-preview.16" targetFramework="netnano1.0" />
+  <package id="nanoFramework.Hardware.Esp32" version="2.0.0-preview.18" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Events" version="2.0.0-preview.19" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="2.0.0-preview.29" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="2.0.0-preview.37" targetFramework="netnano1.0" />
diff --git a/Tests/UnitTestsSerialPort/packages.lock.json b/Tests/UnitTestsSerialPort/packages.lock.json
index a3a71d5..dba9a0f 100644
--- a/Tests/UnitTestsSerialPort/packages.lock.json
+++ b/Tests/UnitTestsSerialPort/packages.lock.json
@@ -10,9 +10,9 @@
       },
       "nanoFramework.Hardware.Esp32": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.16, 2.0.0-preview.16]",
-        "resolved": "2.0.0-preview.16",
-        "contentHash": "oUs728kr8EWz82n1z3IDmztYvYtVc39lLDqJwqrRPbHn0uxnR6ShfyLbXgvKQ9ClqnsAa9GIykcyEuv7PYMJfg=="
+        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
+        "resolved": "2.0.0-preview.18",
+        "contentHash": "qKcxx8jU0RDzwQ4uMM9vxrdvnxANYaD+HrWwndI85o3gXVvEAPj/sdThMZLehbWSAChE06eTuJm2N/3T4Elkdw=="
       },
       "nanoFramework.Runtime.Events": {
         "type": "Direct",