diff --git a/backend/billing/validation.py b/backend/billing/validation.py
index 3fe5126a25..a5368d7dda 100644
--- a/backend/billing/validation.py
+++ b/backend/billing/validation.py
@@ -20,7 +20,7 @@
 def validate_sdi_code(sdi_code: str) -> bool:
     sdi_code = sdi_code.upper()
 
-    if len(sdi_code) != 7:
+    if len(sdi_code) not in [6, 7]:
         raise SdiCodeIncorrectLengthError()
 
     if not sdi_code.isalnum():
diff --git a/pretix/Dockerfile b/pretix/Dockerfile
index 8d4b018928..9de48a9b80 100644
--- a/pretix/Dockerfile
+++ b/pretix/Dockerfile
@@ -6,7 +6,7 @@ RUN pip install boto3==1.35.14 \
     django-storages==1.14.4 \
     pretix-plugin-extended-api==0.1.14 \
     pretix-plugin-attendance-certificate==0.1.11 \
-    pretix-fattura-elettronica==0.2.15 \
+    pretix-fattura-elettronica==0.2.16 \
     pretix-plugin-advanced-stats==1.0.0
 
 RUN cd /pretix/src && DATABASE_HOST=demo make staticfiles