diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e49a22ea42..78d520bc11 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -126,7 +126,10 @@ jobs:
   gates:
     name: Repository gates
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    # The rustfmt build's crate_universe splice clones git-pinned crates from
+    # scratch. asupersync's full history alone took over 7 minutes on a hosted
+    # runner, so 15 minutes no longer fits.
+    timeout-minutes: 30
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with: