diff --git a/dateparser/data/date_translation_data/de.py b/dateparser/data/date_translation_data/de.py
index 2a044a220..dcf9a0b11 100644
--- a/dateparser/data/date_translation_data/de.py
+++ b/dateparser/data/date_translation_data/de.py
@@ -37,8 +37,8 @@
     ],
     "september": [
         "sep",
-        "sept",
-        "september"
+        "september",
+        "Sept"
     ],
     "october": [
         "okt",
diff --git a/dateparser_data/cldr_language_data/date_translation_data/de.json b/dateparser_data/cldr_language_data/date_translation_data/de.json
index ce17b5940..8eb30291b 100644
--- a/dateparser_data/cldr_language_data/date_translation_data/de.json
+++ b/dateparser_data/cldr_language_data/date_translation_data/de.json
@@ -34,7 +34,6 @@
     ],
     "september": [
         "sep",
-        "sept",
         "september"
     ],
     "october": [
diff --git a/dateparser_data/supplementary_language_data/date_translation_data/de.yaml b/dateparser_data/supplementary_language_data/date_translation_data/de.yaml
index 945faca74..fd2372e3a 100644
--- a/dateparser_data/supplementary_language_data/date_translation_data/de.yaml
+++ b/dateparser_data/supplementary_language_data/date_translation_data/de.yaml
@@ -23,6 +23,8 @@ february:
     - Feber
 march:
     - Mrz
+september:
+    - Sept
 
 year:
     - Jahre