diff --git a/etc/bash_completion.d/brew b/etc/bash_completion.d/brew
index 40a1174d0c..67c4c6a3d4 100644
--- a/etc/bash_completion.d/brew
+++ b/etc/bash_completion.d/brew
@@ -343,7 +343,7 @@ _brew_outdated() {
   local cur="${COMP_WORDS[COMP_CWORD]}"
   case "$cur" in
     --*)
-      __brewcomp "--quiet --json=v1"
+      __brewcomp "--quiet --json=v1 --fetch-HEAD"
       return
       ;;
   esac
@@ -520,6 +520,7 @@ _brew_upgrade() {
         --cleanup
         --debug
         --verbose
+        --fetch-HEAD
         "
       return
       ;;
diff --git a/share/zsh/site-functions/_brew b/share/zsh/site-functions/_brew
index 57b07d1cc3..f4f5ac81c4 100644
--- a/share/zsh/site-functions/_brew
+++ b/share/zsh/site-functions/_brew
@@ -139,6 +139,7 @@ case "$words[1]" in
   upgrade)
     _arguments \
       '(--cleanup)--cleanup[remove previously installed formula version(s)]' \
+      '(--fetch-HEAD)--fetch-HEAD[detect outdated installation by fetching the repo]' \
       '1: :->forms' && return 0
 
     if [[ "$state" == forms ]]; then