diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index ce587d05d..28cfe86ec 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -48,6 +48,11 @@ jobs:
         ref: upm
         path: upm
 
+    - name: Build package.json
+      run: |
+        dotnet run --project ./X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj "./X10D/bin/Debug/netstandard2.1/X10D.dll"
+        cp package.json upm/package.json
+
     - name: Commit update
       run: |
         cd upm
@@ -61,5 +66,6 @@ jobs:
         git add X10D.Unity.dll
         git add X10D.xml
         git add X10D.Unity.xml
+        git add package.json
         git commit -m "Update upm branch ($GITHUB_SHA)"
         git push
diff --git a/.github/workflows/prerelease.yml b/.github/workflows/prerelease.yml
index 8edc4462f..9642fcddf 100644
--- a/.github/workflows/prerelease.yml
+++ b/.github/workflows/prerelease.yml
@@ -54,6 +54,11 @@ jobs:
         ref: upm
         path: upm
 
+    - name: Build package.json
+      run: |
+        dotnet run --project ./X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj "./X10D/bin/Release/netstandard2.1/X10D.dll"
+        cp package.json upm/package.json
+
     - name: Commit update
       run: |
         cd upm
@@ -67,5 +72,6 @@ jobs:
         git add X10D.Unity.dll
         git add X10D.xml
         git add X10D.Unity.xml
+        git add package.json
         git commit -m "Update upm branch ($GITHUB_SHA)"
         git push
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f91543ea8..1064f6f7e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -54,6 +54,11 @@ jobs:
         ref: upm
         path: upm
 
+    - name: Build package.json
+      run: |
+        dotnet run --project ./X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj "./X10D/bin/Release/netstandard2.1/X10D.dll"
+        cp package.json upm/package.json
+
     - name: Commit update
       run: |
         cd upm
@@ -67,5 +72,6 @@ jobs:
         git add X10D.Unity.dll
         git add X10D.xml
         git add X10D.Unity.xml
+        git add package.json
         git commit -m "Update upm branch ($GITHUB_SHA)"
         git push
diff --git a/X10D.UpmPackageGenerator/Program.cs b/X10D.UpmPackageGenerator/Program.cs
new file mode 100644
index 000000000..b57e095a7
--- /dev/null
+++ b/X10D.UpmPackageGenerator/Program.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Text.Json;
+
+string version;
+
+if (args.Length == 0 || string.IsNullOrWhiteSpace(args[0]))
+{
+    version = Environment.GetEnvironmentVariable("GITHUB_SHA") ?? "0.0.0";
+}
+
+string path = args[0];
+var assembly = Assembly.LoadFrom(path);
+var attribute = assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+if (attribute is null || string.IsNullOrWhiteSpace(attribute.InformationalVersion))
+{
+    version = Environment.GetEnvironmentVariable("GITHUB_SHA") ?? "0.0.0";
+}
+else
+{
+    version = attribute.InformationalVersion;
+}
+
+var package = new
+{
+    name = "me.olivr.x10d",
+    author = new {name = "Oliver Booth", email = "me@olivr.me", url = "https://oliverbooth.dev"},
+    displayName = "X10D",
+    version,
+    unity = "2021.3",
+    description = "Extension methods on crack",
+    keywords = new[] {"dotnet", "extension-methods"},
+    changelogUrl = "https://github.com/oliverbooth/X10D/blob/main/CHANGELOG.md",
+    licensesUrl = "https://github.com/oliverbooth/X10D/blob/main/LICENSE.md"
+};
+
+Console.WriteLine(JsonSerializer.Serialize(package, new JsonSerializerOptions {WriteIndented = true}));
diff --git a/X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj b/X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj
new file mode 100644
index 000000000..2b14c8172
--- /dev/null
+++ b/X10D.UpmPackageGenerator/X10D.UpmPackageGenerator.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
diff --git a/X10D.sln b/X10D.sln
index 7498472c7..25a2e3e0a 100644
--- a/X10D.sln
+++ b/X10D.sln
@@ -41,6 +41,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Workflows", "Workflows", "{
 		.github\workflows\unity.yml = .github\workflows\unity.yml
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "X10D.UpmPackageGenerator", "X10D.UpmPackageGenerator\X10D.UpmPackageGenerator.csproj", "{CCBF047D-1B01-45EC-8D89-B00B4AC482CA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -75,6 +77,10 @@ Global
 		{B04AF429-30CF-4B69-81BA-38F560CA9126}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B04AF429-30CF-4B69-81BA-38F560CA9126}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B04AF429-30CF-4B69-81BA-38F560CA9126}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CCBF047D-1B01-45EC-8D89-B00B4AC482CA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CCBF047D-1B01-45EC-8D89-B00B4AC482CA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CCBF047D-1B01-45EC-8D89-B00B4AC482CA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CCBF047D-1B01-45EC-8D89-B00B4AC482CA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -82,4 +88,6 @@ Global
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {6F733785-8837-410C-BD91-C4AD1F0A6914}
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+	EndGlobalSection
 EndGlobal