diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6b5e2bfaa7..76fe6354f0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,6 +9,8 @@ on:
 
   pull_request:
 
+  workflow_dispatch:
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
diff --git a/.github/workflows/rust-toolchain-update.yml b/.github/workflows/rust-toolchain-update.yml
index 2478f351a5..60fa763309 100644
--- a/.github/workflows/rust-toolchain-update.yml
+++ b/.github/workflows/rust-toolchain-update.yml
@@ -4,6 +4,7 @@ on:
   schedule:
     # Run weekly on Mondays at 00:00 UTC
     - cron: '0 0 * * 1'
+  pull_request:
 
 jobs:
   check-and-update:
@@ -13,6 +14,7 @@ jobs:
     permissions:
       contents: write
       pull-requests: write
+      actions: write
 
     steps:
       - name: Checkout Repository
@@ -106,7 +108,7 @@ jobs:
               repo: context.repo.repo,
               title: commitTitle,
               head: branchName,
-              base: '${{ github.ref_name }}',
+              base: '${{ github.head_ref }}',
               body: `Update Rust toolchain to ${newVersion} (${fullVersion}).
 
               **Changes:**
@@ -127,3 +129,12 @@ jobs:
             });
 
             console.log(`Created PR #${pr.number}: ${pr.title}`);
+
+            // Run the CI workflow on the PR branch. Needed because GITHUB_TOKEN
+            // doesn't trigger workflows, except for workflow_dispatch.
+            await github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: 'ci.yml',
+              ref: branchName,
+            });
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 6697c67365..78ad751080 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
 # We pin the minor version to prevent new Clippy lints from breaking CI.
 # But, we still want to pick up new patch versions.
-channel = "1.89"
+channel = "1.88"