diff --git a/Contentless/Contentless.csproj b/Contentless/Contentless.csproj
index 22d2444..f62981a 100644
--- a/Contentless/Contentless.csproj
+++ b/Contentless/Contentless.csproj
@@ -11,10 +11,10 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="MonoGame.Framework.Content.Pipeline" Version="3.8.0.1641">
+        <PackageReference Include="MonoGame.Framework.Content.Pipeline" Version="3.8.1.303">
             <PrivateAssets>All</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.0.1641">
+        <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.1.303">
             <PrivateAssets>All</PrivateAssets>
         </PackageReference>
         <PackageReference Include="Newtonsoft.Json" Version="13.0.1">
diff --git a/Contentless/Contentless.nuspec b/Contentless/Contentless.nuspec
index a218f7c..ac550a3 100644
--- a/Contentless/Contentless.nuspec
+++ b/Contentless/Contentless.nuspec
@@ -10,7 +10,7 @@
         <repository type="git" url="https://github.com/Ellpeck/Contentless" />
         <readme>README.md</readme>
         <icon>Logo.png</icon>
-        <version>3.0.7</version>
+        <version>3.1.2</version>
         <dependencies>
             <group targetFramework="net8.0" />
         </dependencies>
diff --git a/Contentless/Program.cs b/Contentless/Program.cs
index d560dd1..c548c18 100644
--- a/Contentless/Program.cs
+++ b/Contentless/Program.cs
@@ -13,16 +13,16 @@ namespace Contentless;
 
 public static class Program {
 
-    public static void Main(string[] args) {
+    public static int Main(string[] args) {
         if (args.Length < 1) {
             Console.Error.WriteLine("Please specify the location of the content file you want to use");
-            return;
+            return 1;
         }
 
         var contentFile = new FileInfo(Path.GetFullPath(Path.Combine(Environment.CurrentDirectory, args[0])));
-        if (!contentFile.Exists) {
-            Console.Error.WriteLine($"Unable to find content file {contentFile}");
-            return;
+        if (!contentFile.Exists || contentFile.Extension != ".mgcb") {
+            Console.Error.WriteLine($"Unable to find valid content file at {contentFile}");
+            return 1;
         }
 
         Console.WriteLine($"Using content file {contentFile}");
@@ -38,6 +38,7 @@ public static class Program {
                 Console.WriteLine($"Using config from {configFile}");
             } catch (Exception e) {
                 Console.Error.WriteLine($"Error loading config from {configFile}: {e}");
+                return 1;
             }
         } else {
             Console.WriteLine("Using default config");
@@ -50,6 +51,10 @@ public static class Program {
         if (config.References.Length > 0) {
             if (args.Length > 1) {
                 var csprojFullPath = Path.GetFullPath(Path.Combine(Environment.CurrentDirectory, args[1]));
+                if (!File.Exists(csprojFullPath) || Path.GetExtension(csprojFullPath) != ".csproj") {
+                    Console.Error.WriteLine($"Unable to find valid project file at {contentFile}");
+                    return 1;
+                }
                 Program.ExtractVersions(csprojFullPath, referencesVersions);
                 var settings = Settings.LoadDefaultSettings(Path.GetDirectoryName(csprojFullPath));
                 packagesFolder = SettingsUtility.GetGlobalPackagesFolder(settings);
@@ -196,6 +201,7 @@ public static class Program {
             Console.WriteLine("Wrote changes to content file");
         }
         Console.Write("Done");
+        return 0;
     }
 
     private static void SafeAssemblyLoad(string refPath) {
diff --git a/Test/Content/Content.mgcb b/Test/Content/Content.mgcb
index 39aade8..33470f6 100644
--- a/Test/Content/Content.mgcb
+++ b/Test/Content/Content.mgcb
@@ -10,7 +10,7 @@
 
 #-------------------------------- References --------------------------------#
 
-/reference:C:/Users/me/.nuget/packages/monogame.extended.content.pipeline/3.8.0/tools/MonoGame.Extended.Content.Pipeline.dll
+/reference:C:/Users/me/.nuget/packages/monogame.extended.content.pipeline/3.9.0-alpha0093/tools/MonoGame.Extended.Content.Pipeline.dll
 
 #---------------------------------- Content ---------------------------------#
 
@@ -42,12 +42,6 @@
 /processor:TiledMapProcessor
 /build:Tiled/Map.tmx
 
-#begin Tiled/Tiles.png
-/importer:TextureImporter
-/processor:TextureProcessor
-/processorParam:TextureFormat=NoChange
-/build:Tiled/Tiles.png
-
 #begin Tiled/Tileset.tsx
 /importer:TiledMapTilesetImporter
 /processor:TiledMapTilesetProcessor
diff --git a/Test/Content/Contentless.json b/Test/Content/Contentless.json
index ab32b6c..cc5e038 100644
--- a/Test/Content/Contentless.json
+++ b/Test/Content/Contentless.json
@@ -2,7 +2,8 @@
     "exclude": [
         "obj/",
         "bin/",
-        "Ex*.png"
+        "Ex*.png",
+        "Tiled/*.png"
     ],
     "logSkipped": true,
     "references": ["MonoGame.Extended.Content.Pipeline"],
diff --git a/Test/Test.csproj b/Test/Test.csproj
index 6e4e78a..eb33c17 100644
--- a/Test/Test.csproj
+++ b/Test/Test.csproj
@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="MonoGame.Extended.Content.Pipeline" Version="3.8.0" />
+        <PackageReference Include="MonoGame.Extended.Content.Pipeline" Version="3.9.0-alpha0093" />
         <PackageReference Include="MonoGame.Content.Builder.Task" Version="3.8.1.303" />
     </ItemGroup>