diff --git a/src/repository.rs b/src/repository.rs
index 8e26bd9..8624530 100644
--- a/src/repository.rs
+++ b/src/repository.rs
@@ -352,12 +352,12 @@ pub struct PullRequest {
     pub is_locked: bool,
     pub labels: Vec<Label>,
     pub merge_base: String,
-    pub merge_commit_sha: String,
+    pub merge_commit_sha: Option<String>,
     pub mergeable: bool,
     pub merged: bool,
     #[serde(with = "time::serde::rfc3339::option")]
     pub merged_at: Option<time::OffsetDateTime>,
-    pub merged_by: User,
+    pub merged_by: Option<User>,
     pub milestone: Option<Milestone>,
     pub number: u64,
     pub patch_url: Url,