diff --git a/README.md b/README.md
index caa961b..685832f 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Generic document management service with S3 storage and PDF field discovery.
 
 ### Upload Document
 ```
-POST /api/documents/upload
+POST /api/v1/documents/upload
 Content-Type: multipart/form-data
 Authorization: Bearer <token>
 
@@ -34,7 +34,7 @@ Response:
 
 ### Rewrite Document
 ```
-PUT /api/documents/{document_id}
+PUT /api/v1/documents/{document_id}
 Content-Type: multipart/form-data
 Authorization: Bearer <token>
 
@@ -52,7 +52,7 @@ Response:
 
 ### Get Document Metadata
 ```
-GET /api/documents/{document_id}
+GET /api/v1/documents/{document_id}
 Authorization: Bearer <token>
 
 Response:
@@ -72,7 +72,7 @@ Response:
 
 ### Get Download URL
 ```
-GET /api/documents/{document_id}/download-url?expires_in=3600
+GET /api/v1/documents/{document_id}/download-url?expires_in=3600
 Authorization: Bearer <token>
 
 Response:
@@ -85,7 +85,7 @@ Response:
 
 ### Get PDF Fields
 ```
-GET /api/documents/{document_id}/fields
+GET /api/v1/documents/{document_id}/fields
 Authorization: Bearer <token>
 
 Response:
@@ -106,7 +106,7 @@ Response:
 
 ### Delete Document
 ```
-DELETE /api/documents/{document_id}
+DELETE /api/v1/documents/{document_id}
 Authorization: Bearer <token>
 
 Response:
diff --git a/app/routers/documents.py b/app/routers/documents.py
index eeb6b67..8cccdc4 100644
--- a/app/routers/documents.py
+++ b/app/routers/documents.py
@@ -7,7 +7,7 @@ from app.enums import DocumentType
 from app.models import DocumentMetadata, UploadResponse, DownloadUrlResponse, FieldsResponse
 from app.logger import get_logger
 
-router = APIRouter(prefix="/api/documents", tags=["documents"])
+router = APIRouter(prefix="/api/v1/documents", tags=["documents"])
 logger = get_logger(__name__)
 
 @router.post("/upload", response_model=UploadResponse)
diff --git a/tests/test_documents.py b/tests/test_documents.py
index 95fd63b..9f386b9 100644
--- a/tests/test_documents.py
+++ b/tests/test_documents.py
@@ -39,7 +39,7 @@ class TestDocumentUpload:
             headers = {"Authorization": sample_auth_token}
             
             response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -61,7 +61,7 @@ class TestDocumentUpload:
             headers = {"Authorization": sample_auth_token}
             
             response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -80,7 +80,7 @@ class TestDocumentUpload:
             headers = {"Authorization": sample_auth_token}
             
             response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -97,7 +97,7 @@ class TestDocumentUpload:
             data = {"org_id": "test-org-123"}
             
             response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data
             )
@@ -113,7 +113,7 @@ class TestDocumentUpload:
             headers = {"Authorization": "Invalid token"}
             
             response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -127,7 +127,7 @@ class TestDocumentUpload:
         headers = {"Authorization": sample_auth_token}
         
         response = test_client.post(
-            "/api/documents/upload",
+            "/api/v1/documents/upload",
             data=data,
             headers=headers
         )
@@ -145,7 +145,7 @@ class TestDocumentMetadata:
         headers = {"Authorization": sample_auth_token}
         
         response = test_client.get(
-            "/api/documents/test-doc-456",
+            "/api/v1/documents/test-doc-456",
             params={"org_id": "test-org-123"},
             headers=headers
         )
@@ -155,7 +155,7 @@ class TestDocumentMetadata:
     
     def test_get_document_without_auth_returns_401(self, test_client):
         """Test getting document without auth returns 401."""
-        response = test_client.get("/api/documents/test-doc-456")
+        response = test_client.get("/api/v1/documents/test-doc-456")
         
         assert response.status_code == 401
 
@@ -168,7 +168,7 @@ class TestDownloadUrl:
         headers = {"Authorization": sample_auth_token}
         
         response = test_client.get(
-            "/api/documents/test-doc-456/download-url",
+            "/api/v1/documents/test-doc-456/download-url",
             params={"org_id": "test-org-123"},
             headers=headers
         )
@@ -178,7 +178,7 @@ class TestDownloadUrl:
     
     def test_get_download_url_without_auth_returns_401(self, test_client):
         """Test getting download URL without auth returns 401."""
-        response = test_client.get("/api/documents/test-doc-456/download-url")
+        response = test_client.get("/api/v1/documents/test-doc-456/download-url")
         
         assert response.status_code == 401
 
@@ -195,7 +195,7 @@ class TestPDFFieldDiscovery:
             headers = {"Authorization": sample_auth_token}
             
             upload_response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -207,7 +207,7 @@ class TestPDFFieldDiscovery:
             # Get fields
             headers = {"Authorization": sample_auth_token}
             response = test_client.get(
-                f"/api/documents/{document_id}/fields",
+                f"/api/v1/documents/{document_id}/fields",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
@@ -235,7 +235,7 @@ class TestPDFFieldDiscovery:
             headers = {"Authorization": sample_auth_token}
             
             upload_response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -247,7 +247,7 @@ class TestPDFFieldDiscovery:
             # Get fields
             headers = {"Authorization": sample_auth_token}
             response = test_client.get(
-                f"/api/documents/{document_id}/fields",
+                f"/api/v1/documents/{document_id}/fields",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
@@ -266,7 +266,7 @@ class TestPDFFieldDiscovery:
             headers = {"Authorization": sample_auth_token}
             
             upload_response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -278,7 +278,7 @@ class TestPDFFieldDiscovery:
             # Get fields
             headers = {"Authorization": sample_auth_token}
             response = test_client.get(
-                f"/api/documents/{document_id}/fields",
+                f"/api/v1/documents/{document_id}/fields",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
@@ -290,7 +290,7 @@ class TestPDFFieldDiscovery:
     
     def test_get_pdf_fields_without_auth_returns_401(self, test_client):
         """Test getting PDF fields without auth returns 401."""
-        response = test_client.get("/api/documents/test-doc-456/fields")
+        response = test_client.get("/api/v1/documents/test-doc-456/fields")
         
         assert response.status_code == 401
 
@@ -303,7 +303,7 @@ class TestDocumentDeletion:
         headers = {"Authorization": sample_auth_token}
         
         response = test_client.delete(
-            "/api/documents/test-doc-456",
+            "/api/v1/documents/test-doc-456",
             params={"org_id": "test-org-123"},
             headers=headers
         )
@@ -313,7 +313,7 @@ class TestDocumentDeletion:
     
     def test_delete_document_without_auth_returns_401(self, test_client):
         """Test deleting document without auth returns 401."""
-        response = test_client.delete("/api/documents/test-doc-456")
+        response = test_client.delete("/api/v1/documents/test-doc-456")
         
         assert response.status_code == 401
 
@@ -418,7 +418,7 @@ class TestCompleteWorkflow:
             headers = {"Authorization": sample_auth_token}
             
             upload_response = test_client.post(
-                "/api/documents/upload",
+                "/api/v1/documents/upload",
                 files=files,
                 data=data,
                 headers=headers
@@ -430,28 +430,28 @@ class TestCompleteWorkflow:
             # Get metadata
             headers = {"Authorization": sample_auth_token}
             metadata_response = test_client.get(
-                f"/api/documents/{document_id}",
+                f"/api/v1/documents/{document_id}",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
             
             # Get fields
             fields_response = test_client.get(
-                f"/api/documents/{document_id}/fields",
+                f"/api/v1/documents/{document_id}/fields",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
             
             # Get download URL
             download_response = test_client.get(
-                f"/api/documents/{document_id}/download-url",
+                f"/api/v1/documents/{document_id}/download-url",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )
             
             # Delete document
             delete_response = test_client.delete(
-                f"/api/documents/{document_id}",
+                f"/api/v1/documents/{document_id}",
                 params={"org_id": "test-org-123"},
                 headers=headers
             )