diff --git a/internal/env/config.go b/internal/env/config.go
index 1c89cc6..bc51c77 100644
--- a/internal/env/config.go
+++ b/internal/env/config.go
@@ -55,6 +55,7 @@ type Config struct {
 	Release            string   ``                                   // Release argument to use in applicable helm commands
 	Force              bool     `envconfig:"force_upgrade"`          // Pass --force-replace to applicable helm commands
 	ForceConflicts     bool     `split_words:"true"`                 // Pass --force-conflicts to `helm upgrade` (ДОБАВЛЕНО)
+	ServerSideApply    bool     `split_words:"true"`                 // Pass --server-side to `helm upgrade` (ADD THIS LINE)
 	AtomicUpgrade      bool     `split_words:"true"`                 // Pass --atomic to `helm upgrade`
 	CleanupOnFail      bool     `envconfig:"cleanup_failed_upgrade"` // Pass --cleanup-on-fail to `helm upgrade`
 	LintStrictly       bool     `split_words:"true"`                 // Pass --strict to `helm lint`
diff --git a/internal/run/upgrade.go b/internal/run/upgrade.go
index 1a17814..69c384c 100644
--- a/internal/run/upgrade.go
+++ b/internal/run/upgrade.go
@@ -22,6 +22,7 @@ type Upgrade struct {
 	timeout         string
 	force           bool
 	forceConflict   bool
+	serverSideApply bool
 	atomic          bool
 	cleanupOnFail   bool
 	historyMax      int
@@ -47,7 +48,8 @@ func NewUpgrade(cfg env.Config) *Upgrade {
 		reuseValues:     cfg.ReuseValues,
 		timeout:         cfg.Timeout,
 		force:           cfg.Force,
-		forceConflict:   cfg.ForceConflicts, // FIXED: Added missing struct mapping
+		forceConflict:   cfg.ForceConflicts,
+		serverSideApply: cfg.ServerSideApply,
 		atomic:          cfg.AtomicUpgrade,
 		cleanupOnFail:   cfg.CleanupOnFail,
 		historyMax:      cfg.HistoryMax,
@@ -71,9 +73,9 @@ func (u *Upgrade) Prepare() error {
 		return fmt.Errorf("release is required")
 	}
 
-	// Validation: prevent generating invalid flags together
-	if u.force && u.forceConflict {
-		return fmt.Errorf("cannot use both 'force' (--force-replace) and 'force_conflicts' (--force-conflicts) together")
+	// Safety check: Helm fails if both are passed
+	if u.force && (u.serverSideApply || u.forceConflict) {
+		return fmt.Errorf("cannot use 'force' (--force-replace) together with 'server_side_apply' or 'force_conflicts'")
 	}
 
 	args := u.globalFlags()
@@ -94,6 +96,9 @@ func (u *Upgrade) Prepare() error {
 	if u.timeout != "" {
 		args = append(args, "--timeout", u.timeout)
 	}
+	if u.serverSideApply {
+		args = append(args, "--server-side")
+	}
 	if u.force {
 		args = append(args, "--force-replace")
 	}