diff --git a/.github/workflows/rust-release.yml b/.github/workflows/rust-release.yml
index 5d6d3f7ca..b88c1f264 100644
--- a/.github/workflows/rust-release.yml
+++ b/.github/workflows/rust-release.yml
@@ -57,7 +57,9 @@ jobs:
       run:
         working-directory: codex-rs
     env:
-      CARGO_PROFILE_RELEASE_LTO: ${{ contains(github.ref_name, '-alpha') && 'thin' || 'fat' }}
+      # 2026-03-04: temporarily change releases to use thin LTO because
+      # Ubuntu ARM is timing out at 60 minutes.
+      CARGO_PROFILE_RELEASE_LTO: ${{ contains(github.ref_name, '-alpha') && 'thin' || 'thin' }}
 
     strategy:
       fail-fast: false
@@ -211,6 +213,7 @@ jobs:
       - name: Cargo build
         shell: bash
         run: |
+          echo "CARGO_PROFILE_RELEASE_LTO: ${CARGO_PROFILE_RELEASE_LTO}"
           cargo build --target ${{ matrix.target }} --release --timings --bin codex --bin codex-responses-api-proxy
 
       - name: Upload Cargo timings