diff --git a/api/_lib/researchAnalysis.ts b/api/_lib/researchAnalysis.ts
index 760e342..55c894d 100644
--- a/api/_lib/researchAnalysis.ts
+++ b/api/_lib/researchAnalysis.ts
@@ -11,8 +11,8 @@
 
 import Anthropic from '@anthropic-ai/sdk'
 import { z } from 'zod'
-import type { ResearchItem } from './researchSources'
-import type { ResearchLead } from '../../src/domain/researchLead'
+import type { ResearchItem } from './researchSources.js'
+import type { ResearchLead } from '../../src/domain/researchLead.js'
 
 /**
  * Der Beurteilungsauftrag (§12).
diff --git a/api/_lib/researchSources.ts b/api/_lib/researchSources.ts
index ccd6d1a..f78dc9c 100644
--- a/api/_lib/researchSources.ts
+++ b/api/_lib/researchSources.ts
@@ -11,7 +11,7 @@
  */
 
 import * as cheerio from 'cheerio'
-import { RESEARCH_SOURCES } from '../../src/lib/researchSources'
+import { RESEARCH_SOURCES } from '../../src/lib/researchSources.js'
 
 /** Gemeinsames Minimalformat aller Quellen (§9). */
 export interface ResearchItem {
diff --git a/api/livia/research/refresh.ts b/api/livia/research/refresh.ts
index c29dce8..8140bcd 100644
--- a/api/livia/research/refresh.ts
+++ b/api/livia/research/refresh.ts
@@ -19,10 +19,10 @@ import {
   fetchZhkResearch,
   fetchGreaterZurichResearch,
   fetchZefixResearch,
-} from '../../_lib/researchSources'
-import type { ResearchItem } from '../../_lib/researchSources'
-import { analyzeResearchItems } from '../../_lib/researchAnalysis'
-import type { ResearchRefreshResult, ResearchSourceResult } from '../../../src/domain/researchLead'
+} from '../../_lib/researchSources.js'
+import type { ResearchItem } from '../../_lib/researchSources.js'
+import { analyzeResearchItems } from '../../_lib/researchAnalysis.js'
+import type { ResearchRefreshResult, ResearchSourceResult } from '../../../src/domain/researchLead.js'
 
 interface Quelle {
   id: string