diff --git a/lib/ulib/vcs b/lib/ulib/vcs
index 155f28b..b7dcca9 100644
--- a/lib/ulib/vcs
+++ b/lib/ulib/vcs
@@ -456,11 +456,64 @@ function git_update() {
         return $?
     fi
 
-    local orig_branch restore_branch remote rbranch pbranch
-    local -a branches
+    local branch orig_branch restore_branch remote rbranch pbranch
+    local -a branches prbranches crbranches dbranches
 
+    array_from_lines prbranches "$(git_list_rbranches)"
     git fetch -p "$@" || return
+    array_from_lines crbranches "$(git_list_rbranches)"
 
+    # vérifier s'il n'y a pas des branches distantes qui ont été supprimées
+    for branch in "${prbranches[@]}"; do
+        if ! array_contains crbranches "$branch"; then
+            array_add dbranches "${branch#*/}"
+        fi
+    done
+    if [ ${#dbranches[*]} -gt 0 ]; then
+        eimportant "One or more distant branches where deleted"
+        for branch in "${dbranches[@]}"; do
+            if git_have_branch "$branch"; then
+                if ! ask_yesno "Do you want to delete local branch $branch?" X; then
+                    array_del dbranches "$branch"
+                fi
+            fi
+        done
+    fi
+    if [ ${#dbranches[*]} -gt 0 ]; then
+        array_from_lines branches "$(git_list_branches)"
+        branch="$(git_get_branch)"
+        if array_contains dbranches "$branch"; then
+            # si la branche courante est l'une des branches à supprimer, il faut
+            # basculer vers develop ou master
+            local swto
+            if [ -z "$swto" ] && array_contains branches develop && ! array_contains dbranches develop; then
+                swto=develop
+            fi
+            if [ -z "$swto" ] && array_contains branches master && ! array_contains dbranches master; then
+                swto=master
+            fi
+            if ! git_check_cleancheckout; then
+                echo "* There are uncommitted local changes. However current branch is slated for removal.
+Make your verifications then delete the local branches:
+    ${swto:+$(qvals git checkout "$swto")
+    }$(qvals git branch -D "${dbranches[@]}")"
+                return 1
+            fi
+            if [ -n "$swto" ]; then
+                git checkout -q "$swto"
+            else
+                echo "* Current branch is slated for removal but I don't know to which branch I should switch first.
+Make your choice then delete the local branches:
+    $(qvals git branch -D "${dbranches[@]}")"
+                return 1
+            fi
+        fi
+        for branch in "${dbranches[@]}"; do
+            git branch -D "$branch"
+        done
+    fi
+
+    # intégrer les modifications dans les branches locales
     if ! git_check_cleancheckout; then
         branch="$(git_get_branch)"
         remote="$(git_get_branch_remote "$branch")"