diff --git a/.github/workflows/rust-release-prepare.yml b/.github/workflows/rust-release-prepare.yml
index 6dec109b8..94e0f59c8 100644
--- a/.github/workflows/rust-release-prepare.yml
+++ b/.github/workflows/rust-release-prepare.yml
@@ -21,8 +21,6 @@ jobs:
           ref: main
           fetch-depth: 0
 
-      - uses: dtolnay/rust-toolchain@1.90
-
       - name: Update models.json
         env:
           OPENAI_API_KEY: ${{ secrets.CODEX_OPENAI_API_KEY }}
@@ -30,14 +28,17 @@ jobs:
           set -euo pipefail
 
           client_version="99.99.99"
+          terminal_info="github-actions"
+          user_agent="codex_cli_rs/99.99.99 (Linux $(uname -r); $(uname -m)) ${terminal_info}"
           base_url="${OPENAI_BASE_URL:-https://chatgpt.com/backend-api/codex}"
 
           headers=(
             -H "Authorization: Bearer ${OPENAI_API_KEY}"
+            -H "User-Agent: ${user_agent}"
           )
 
           url="${base_url%/}/models?client_version=${client_version}"
-          curl --fail --show-error --location "${headers[@]}" "${url}" | jq '.' > codex-rs/core/models.json
+          curl --http1.1 --fail --show-error --location "${headers[@]}" "${url}" | jq '.' > codex-rs/core/models.json
 
       - name: Open pull request (if changed)
         uses: peter-evans/create-pull-request@v7