diff --git a/Ocaramba.Tests.NUnit/Ocaramba.Tests.NUnit.csproj b/Ocaramba.Tests.NUnit/Ocaramba.Tests.NUnit.csproj
index bf5141cf1..6c9121952 100644
--- a/Ocaramba.Tests.NUnit/Ocaramba.Tests.NUnit.csproj
+++ b/Ocaramba.Tests.NUnit/Ocaramba.Tests.NUnit.csproj
@@ -8,7 +8,7 @@
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
     <PackageReference Include="Microsoft.TestPlatform.TestHost" Version="17.1.0" />
     <PackageReference Include="NLog" Version="4.7.14" />
-    <PackageReference Include="NPOI" Version="2.5.5" />
+    <PackageReference Include="NPOI" Version="2.5.6" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Runners" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.1">
diff --git a/Ocaramba.Tests.NUnitExtentReports/Ocaramba.Tests.NUnitExtentReports.csproj b/Ocaramba.Tests.NUnitExtentReports/Ocaramba.Tests.NUnitExtentReports.csproj
index d29565d55..678bc3601 100644
--- a/Ocaramba.Tests.NUnitExtentReports/Ocaramba.Tests.NUnitExtentReports.csproj
+++ b/Ocaramba.Tests.NUnitExtentReports/Ocaramba.Tests.NUnitExtentReports.csproj
@@ -8,7 +8,7 @@
     <PackageReference Include="Appveyor.TestLogger" Version="2.0.0" />
     <PackageReference Include="Microsoft.TestPlatform.TestHost" Version="17.1.0" />
     <PackageReference Include="NLog" Version="4.7.14" />
-    <PackageReference Include="NPOI" Version="2.5.5" />
+    <PackageReference Include="NPOI" Version="2.5.6" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit.Runners" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.1">