diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0f5f43da..42cb6843 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,7 +4,7 @@ on:
   push:
 jobs:
   tests:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
       with:
diff --git a/src/sql/upgrade-83.sql b/src/sql/upgrade-83.sql
new file mode 100644
index 00000000..01603e78
--- /dev/null
+++ b/src/sql/upgrade-83.sql
@@ -0,0 +1,3 @@
+-- This index was introduced in a migration but was never recorded in
+-- hydra.sql (the source of truth), which is why `if exists` is required.
+drop index if exists IndexBuildOutputsOnPath;