diff --git a/packages/backend-app-api/api-report.md b/packages/backend-app-api/api-report.md
index 8dc85d1728..1c05f14ddb 100644
--- a/packages/backend-app-api/api-report.md
+++ b/packages/backend-app-api/api-report.md
@@ -133,7 +133,7 @@ export interface HttpRouterFactoryOptions {
 // @public
 export type HttpServerCertificateOptions =
   | {
-      type: 'plain';
+      type: 'pem';
       key: string;
       cert: string;
     }
diff --git a/packages/backend-app-api/src/http/config.test.ts b/packages/backend-app-api/src/http/config.test.ts
index f54ba927ca..577bae08f3 100644
--- a/packages/backend-app-api/src/http/config.test.ts
+++ b/packages/backend-app-api/src/http/config.test.ts
@@ -53,7 +53,7 @@ describe('readHttpServerOptions', () => {
       {
         listen: { host: '', port: 7007 },
         https: {
-          certificate: { type: 'plain', cert: 'my-cert', key: 'my-key' },
+          certificate: { type: 'pem', cert: 'my-cert', key: 'my-key' },
         },
       },
     ],
diff --git a/packages/backend-app-api/src/http/config.ts b/packages/backend-app-api/src/http/config.ts
index e3b41c63de..ec29a8a044 100644
--- a/packages/backend-app-api/src/http/config.ts
+++ b/packages/backend-app-api/src/http/config.ts
@@ -93,7 +93,7 @@ function readHttpsOptions(config?: Config): HttpServerOptions['https'] {
 
   return {
     certificate: {
-      type: 'plain',
+      type: 'pem',
       cert: cc.getString('certificate.cert'),
       key: cc.getString('certificate.key'),
     },
diff --git a/packages/backend-app-api/src/http/types.ts b/packages/backend-app-api/src/http/types.ts
index ff96f69bff..2298ef11ff 100644
--- a/packages/backend-app-api/src/http/types.ts
+++ b/packages/backend-app-api/src/http/types.ts
@@ -51,7 +51,7 @@ export type HttpServerOptions = {
  */
 export type HttpServerCertificateOptions =
   | {
-      type: 'plain';
+      type: 'pem';
       key: string;
       cert: string;
     }
diff --git a/packages/backend-common/src/service/lib/ServiceBuilderImpl.ts b/packages/backend-common/src/service/lib/ServiceBuilderImpl.ts
index f74dcd9b64..f577017b77 100644
--- a/packages/backend-common/src/service/lib/ServiceBuilderImpl.ts
+++ b/packages/backend-common/src/service/lib/ServiceBuilderImpl.ts
@@ -102,7 +102,7 @@ export class ServiceBuilderImpl implements ServiceBuilder {
       this.serverOptions.https = {
         certificate: {
           ...settings.certificate,
-          type: 'plain',
+          type: 'pem',
         },
       };
     }