diff --git a/NaturalSort/NaturalSort.csproj b/NaturalSort/NaturalSort.csproj
index 8083b762..40cefda8 100644
--- a/NaturalSort/NaturalSort.csproj
+++ b/NaturalSort/NaturalSort.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
 </Project>
diff --git a/SabreTools.Core/SabreTools.Core.csproj b/SabreTools.Core/SabreTools.Core.csproj
index e5714078..95d177a5 100644
--- a/SabreTools.Core/SabreTools.Core.csproj
+++ b/SabreTools.Core/SabreTools.Core.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.DatFiles/SabreTools.DatFiles.csproj b/SabreTools.DatFiles/SabreTools.DatFiles.csproj
index 82cf4885..1f8088a7 100644
--- a/SabreTools.DatFiles/SabreTools.DatFiles.csproj
+++ b/SabreTools.DatFiles/SabreTools.DatFiles.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.DatItems/SabreTools.DatItems.csproj b/SabreTools.DatItems/SabreTools.DatItems.csproj
index e110d839..67cd9a60 100644
--- a/SabreTools.DatItems/SabreTools.DatItems.csproj
+++ b/SabreTools.DatItems/SabreTools.DatItems.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.DatTools/SabreTools.DatTools.csproj b/SabreTools.DatTools/SabreTools.DatTools.csproj
index 160fd2a3..17ff84cf 100644
--- a/SabreTools.DatTools/SabreTools.DatTools.csproj
+++ b/SabreTools.DatTools/SabreTools.DatTools.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.FileTypes/SabreTools.FileTypes.csproj b/SabreTools.FileTypes/SabreTools.FileTypes.csproj
index 40ec29b7..612f2167 100644
--- a/SabreTools.FileTypes/SabreTools.FileTypes.csproj
+++ b/SabreTools.FileTypes/SabreTools.FileTypes.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Filter/SabreTools.Filter.csproj b/SabreTools.Filter/SabreTools.Filter.csproj
index 63f04bd7..05032732 100644
--- a/SabreTools.Filter/SabreTools.Filter.csproj
+++ b/SabreTools.Filter/SabreTools.Filter.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Filtering/SabreTools.Filtering.csproj b/SabreTools.Filtering/SabreTools.Filtering.csproj
index e6d3fafe..ba3b2a89 100644
--- a/SabreTools.Filtering/SabreTools.Filtering.csproj
+++ b/SabreTools.Filtering/SabreTools.Filtering.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Help/SabreTools.Help.csproj b/SabreTools.Help/SabreTools.Help.csproj
index 567b2f0a..c4102ee3 100644
--- a/SabreTools.Help/SabreTools.Help.csproj
+++ b/SabreTools.Help/SabreTools.Help.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Logging/SabreTools.Logging.csproj b/SabreTools.Logging/SabreTools.Logging.csproj
index 6e10df1b..450213f8 100644
--- a/SabreTools.Logging/SabreTools.Logging.csproj
+++ b/SabreTools.Logging/SabreTools.Logging.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Reports/SabreTools.Reports.csproj b/SabreTools.Reports/SabreTools.Reports.csproj
index 5083995b..3915543f 100644
--- a/SabreTools.Reports/SabreTools.Reports.csproj
+++ b/SabreTools.Reports/SabreTools.Reports.csproj
@@ -2,6 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/SabreTools.Skippers/SabreTools.Skippers.csproj b/SabreTools.Skippers/SabreTools.Skippers.csproj
index 0320c8af..40f028b0 100644
--- a/SabreTools.Skippers/SabreTools.Skippers.csproj
+++ b/SabreTools.Skippers/SabreTools.Skippers.csproj
@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>