diff --git a/Dockerfile b/Dockerfile
index 3782932..913fb33 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,13 +13,13 @@ RUN apk add --no-cache --no-check-certificate bash ca-certificates curl git jq u
 
 # 安裝 Codex CLI 工具
 RUN install_script="$(mktemp)" \
+    && trap 'rm -f "$install_script"' EXIT \
     && curl -fsSL --retry 3 --retry-delay 2 --max-time 120 \
         https://chatgpt.com/codex/install.sh \
         -o "$install_script" \
     && echo "${CODEX_INSTALL_SHA256}  ${install_script}" | sha256sum -c - \
     && sh "$install_script" \
-    && codex --version \
-    && rm -f "$install_script"
+    && codex --version
 
 # 安裝技能
 RUN codex plugin marketplace add "https://gitea.jsc.idv.tw/plugins/doc.git" --ref "$CODEX_DOC_MARKETPLACE_REF" \