diff --git a/.azure/modules/functionApp/appSettings.bicep b/.azure/modules/functionApp/appSettings.bicep
index 37a7067a2..eeca797f2 100644
--- a/.azure/modules/functionApp/appSettings.bicep
+++ b/.azure/modules/functionApp/appSettings.bicep
@@ -11,7 +11,7 @@ resource webApp 'Microsoft.Web/sites@2023-12-01' existing = {
   name: webAppName
 }
 
-resource siteconfig 'Microsoft.Web/sites/config@2024-04-01' = {
+resource siteconfig 'Microsoft.Web/sites/config@2023-12-01' = {
   parent: webApp
   name: 'appsettings'
   properties: union(currentAppSettings, appSettings)
diff --git a/.azure/modules/functionApp/slackNotifier.bicep b/.azure/modules/functionApp/slackNotifier.bicep
index cce6842bd..fbd0629eb 100644
--- a/.azure/modules/functionApp/slackNotifier.bicep
+++ b/.azure/modules/functionApp/slackNotifier.bicep
@@ -80,7 +80,7 @@ resource storageAccount 'Microsoft.Storage/storageAccounts@2023-04-01' = {
   tags: tags
 }
 
-resource applicationServicePlan 'Microsoft.Web/serverfarms@2024-04-01' = {
+resource applicationServicePlan 'Microsoft.Web/serverfarms@2023-12-01' = {
   name: '${namePrefix}-slacknotifier-asp'
   location: location
   sku: {