diff --git a/src/UglyToad.PdfPig.Core/UglyToad.PdfPig.Core.csproj b/src/UglyToad.PdfPig.Core/UglyToad.PdfPig.Core.csproj
index a2c9fd88..e3772389 100644
--- a/src/UglyToad.PdfPig.Core/UglyToad.PdfPig.Core.csproj
+++ b/src/UglyToad.PdfPig.Core/UglyToad.PdfPig.Core.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/src/UglyToad.PdfPig.DocumentLayoutAnalysis/UglyToad.PdfPig.DocumentLayoutAnalysis.csproj b/src/UglyToad.PdfPig.DocumentLayoutAnalysis/UglyToad.PdfPig.DocumentLayoutAnalysis.csproj
index bc2a1e90..3d409c91 100644
--- a/src/UglyToad.PdfPig.DocumentLayoutAnalysis/UglyToad.PdfPig.DocumentLayoutAnalysis.csproj
+++ b/src/UglyToad.PdfPig.DocumentLayoutAnalysis/UglyToad.PdfPig.DocumentLayoutAnalysis.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/src/UglyToad.PdfPig.Fonts/UglyToad.PdfPig.Fonts.csproj b/src/UglyToad.PdfPig.Fonts/UglyToad.PdfPig.Fonts.csproj
index d8d5fc1f..3aabec29 100644
--- a/src/UglyToad.PdfPig.Fonts/UglyToad.PdfPig.Fonts.csproj
+++ b/src/UglyToad.PdfPig.Fonts/UglyToad.PdfPig.Fonts.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/src/UglyToad.PdfPig.Tokenization/UglyToad.PdfPig.Tokenization.csproj b/src/UglyToad.PdfPig.Tokenization/UglyToad.PdfPig.Tokenization.csproj
index 668287a4..a0916358 100644
--- a/src/UglyToad.PdfPig.Tokenization/UglyToad.PdfPig.Tokenization.csproj
+++ b/src/UglyToad.PdfPig.Tokenization/UglyToad.PdfPig.Tokenization.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/src/UglyToad.PdfPig.Tokens/UglyToad.PdfPig.Tokens.csproj b/src/UglyToad.PdfPig.Tokens/UglyToad.PdfPig.Tokens.csproj
index d4fe9bda..a7cfc826 100644
--- a/src/UglyToad.PdfPig.Tokens/UglyToad.PdfPig.Tokens.csproj
+++ b/src/UglyToad.PdfPig.Tokens/UglyToad.PdfPig.Tokens.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/src/UglyToad.PdfPig/UglyToad.PdfPig.csproj b/src/UglyToad.PdfPig/UglyToad.PdfPig.csproj
index b6cf462b..049fd90e 100644
--- a/src/UglyToad.PdfPig/UglyToad.PdfPig.csproj
+++ b/src/UglyToad.PdfPig/UglyToad.PdfPig.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net462;net47;net6.0;net8.0</TargetFrameworks>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>12</LangVersion>
     <Version>0.1.9-alpha001</Version>
     <IsTestProject>False</IsTestProject>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>