diff --git a/postman/NHS App - dev (NHS Login sandpit).postman_environment.json b/postman/NHS App - dev (NHS Login sandpit).postman_environment.json
index 47454ad..def529d 100644
--- a/postman/NHS App - dev (NHS Login sandpit).postman_environment.json	
+++ b/postman/NHS App - dev (NHS Login sandpit).postman_environment.json	
@@ -4,7 +4,7 @@
 	"values": [
 		{
 			"key": "base_url",
-			"value": "https://dev.api.service.nhs.uk",
+			"value": "https://dep.api.service.nhs.uk",
 			"enabled": true
 		},
 		{
@@ -41,4 +41,4 @@
 	"_postman_variable_scope": "environment",
 	"_postman_exported_at": "2021-02-10T23:55:54.828Z",
 	"_postman_exported_using": "Postman/7.36.3"
-}
\ No newline at end of file
+}
diff --git a/postman/NHS App.postman_collection.json b/postman/NHS App.postman_collection.json
index 80d987b..f872d8f 100644
--- a/postman/NHS App.postman_collection.json	
+++ b/postman/NHS App.postman_collection.json	
@@ -20,6 +20,19 @@
 						"type": "text/javascript",
 						"packages": {}
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -57,6 +70,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -148,6 +174,12 @@
 							"var uniqueId = pm.variables.replaceIn('{{$guid}}');",
 							"eval(pm.globals.get(\"jsrsasign-js\")); //import jsrsasign lib",
 							"",
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"oauth2/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"oauth2/\", \"oauth2-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}",
+							"",
 							"var header = {",
 							"    \"typ\": \"JWT\",",
 							"    \"alg\": \"RS512\",",
@@ -242,6 +274,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -302,6 +347,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -362,6 +420,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -422,6 +493,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -480,6 +564,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -543,6 +640,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
@@ -606,6 +716,19 @@
 						],
 						"type": "text/javascript"
 					}
+				},
+				{
+					"listen": "prerequest",
+					"script": {
+						"exec": [
+							"var baseNhsAppApiUrl = pm.environment.get(\"base_url\").toString()",
+							"//replace base url for sandpit(dev) environment which uses dep api proxy(nhs-app-dep-dev)",
+							"if(baseNhsAppApiUrl.includes(\"dep.api\") && pm.request.url.toString().includes(\"nhs-app/\")){",
+							"    pm.request.url = pm.request.url.toString().replace(\"nhs-app/\", \"nhs-app-dep/\").replace(\"{{base_url}}\", baseNhsAppApiUrl);",
+							"}"
+						],
+						"type": "text/javascript"
+					}
 				}
 			],
 			"request": {
diff --git a/specification/nhs-app.yaml b/specification/nhs-app.yaml
index 1d312cd..52b618e 100644
--- a/specification/nhs-app.yaml
+++ b/specification/nhs-app.yaml
@@ -62,11 +62,11 @@ info:
     After following these steps to create an application and register the public key, the App ID should be provided to the [NHS App onboarding team](mailto:app.onboarding@nhs.net) to grant your application permissions to the features that are appropriate to your use cases. If this step is not completed, all calls to this API will return responses with status code 403 Forbidden.
     
     ## Environments and testing
-    | API Environment      | NHS Login Environment | Base URL                                    |
-    | -------------------- | --------------------- | ------------------------------------------- |
-    | Development          | Sandpit               | `https://dev.api.service.nhs.uk/nhs-app/`   |
-    | Integration Testing  | Integration (AOS)     | `https://int.api.service.nhs.uk/nhs-app/`   |
-    | Production           | Production            | `https://api.service.nhs.uk/nhs-app/`       |
+    | API Environment      | NHS Login Environment | Base URL                                        |
+    | -------------------- | --------------------- | ----------------------------------------------- |
+    | Development          | Sandpit               | `https://dep.api.service.nhs.uk/nhs-app-dep/`   |
+    | Integration Testing  | Integration (AOS)     | `https://int.api.service.nhs.uk/nhs-app/`       |
+    | Production           | Production            | `https://api.service.nhs.uk/nhs-app/`           |
 
     ### Development
     Our development environment:
@@ -146,7 +146,7 @@ x-spec-publication:
   try-this-api:
     disabled: true
 servers:
-  - url: "https://dev.api.service.nhs.uk/nhs-app"
+  - url: "https://dep.api.service.nhs.uk/nhs-app-dep"
     description: Development environment.
   - url: "https://int.api.service.nhs.uk/nhs-app"
     description: Integration test environment.