diff --git a/src/Experiment/Experiment.csproj b/src/Experiment/Experiment.csproj
index 8aa18db5..3a9b8e8d 100644
--- a/src/Experiment/Experiment.csproj
+++ b/src/Experiment/Experiment.csproj
@@ -13,7 +13,7 @@
     <PackageReference Include="MediatR" Version="11.1.0" />
     <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="11.1.0" />
     <PackageReference Include="Scrutor" Version="4.2.2" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="8.0.1" />
     <PackageReference Include="Serilog.Exceptions" Version="8.4.0+build.694" />
     <PackageReference Include="Serilog.Formatting.Compact.Reader" Version="2.0.0" />
diff --git a/tests/BaseTestCode/BaseTestCode.csproj b/tests/BaseTestCode/BaseTestCode.csproj
index 017314a7..2ef99527 100644
--- a/tests/BaseTestCode/BaseTestCode.csproj
+++ b/tests/BaseTestCode/BaseTestCode.csproj
@@ -25,7 +25,7 @@
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="NSubstitute" Version="5.1.0" />
-    <PackageReference Include="Serilog" Version="3.1.1" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Serilog.AspNetCore" Version="8.0.1" />
     <PackageReference Include="Serilog.Sinks.XUnit" Version="3.0.5" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556">