diff --git a/src/config.ts b/src/config.ts
index 299e25d..4ee3a54 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,6 +1,13 @@
+export enum EnvType {
+  PROD = 'PROD',
+  PREPROD = 'PREPROD',
+  DEV = 'DEV',
+}
+
 export type AppInsightsCreds = { appId: string; appKey: string }
 
 export type Environment = {
+  env: EnvType
   appInsightsCreds: AppInsightsCreds
 }
 
@@ -30,26 +37,29 @@ const config = {
     tlsEnabled: get('REDIS_TLS_ENABLED', 'false'),
     tlsVerification: get('REDIS_TLS_VERIFICATION', 'true'),
   },
-  environments: {
-    dev: {
+  environments: [
+    {
+      env: EnvType.DEV,
       appInsightsCreds: {
         appId: get('DEV_APPINSIGHTS_ID'),
         appKey: get('DEV_APPINSIGHTS_KEY'),
       },
-    } as Environment,
-    // preprod: {
-    //   appInsightsCreds: {
-    //     appId: get('PREPROD_APPINSIGHTS_ID'),
-    //     appKey: get('PREPROD_APPINSIGHTS_KEY'),
-    //   },
-    // } as Environment,
-    // prod: {
-    //   appInsightsCreds: {
-    //     appId: get('PROD_APPINSIGHTS_ID'),
-    //     appKey: get('PROD_APPINSIGHTS_KEY'),
-    //   },
-    // } as Environment,
-  },
+    },
+    {
+      env: EnvType.PREPROD,
+      appInsightsCreds: {
+        appId: get('PREPROD_APPINSIGHTS_ID'),
+        appKey: get('PREPROD_APPINSIGHTS_KEY'),
+      },
+    },
+    {
+      env: EnvType.PROD,
+      appInsightsCreds: {
+        appId: get('PROD_APPINSIGHTS_ID'),
+        appKey: get('PROD_APPINSIGHTS_KEY'),
+      },
+    },
+  ] as Environment[],
 }
 
 export default config
diff --git a/src/data/appInsights/index.ts b/src/data/appInsights/index.ts
index e873a28..0aec949 100644
--- a/src/data/appInsights/index.ts
+++ b/src/data/appInsights/index.ts
@@ -1,10 +1,10 @@
-import { type Environment } from '../../config'
+import { type AppInsightsCreds } from '../../config'
 import { type Dependency } from '../Components'
 import AppInsights from './Client'
 import Queries from './queries'
 
-const getDependencies = async (env: Environment): Promise<Dependency[]> => {
-  const appInsights = new AppInsights(env.appInsightsCreds)
+const getDependencies = async (appInsightsCreds: AppInsightsCreds): Promise<Dependency[]> => {
+  const appInsights = new AppInsights(appInsightsCreds)
   const results = await appInsights.query(Queries.DEPENDENCIES())
 
   return results.rows.map(row => ({ componentName: row[0], dependencyHostname: row[1], type: row[2] }))
diff --git a/src/run.ts b/src/run.ts
index 2dc44bf..53f8020 100644
--- a/src/run.ts
+++ b/src/run.ts
@@ -1,16 +1,30 @@
 import initialiseAppInsights from './utils/appInsights'
 import applicationInfo from './utils/applicationInfo'
 
-import config from './config'
+import config, { type Environment } from './config'
 import gatherDependencyInfo from './dependency-info-gatherer'
 import getComponents from './data/serviceCatalogue'
 import getDependencies from './data/appInsights'
 import { createRedisClient } from './data/redis/redisClient'
 import RedisService from './data/redis/redisService'
 import logger from './utils/logger'
+import { type Components } from './data/Components'
 
 initialiseAppInsights(applicationInfo())
 
+const calculateDependencies = async ({ env, appInsightsCreds }: Environment, components: Components) => {
+  const dependencies = await getDependencies(appInsightsCreds)
+  const componentMap = components.buildComponentMap(dependencies)
+  const { categoryToComponent, componentDependencyInfo, missingServices } = gatherDependencyInfo(componentMap)
+
+  logger.info(`${env}: Services missing from service catalogue: \n\t${missingServices.join('\n\t')}`)
+
+  const categoryCounts = Object.entries(categoryToComponent).map(([category, comps]) => `${category} =>  ${comps.length}`)
+  logger.info(`${env}: Category freqs: \n${categoryCounts.join('\n')}`)
+
+  return [env, { categoryToComponent, componentDependencyInfo, missingServices }]
+}
+
 const run = async () => {
   const redisClient = createRedisClient()
   await redisClient.connect()
@@ -20,20 +34,13 @@ const run = async () => {
   logger.info(`Starting to gather dependency info`)
 
   const components = await getComponents(config.serviceCatalogueUrl)
-  const dependencies = await getDependencies(config.environments.dev)
-  const componentMap = components.buildComponentMap(dependencies)
-
-  const { categoryToComponent, componentDependencyInfo, missingServices } = gatherDependencyInfo(componentMap)
-
-  logger.info(`Services missing from service catalogue: \n\t${missingServices.join('\n\t')}`)
 
-  const categoryCounts = Object.entries(categoryToComponent).map(([category, comps]) => `${category} =>  ${comps.length}`)
-  logger.info(`Category freqs: \n${categoryCounts.join('\n')}`)
+  const componentDependencies = await Promise.all(config.environments.map(environment => calculateDependencies(environment, components)))
 
   logger.info(`Starting to publish dependency info`)
-  await redisService.write({ componentDependencyInfo, categoryToComponent })
+  await redisService.write(Object.fromEntries(componentDependencies))
+  logger.info(`Finished publishing dependency info`)
 
-  logger.info(`Finished publishing dependency info for ${Object.keys(componentMap).length} components`)
   await redisClient.quit()
 }