diff --git a/src/activities/Elsa.Activities.Rpa.Web/Services/ChromeDriverInstaller.cs b/src/activities/Elsa.Activities.Rpa.Web/Services/ChromeDriverInstaller.cs
index 24687aaa1..32e4e0be9 100644
--- a/src/activities/Elsa.Activities.Rpa.Web/Services/ChromeDriverInstaller.cs
+++ b/src/activities/Elsa.Activities.Rpa.Web/Services/ChromeDriverInstaller.cs
@@ -70,7 +70,7 @@ namespace Elsa.Activities.Rpa.Web.Services
                 throw new PlatformNotSupportedException("Your operating system is not supported.");
             }
 
-            string targetPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
+            string targetPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!;
             targetPath = Path.Combine(targetPath, driverName);
             if (!forceDownload && File.Exists(targetPath))
             {
@@ -84,7 +84,7 @@ namespace Elsa.Activities.Rpa.Web.Services
                         RedirectStandardOutput = true,
                         RedirectStandardError = true,
                     }
-                );
+                )!;
                 string existingChromeDriverVersion = await process.StandardOutput.ReadToEndAsync();
                 string error = await process.StandardError.ReadToEndAsync();
                 process.WaitForExit();
@@ -118,7 +118,7 @@ namespace Elsa.Activities.Rpa.Web.Services
             using (var zipArchive = new ZipArchive(zipFileStream, ZipArchiveMode.Read))
             using (var chromeDriverWriter = new FileStream(targetPath, FileMode.Create))
             {
-                var entry = zipArchive.GetEntry(driverName);
+                var entry = zipArchive.GetEntry(driverName)!;
                 using Stream chromeDriverStream = entry.Open();
                 await chromeDriverStream.CopyToAsync(chromeDriverWriter);
             }
@@ -136,7 +136,7 @@ namespace Elsa.Activities.Rpa.Web.Services
                         RedirectStandardOutput = true,
                         RedirectStandardError = true,
                     }
-                );
+                )!;
                 string error = await process.StandardError.ReadToEndAsync();
                 process.WaitForExit();
                 process.Kill();
@@ -152,7 +152,7 @@ namespace Elsa.Activities.Rpa.Web.Services
         {
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
             {
-                string chromePath = (string)Registry.GetValue("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe", null, null);
+                var chromePath = (string?)Registry.GetValue("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\chrome.exe", null, null);
                 if (chromePath == null)
                 {
                     throw new Exception("Google Chrome not found in registry");
@@ -175,7 +175,7 @@ namespace Elsa.Activities.Rpa.Web.Services
                             RedirectStandardOutput = true,
                             RedirectStandardError = true,
                         }
-                    );
+                    )!;
                     string output = await process.StandardOutput.ReadToEndAsync();
                     string error = await process.StandardError.ReadToEndAsync();
                     process.WaitForExit();
@@ -207,7 +207,7 @@ namespace Elsa.Activities.Rpa.Web.Services
                             RedirectStandardOutput = true,
                             RedirectStandardError = true,
                         }
-                    );
+                    )!;
                     string output = await process.StandardOutput.ReadToEndAsync();
                     string error = await process.StandardError.ReadToEndAsync();
                     process.WaitForExit();
diff --git a/src/core/Elsa.Abstractions/Services/Models/ActivityBlueprint.cs b/src/core/Elsa.Abstractions/Services/Models/ActivityBlueprint.cs
index 1195dadbc..b747bac8c 100644
--- a/src/core/Elsa.Abstractions/Services/Models/ActivityBlueprint.cs
+++ b/src/core/Elsa.Abstractions/Services/Models/ActivityBlueprint.cs
@@ -45,7 +45,6 @@ namespace Elsa.Services.Models
         public bool SaveWorkflowContext { get; set; }
         public IDictionary<string, string> PropertyStorageProviders { get; set; } = new Dictionary<string, string>();
         public string? Source { get; set; }
-        public string Key { get; set; }
         public override string ToString() => Type;
     }
 }
\ No newline at end of file
diff --git a/src/samples/persistence/Elsa.Samples.Persistence.YesSql/Elsa.Samples.Persistence.YesSql.csproj b/src/samples/persistence/Elsa.Samples.Persistence.YesSql/Elsa.Samples.Persistence.YesSql.csproj
index 301e79743..71b66a2cb 100644
--- a/src/samples/persistence/Elsa.Samples.Persistence.YesSql/Elsa.Samples.Persistence.YesSql.csproj
+++ b/src/samples/persistence/Elsa.Samples.Persistence.YesSql/Elsa.Samples.Persistence.YesSql.csproj
@@ -7,8 +7,12 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <ProjectReference Include="..\..\..\core\Elsa\Elsa.csproj" />
-      <ProjectReference Include="..\..\..\persistence\Elsa.Persistence.YesSql\Elsa.Persistence.YesSql.csproj" />
+        <PackageReference Include="System.Text.Encodings.Web" Version="5.0.1"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\..\core\Elsa\Elsa.csproj"/>
+        <ProjectReference Include="..\..\..\persistence\Elsa.Persistence.YesSql\Elsa.Persistence.YesSql.csproj"/>
     </ItemGroup>
 
 </Project>
diff --git a/src/samples/worker/Elsa.Samples.WatchDirectoryWorker/Elsa.Samples.WatchDirectoryWorker.csproj b/src/samples/worker/Elsa.Samples.WatchDirectoryWorker/Elsa.Samples.WatchDirectoryWorker.csproj
index f1891d124..0111f1460 100644
--- a/src/samples/worker/Elsa.Samples.WatchDirectoryWorker/Elsa.Samples.WatchDirectoryWorker.csproj
+++ b/src/samples/worker/Elsa.Samples.WatchDirectoryWorker/Elsa.Samples.WatchDirectoryWorker.csproj
@@ -1,39 +1,40 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
-  </PropertyGroup>
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net5.0</TargetFramework>
+    </PropertyGroup>
 
-  <ItemGroup>
-    <None Remove="appsettings.json" />
-  </ItemGroup>
+    <ItemGroup>
+        <None Remove="appsettings.json"/>
+    </ItemGroup>
 
-  <ItemGroup>
-    <Content Include="appsettings.json">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Content>
-  </ItemGroup>
+    <ItemGroup>
+        <Content Include="appsettings.json">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Content>
+    </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0" />
-  </ItemGroup>
+    <ItemGroup>
+        <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0"/>
+        <PackageReference Include="System.Text.Encodings.Web" Version="5.0.1"/>
+    </ItemGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\..\..\activities\Elsa.Activities.Console\Elsa.Activities.Console.csproj" />
-    <ProjectReference Include="..\..\..\activities\Elsa.Activities.File\Elsa.Activities.File.csproj" />
-    <ProjectReference Include="..\..\..\activities\Elsa.Activities.Temporal.Quartz\Elsa.Activities.Temporal.Quartz.csproj" />
-    <ProjectReference Include="..\..\..\core\Elsa\Elsa.csproj" />
-  </ItemGroup>
+    <ItemGroup>
+        <ProjectReference Include="..\..\..\activities\Elsa.Activities.Console\Elsa.Activities.Console.csproj"/>
+        <ProjectReference Include="..\..\..\activities\Elsa.Activities.File\Elsa.Activities.File.csproj"/>
+        <ProjectReference Include="..\..\..\activities\Elsa.Activities.Temporal.Quartz\Elsa.Activities.Temporal.Quartz.csproj"/>
+        <ProjectReference Include="..\..\..\core\Elsa\Elsa.csproj"/>
+    </ItemGroup>
 
-  <ItemGroup>
-    <Resource Include="appsettings.json" />
-  </ItemGroup>
+    <ItemGroup>
+        <Resource Include="appsettings.json"/>
+    </ItemGroup>
 
-  <ItemGroup>
-    <Compile Update="Program.cs">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </Compile>
-  </ItemGroup>
+    <ItemGroup>
+        <Compile Update="Program.cs">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Compile>
+    </ItemGroup>
 
 </Project>