diff --git a/argocd-operator/controllers/gitopspromoter/deployment.go b/argocd-operator/controllers/gitopspromoter/deployment.go
index 8893fd0ed27..20e56706910 100644
--- a/argocd-operator/controllers/gitopspromoter/deployment.go
+++ b/argocd-operator/controllers/gitopspromoter/deployment.go
@@ -68,6 +68,8 @@ func createControllerConfig() deploymentConfig {
 		securityContext: buildControllerSecurityContext(),
 		livenessProbe:   buildControllerLivenessProbe(),
 		readinessProbe:  buildControllerReadinessProbe(),
+		volumes:         buildControllerVolumes(),
+		volumeMounts:    buildControllerVolumeMounts(),
 	}
 }
 
@@ -445,6 +447,28 @@ func buildAPIServerArgs() []string {
 	}
 }
 
+// buildControllerVolumes provides writable storage for Git clones and temporary index files.
+func buildControllerVolumes() []corev1.Volume {
+	return []corev1.Volume{
+		{
+			Name: "tmp",
+			VolumeSource: corev1.VolumeSource{
+				EmptyDir: &corev1.EmptyDirVolumeSource{},
+			},
+		},
+	}
+}
+
+// buildControllerVolumeMounts mounts the controller's writable temporary storage.
+func buildControllerVolumeMounts() []corev1.VolumeMount {
+	return []corev1.VolumeMount{
+		{
+			Name:      "tmp",
+			MountPath: "/tmp",
+		},
+	}
+}
+
 // buildAPIServerVolumes builds the Volumes for the API Server
 func buildAPIServerVolumes(cr *argoproj.ArgoCD) []corev1.Volume {
 	return []corev1.Volume{
diff --git a/argocd-operator/controllers/gitopspromoter/deployment_test.go b/argocd-operator/controllers/gitopspromoter/deployment_test.go
index 17fcedf75e2..a7f5c8283cd 100644
--- a/argocd-operator/controllers/gitopspromoter/deployment_test.go
+++ b/argocd-operator/controllers/gitopspromoter/deployment_test.go
@@ -477,6 +477,8 @@ func TestReconcilePromoterControllerDeployment_PromoterEnabled(t *testing.T) {
 	assert.Equal(t, cfg.securityContext, retrievedDeployment.Spec.Template.Spec.Containers[0].SecurityContext)
 	assert.Equal(t, cfg.livenessProbe, retrievedDeployment.Spec.Template.Spec.Containers[0].LivenessProbe)
 	assert.Equal(t, cfg.readinessProbe, retrievedDeployment.Spec.Template.Spec.Containers[0].ReadinessProbe)
+	assert.Equal(t, cfg.volumeMounts, retrievedDeployment.Spec.Template.Spec.Containers[0].VolumeMounts)
+	assert.Equal(t, cfg.volumes, retrievedDeployment.Spec.Template.Spec.Volumes)
 }
 
 func TestReconcilePromoterAPIServerDeployment_PromoterDisabled(t *testing.T) {