diff --git a/.github/workflows/on-pull-request.yaml b/.github/workflows/on-pull-request.yaml
index 2e64c8f9f..826918a6d 100755
--- a/.github/workflows/on-pull-request.yaml
+++ b/.github/workflows/on-pull-request.yaml
@@ -15,6 +15,9 @@ permissions:
 
 jobs:
   update-citations:
+    # skip fork PRs: checking out fork code under pull_request_target is unsafe
+    # (citations are updated by on-push after merge instead)
+    if: github.event.pull_request.head.repo.full_name == github.repository
     uses: ./.github/workflows/update-citations.yaml
 
   # build-preview:
diff --git a/.gitignore b/.gitignore
index d944721de..c7046ef65 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 _site/
 Gemfile.lock
+*:Zone.Identifier
diff --git a/_data/past_staff.yaml b/_data/past_staff.yaml
index cc6be93a4..253c5a7b5 100644
--- a/_data/past_staff.yaml
+++ b/_data/past_staff.yaml
@@ -46,7 +46,7 @@
   term: "2025"
   term_end_year: 2025
   affiliation: "Japan Advanced Institute of Science and Technology, Project Assistant Professor"
-  affiliation_jp: "北陸先端科学技術大学院大学　特任助教"
+  affiliation_jp: "北陸先端科学技術大学院大学 特任助教"
 
 # 短期留学生
 - name: Seongoh Lee
diff --git a/images/projects/hri/robotic-art/mosaicart.png:Zone.Identifier b/images/projects/hri/robotic-art/mosaicart.png:Zone.Identifier
deleted file mode 100644
index d6c1ec682..000000000
Binary files a/images/projects/hri/robotic-art/mosaicart.png:Zone.Identifier and /dev/null differ