diff --git a/CHANGELOG.md b/CHANGELOG.md
index d63c31a..687380a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Correct `pesde.toml` inclusion message in `publish` command by @daimond113
 - Allow writes to files when `link` is false in PackageFS::write_to by @daimond113
 - Handle missing revisions in AnyPackageIdentifier::from_str by @daimond113
+- Make GitHub OAuth client ID config optional by @daimond113
 
 ## [0.5.0-rc.5] - 2024-10-12
 ### Added
diff --git a/src/cli/commands/auth/login.rs b/src/cli/commands/auth/login.rs
index b451777..c430e1d 100644
--- a/src/cli/commands/auth/login.rs
+++ b/src/cli/commands/auth/login.rs
@@ -95,7 +95,9 @@ impl LoginCommand {
         let config = source
             .config(project)
             .context("failed to read index config")?;
-        let client_id = config.github_oauth_client_id;
+        let Some(client_id) = config.github_oauth_client_id else {
+            anyhow::bail!("index not configured for Github oauth.");
+        };
 
         let response = reqwest
             .post(Url::parse_with_params(
diff --git a/src/source/pesde/mod.rs b/src/source/pesde/mod.rs
index 3dac8e0..c281dbb 100644
--- a/src/source/pesde/mod.rs
+++ b/src/source/pesde/mod.rs
@@ -364,7 +364,8 @@ pub struct IndexConfig {
     #[serde(default)]
     pub wally_allowed: bool,
     /// The OAuth client ID for GitHub
-    pub github_oauth_client_id: String,
+    #[serde(default)]
+    pub github_oauth_client_id: Option<String>,
     /// The maximum size of an archive in bytes
     #[serde(default = "default_archive_size")]
     pub max_archive_size: usize,