diff --git a/artillery/psu_load_test.yml b/artillery/psu_load_test.yml
index c91afa02..2b7fbedd 100644
--- a/artillery/psu_load_test.yml
+++ b/artillery/psu_load_test.yml
@@ -4,15 +4,52 @@ config:
     expect: {}
     apdex: {}
   phases:
-    - name: ramp up phase
-      duration: "{{ $env.rampUpDuration }}"
-      arrivalRate: 1
-      rampTo: "{{ $env.arrivalRate }}"
-      maxVusers: "{{ $env.maxVusers }}"
-    - name: run phase
-      duration: "{{ $env.duration }}"
-      arrivalRate: "{{ $env.arrivalRate }}"
-      maxVusers: "{{ $env.maxVusers }}"
+    - name: ramp up phase 1
+      duration: 900 # 15 minutes
+      arrivalRate: 0
+      rampTo: 100
+      maxVusers: 100
+    - name: hold phase 1
+      duration: 900
+      arrivalRate: 100
+      maxVusers: 100
+    - name: ramp up phase 2
+      duration: 900
+      arrivalRate: 100
+      rampTo: 200
+      maxVusers: 200
+    - name: hold phase 2
+      duration: 900
+      arrivalRate: 200
+      maxVusers: 200
+    - name: ramp up phase 3
+      duration: 900
+      arrivalRate: 200
+      rampTo: 300
+      maxVusers: 300
+    - name: hold phase 3
+      duration: 900
+      arrivalRate: 300
+      maxVusers: 300
+    - name: ramp up phase 4
+      duration: 900
+      arrivalRate: 300
+      rampTo: 400
+      maxVusers: 400
+    - name: hold phase 4
+      duration: 900
+      arrivalRate: 400
+      maxVusers: 400
+    - name: ramp up phase 5
+      duration: 900
+      arrivalRate: 400
+      rampTo: 500
+      maxVusers: 500
+    - name: hold phase 5
+      duration: 900
+      arrivalRate: 500
+      maxVusers: 500
+
   environments:
     dev:
       target: https://internal-dev.api.service.nhs.uk/