diff --git a/completions/bash/brew b/completions/bash/brew
index fc313f57e4..42d694978e 100644
--- a/completions/bash/brew
+++ b/completions/bash/brew
@@ -2203,6 +2203,7 @@ _brew_up() {
       --help
       --merge
       --preinstall
+      --quiet
       --verbose
       "
       return
@@ -2221,6 +2222,7 @@ _brew_update() {
       --help
       --merge
       --preinstall
+      --quiet
       --verbose
       "
       return
diff --git a/completions/fish/brew.fish b/completions/fish/brew.fish
index 7e618a2bb3..29458d78f6 100644
--- a/completions/fish/brew.fish
+++ b/completions/fish/brew.fish
@@ -1472,6 +1472,7 @@ __fish_brew_complete_arg 'up' -l force -d 'Always do a slower, full update check
 __fish_brew_complete_arg 'up' -l help -d 'Show this message'
 __fish_brew_complete_arg 'up' -l merge -d 'Use `git merge` to apply updates (rather than `git rebase`)'
 __fish_brew_complete_arg 'up' -l preinstall -d 'Run on auto-updates (e.g. before `brew install`). Skips some slower steps'
+__fish_brew_complete_arg 'up' -l quiet -d 'Make some output more quiet'
 __fish_brew_complete_arg 'up' -l verbose -d 'Print the directories checked and `git` operations performed'
 
 
@@ -1481,6 +1482,7 @@ __fish_brew_complete_arg 'update' -l force -d 'Always do a slower, full update c
 __fish_brew_complete_arg 'update' -l help -d 'Show this message'
 __fish_brew_complete_arg 'update' -l merge -d 'Use `git merge` to apply updates (rather than `git rebase`)'
 __fish_brew_complete_arg 'update' -l preinstall -d 'Run on auto-updates (e.g. before `brew install`). Skips some slower steps'
+__fish_brew_complete_arg 'update' -l quiet -d 'Make some output more quiet'
 __fish_brew_complete_arg 'update' -l verbose -d 'Print the directories checked and `git` operations performed'
 
 
diff --git a/completions/zsh/_brew b/completions/zsh/_brew
index cb0c5c80ca..e83fa9dcc9 100644
--- a/completions/zsh/_brew
+++ b/completions/zsh/_brew
@@ -1802,6 +1802,7 @@ _brew_up() {
     '--help[Show this message]' \
     '--merge[Use `git merge` to apply updates (rather than `git rebase`)]' \
     '--preinstall[Run on auto-updates (e.g. before `brew install`). Skips some slower steps]' \
+    '--quiet[Make some output more quiet]' \
     '--verbose[Print the directories checked and `git` operations performed]'
 }
 
@@ -1813,6 +1814,7 @@ _brew_update() {
     '--help[Show this message]' \
     '--merge[Use `git merge` to apply updates (rather than `git rebase`)]' \
     '--preinstall[Run on auto-updates (e.g. before `brew install`). Skips some slower steps]' \
+    '--quiet[Make some output more quiet]' \
     '--verbose[Print the directories checked and `git` operations performed]'
 }