diff --git a/.changeset/fix-esm-extensions.md b/.changeset/fix-esm-extensions.md
new file mode 100644
index 0000000..32694db
--- /dev/null
+++ b/.changeset/fix-esm-extensions.md
@@ -0,0 +1,5 @@
+---
+"@beaconlabs-io/evidence": patch
+---
+
+Add .js file extensions to relative imports for proper ESM module resolution
diff --git a/scripts/bundle-content.ts b/scripts/bundle-content.ts
index a9731ca..05fc4b4 100644
--- a/scripts/bundle-content.ts
+++ b/scripts/bundle-content.ts
@@ -98,7 +98,7 @@ function bundleEvidence(): ValidationError[] {
   });
 
   const output = `// Auto-generated by bundle-content.ts - DO NOT EDIT
-import type { BundledEvidence } from "../types";
+import type { BundledEvidence } from "../types.js";
 
 export const evidence: Record<string, BundledEvidence> = ${JSON.stringify(evidence, null, 2)};
 
@@ -181,7 +181,7 @@ function bundleDeployments(): ValidationError[] {
   });
 
   const output = `// Auto-generated by bundle-content.ts - DO NOT EDIT
-import type { EvidenceDeployment } from "../types";
+import type { EvidenceDeployment } from "../types.js";
 
 export const deployments: Record<string, EvidenceDeployment> = ${JSON.stringify(deployments, null, 2)};
 
diff --git a/src/content/index.ts b/src/content/index.ts
index 146592f..e048fc0 100644
--- a/src/content/index.ts
+++ b/src/content/index.ts
@@ -3,15 +3,15 @@ import type {
   EvidenceFrontmatter,
   EvidenceDeployment,
   BundledEvidence,
-} from "../types";
+} from "../types.js";
 
 // These will be generated by the build script
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-ignore - Generated at build time
-import { evidence, evidenceSlugs } from "./evidence";
+import { evidence, evidenceSlugs } from "./evidence.js";
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-ignore - Generated at build time
-import { deployments, deploymentSlugs } from "./deployments";
+import { deployments, deploymentSlugs } from "./deployments.js";
 
 export { evidence, evidenceSlugs, deployments, deploymentSlugs };
 
diff --git a/src/index.ts b/src/index.ts
index 05d781c..3a08cb1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,5 @@
 // Re-export all types
-export * from "./types";
+export * from "./types.js";
 
 // Re-export content accessors
-export * from "./content";
+export * from "./content/index.js";