diff --git a/Applications/ConsoleReferenceClient/ConsoleReferenceClient.csproj b/Applications/ConsoleReferenceClient/ConsoleReferenceClient.csproj
index 8b9d99348..818599906 100644
--- a/Applications/ConsoleReferenceClient/ConsoleReferenceClient.csproj
+++ b/Applications/ConsoleReferenceClient/ConsoleReferenceClient.csproj
@@ -24,7 +24,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="8.0.0" />
     <PackageReference Include="Mono.Options" Version="6.12.0.148" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Serilog.Expressions" Version="4.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="5.0.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="3.1.0" />
diff --git a/Applications/ConsoleReferenceServer/ConsoleReferenceServer.csproj b/Applications/ConsoleReferenceServer/ConsoleReferenceServer.csproj
index 28c81fb76..e12e841d5 100644
--- a/Applications/ConsoleReferenceServer/ConsoleReferenceServer.csproj
+++ b/Applications/ConsoleReferenceServer/ConsoleReferenceServer.csproj
@@ -33,7 +33,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="8.0.0" />
     <PackageReference Include="Mono.Options" Version="6.12.0.148" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Serilog.Expressions" Version="4.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="5.0.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="3.1.0" />
diff --git a/Applications/ReferenceServer/Reference Server.csproj b/Applications/ReferenceServer/Reference Server.csproj
index d3773e6f2..7a9acf87c 100644
--- a/Applications/ReferenceServer/Reference Server.csproj	
+++ b/Applications/ReferenceServer/Reference Server.csproj	
@@ -159,7 +159,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Serilog">
-      <Version>3.1.1</Version>
+      <Version>4.0.0</Version>
     </PackageReference>
     <PackageReference Include="Serilog.Sinks.Debug">
       <Version>2.0.0</Version>
diff --git a/Fuzzing/Encoders/Fuzz.Tools/Encoders.Fuzz.Tools.csproj b/Fuzzing/Encoders/Fuzz.Tools/Encoders.Fuzz.Tools.csproj
index 258bf0027..718ddeb86 100644
--- a/Fuzzing/Encoders/Fuzz.Tools/Encoders.Fuzz.Tools.csproj
+++ b/Fuzzing/Encoders/Fuzz.Tools/Encoders.Fuzz.Tools.csproj
@@ -22,7 +22,7 @@
     <PackageReference Include="SharpFuzz" Version="2.1.1" />
     <PackageReference Include="Mono.Options" Version="6.12.0.148" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Serilog.Expressions" Version="4.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="5.0.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="3.1.0" />