diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index dae00b1..7ef61cc 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -31,8 +31,10 @@ jobs:
       - name: Build
         run: ./gradlew build --no-daemon
 
+      # v4 uses @actions/artifact v2, which refuses to run against Gitea's
+      # self-hosted Actions (it reports itself as GHES, which v2 blocks).
       - name: Upload plugin jar
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: BoatParty
           path: build/libs/BoatParty-*.jar