diff --git a/bin/menutube.5s.sh b/bin/menutube.5s.sh
index 3c042a7..51fdf36 100755
--- a/bin/menutube.5s.sh
+++ b/bin/menutube.5s.sh
@@ -238,7 +238,7 @@ release_tag_norm() {
 latest_release_tag_from_asset_url() {
   local tag
   tag="$(printf '%s' "$MENUTUBE_RELEASE_ASSET_URL" | /usr/bin/sed -n 's#.*releases/download/\([^/]*\)/.*#\1#p' | head -1)"
-  [[ -n "$tag" ]] || return 1
+  [[ -n "$tag" && "$tag" != "latest" ]] || return 1
   printf '%s' "$tag"
 }
 
@@ -318,18 +318,23 @@ release_check_cache_age() {
 maybe_refresh_release_check() {
   truthy "$MENUTUBE_CHECK_RELEASE_UPDATES" || return
   [[ "$MENUTUBE_RELEASE_CHECK_TTL_SECONDS" == <-> ]] || MENUTUBE_RELEASE_CHECK_TTL_SECONDS=86400
-  local age now lock_age
+  local age lock_file lock_mtime current_mtime now lock_age
   age="$(release_check_cache_age)"
   if [[ -n "$age" && "$age" -le "$MENUTUBE_RELEASE_CHECK_TTL_SECONDS" ]]; then
     return
   fi
-  now="$(date +%s 2>/dev/null || printf '0')"
-  lock_age="$(cache_mtime "${MENUTUBE_RELEASE_CHECK_CACHE}.lock")"
-  if [[ -n "$lock_age" && $(( now - lock_age )) -lt 120 ]]; then
-    return
-  fi
   mkdir -p "${MENUTUBE_RELEASE_CHECK_CACHE:h}" 2>/dev/null || return
-  : > "${MENUTUBE_RELEASE_CHECK_CACHE}.lock" 2>/dev/null || return
+  lock_file="${MENUTUBE_RELEASE_CHECK_CACHE}.lock"
+  lock_mtime="$(cache_mtime "$lock_file")"
+  if [[ -n "$lock_mtime" ]]; then
+    now="$(date +%s 2>/dev/null || printf '0')"
+    lock_age=$(( now - lock_mtime ))
+    if [[ "$lock_age" -gt 300 ]]; then
+      current_mtime="$(cache_mtime "$lock_file")"
+      [[ "$current_mtime" == "$lock_mtime" ]] && rm -f "$lock_file" 2>/dev/null || true
+    fi
+  fi
+  ( set -C; : > "$lock_file" ) 2>/dev/null || return
   "$SCRIPT" check-release >/dev/null 2>&1 &
 }