diff --git a/kernel-builder/Cargo.lock b/kernel-builder/Cargo.lock
index ec5dbd91..16efb5e0 100644
--- a/kernel-builder/Cargo.lock
+++ b/kernel-builder/Cargo.lock
@@ -245,6 +245,7 @@ dependencies = [
  "serde_json",
  "thiserror",
  "toml",
+ "url",
 ]
 
 [[package]]
@@ -810,6 +811,7 @@ dependencies = [
  "form_urlencoded",
  "idna",
  "percent-encoding",
+ "serde",
 ]
 
 [[package]]
diff --git a/kernel-builder/Cargo.toml b/kernel-builder/Cargo.toml
index 8df3bab0..c5e01406 100644
--- a/kernel-builder/Cargo.toml
+++ b/kernel-builder/Cargo.toml
@@ -23,6 +23,7 @@ serde_json = "1"
 serde-value = "0.7"
 thiserror = "1"
 toml = "0.8"
+url = { version = "2", features = ["serde"] }
 
 [build-dependencies]
 minijinja-embed = "2.5"
diff --git a/kernel-builder/src/config/compat.rs b/kernel-builder/src/config/compat.rs
index c8553a4a..78d13d96 100644
--- a/kernel-builder/src/config/compat.rs
+++ b/kernel-builder/src/config/compat.rs
@@ -5,6 +5,7 @@ use serde_value::Value;
 use super::{v1, v2, v3, Build};
 
 #[derive(Debug)]
+#[allow(clippy::large_enum_variant)]
 pub enum BuildCompat {
     V1(v1::Build),
     V2(v2::Build),
diff --git a/kernel-builder/src/config/mod.rs b/kernel-builder/src/config/mod.rs
index 8f632989..dbd3ff78 100644
--- a/kernel-builder/src/config/mod.rs
+++ b/kernel-builder/src/config/mod.rs
@@ -61,6 +61,9 @@ pub struct General {
     /// Hugging Face Hub license identifier.
     pub license: Option<String>,
 
+    /// Source repository or reference for the kernel code.
+    pub upstream: Option<url::Url>,
+
     pub backends: Vec<Backend>,
     pub hub: Option<Hub>,
     pub python_depends: Option<Vec<String>>,
diff --git a/kernel-builder/src/config/v1.rs b/kernel-builder/src/config/v1.rs
index c4f523bb..01c969f1 100644
--- a/kernel-builder/src/config/v1.rs
+++ b/kernel-builder/src/config/v1.rs
@@ -106,6 +106,7 @@ impl TryFrom<Build> for super::Build {
                 name: build.general.name,
                 version: None,
                 license: None,
+                upstream: None,
                 backends,
                 hub: None,
                 neuron: None,
diff --git a/kernel-builder/src/config/v2.rs b/kernel-builder/src/config/v2.rs
index 7c94eac0..7a6f7384 100644
--- a/kernel-builder/src/config/v2.rs
+++ b/kernel-builder/src/config/v2.rs
@@ -171,6 +171,7 @@ impl General {
             name: general.name,
             version: None,
             license: None,
+            upstream: None,
             backends,
             cuda,
             hub: general.hub.map(Into::into),
diff --git a/kernel-builder/src/config/v3.rs b/kernel-builder/src/config/v3.rs
index 625d8102..a74cd7ee 100644
--- a/kernel-builder/src/config/v3.rs
+++ b/kernel-builder/src/config/v3.rs
@@ -38,6 +38,8 @@ pub struct General {
 
     pub license: Option<String>,
 
+    pub upstream: Option<url::Url>,
+
     pub backends: Vec<Backend>,
 
     pub cuda: Option<CudaGeneral>,
@@ -183,6 +185,7 @@ impl From<General> for super::General {
             name: general.name,
             version: general.version,
             license: general.license,
+            upstream: general.upstream,
             backends: general.backends.into_iter().map(Into::into).collect(),
             cuda: general.cuda.map(Into::into),
             hub: general.hub.map(Into::into),
@@ -363,6 +366,7 @@ impl From<super::General> for General {
             name: general.name,
             version: general.version,
             license: general.license,
+            upstream: general.upstream,
             backends: general.backends.into_iter().map(Into::into).collect(),
             cuda: general.cuda.map(Into::into),
             hub: general.hub.map(Into::into),
diff --git a/kernel-builder/src/pyproject/common.rs b/kernel-builder/src/pyproject/common.rs
index d16cd2d4..af398c3c 100644
--- a/kernel-builder/src/pyproject/common.rs
+++ b/kernel-builder/src/pyproject/common.rs
@@ -34,6 +34,7 @@ pub fn write_metadata(general: &General, file_set: &mut FileSet) -> Result<()> {
         let metadata = Metadata {
             version: general.version,
             license: general.license.clone(),
+            upstream: general.upstream.clone(),
             python_depends,
         };
 
diff --git a/kernel-builder/src/pyproject/metadata.rs b/kernel-builder/src/pyproject/metadata.rs
index c8635d90..d40d0f58 100644
--- a/kernel-builder/src/pyproject/metadata.rs
+++ b/kernel-builder/src/pyproject/metadata.rs
@@ -7,5 +7,7 @@ pub struct Metadata {
     pub version: Option<usize>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub license: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub upstream: Option<url::Url>,
     pub python_depends: Vec<String>,
 }
diff --git a/template/build.toml b/template/build.toml
index 09db8326..caf4548f 100644
--- a/template/build.toml
+++ b/template/build.toml
@@ -8,6 +8,7 @@ backends = [
 ]
 name = "__KERNEL_NAME__"
 version = 1
+upstream = "__UPSTREAM_URL__"
 
 [torch]
 src = [