diff --git a/profile.conf b/profile.conf
index 4de128f..ca4b1d2 100755
--- a/profile.conf
+++ b/profile.conf
@@ -217,6 +217,12 @@ MATRIX_DEFAULT_CHARSET=kana
 
 [updates]
 # Section used by updates.sh
+#
+# UPDT_DEFAULT_BRANCH — Git branch used for update checks and upgrades.
+#   Defaults to 'master' when unset. Changing this value will cause
+#   profile_upgrade to automatically switch the local checkout to the new
+#   branch on the next upgrade and display a warning.
+#UPDT_DEFAULT_BRANCH=master
 
 [general]
 # General section allow to set any variable that can be used by the user.
diff --git a/profile.d/updates.sh b/profile.d/updates.sh
index 26a5076..5ad112c 100644
--- a/profile.d/updates.sh
+++ b/profile.d/updates.sh
@@ -35,8 +35,14 @@
 # ------------------------------------------------------------------------------
 
 export BASE_URL="https://git.geoffray-levasseur.org/fatalerrors/profile"
-export UPDT_URL="$BASE_URL/raw/branch/master"
-export ARCH_URL="$BASE_URL/archive/master.tar.gz"
+
+# Load [updates] configuration before building the URLs so that
+# UPDT_DEFAULT_BRANCH (if set in profile.conf) is already available.
+load_conf "updates"
+
+export UPDT_DEFAULT_BRANCH="${UPDT_DEFAULT_BRANCH:-master}"
+export UPDT_URL="$BASE_URL/raw/branch/$UPDT_DEFAULT_BRANCH"
+export ARCH_URL="$BASE_URL/archive/$UPDT_DEFAULT_BRANCH.tar.gz"
 
 # ------------------------------------------------------------------------------
 # Check whether a newer profile version is available
@@ -251,6 +257,35 @@ profile_upgrade()
             popd >/dev/null || return 1
             return 3
         }
+
+        # Resolve the target branch: explicit -b flag > config default > master
+        local target_branch="${branch:-${UPDT_DEFAULT_BRANCH:-master}}"
+        branch="$target_branch"
+
+        # Detect current local branch and warn+switch when it differs
+        local current_branch
+        current_branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
+        if [[ -n "$current_branch" && "$current_branch" != "$branch" ]]; then
+            disp W "Branch mismatch: currently on '$current_branch', configured branch is '$branch'."
+            if (( dry_run )); then
+                disp I "[dry-run] git fetch origin $branch"
+                disp I "[dry-run] git checkout $branch"
+                disp W "[dry-run] Branch would be changed from '$current_branch' to '$branch'."
+            else
+                git fetch origin "$branch" || {
+                    disp E "Git fetch failed for branch $branch."
+                    popd >/dev/null || return 1
+                    return 2
+                }
+                git checkout "$branch" || {
+                    disp E "Git checkout failed for branch $branch."
+                    popd >/dev/null || return 1
+                    return 2
+                }
+                disp W "Branch has been changed from '$current_branch' to '$branch'."
+            fi
+        fi
+
         if ! git diff --quiet || ! git diff --cached --quiet || [[ -n $(git ls-files --others --exclude-standard) ]]; then
             if (( force_git )); then
                 disp W "Force mode: local Git changes and untracked files will be lost."
@@ -281,44 +316,14 @@ profile_upgrade()
                 disp W "Upgrade may fail if the changes conflict with the upgrade."
             fi
         fi
-        if [[ -n "$branch" ]]; then
-            if (( dry_run )); then
-                disp I "[dry-run] git fetch origin $branch"
-                disp I "[dry-run] git checkout $branch"
-            else
-                git fetch origin "$branch" || {
-                    disp E "Git fetch failed for branch $branch."
-                    popd >/dev/null || return 1
-                    return 2
-                }
-                git checkout "$branch" || {
-                    disp E "Git checkout failed for branch $branch."
-                    popd >/dev/null || return 1
-                    return 2
-                }
-            fi
-        fi
-
         if (( dry_run )); then
-            if [[ -n "$branch" ]]; then
-                disp I "[dry-run] git pull origin $branch"
-            else
-                disp I "[dry-run] git pull"
-            fi
+            disp I "[dry-run] git pull origin $branch"
         else
-            if [[ -n "$branch" ]]; then
-                git pull origin "$branch" || {
-                    disp E "Git pull failed, upgrade not applied."
-                    popd >/dev/null || return 1
-                    return 2
-                }
-            else
-                git pull || {
-                    disp E "Git pull failed, upgrade not applied."
-                    popd >/dev/null || return 1
-                    return 2
-                }
-            fi
+            git pull origin "$branch" || {
+                disp E "Git pull failed, upgrade not applied."
+                popd >/dev/null || return 1
+                return 2
+            }
             disp I "Successfully upgraded using git."
         fi
         popd >/dev/null || return 1