diff --git a/dev-requirements.txt b/dev-requirements.txt
index a579139..4924544 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -8,4 +8,5 @@ psycopg2-binary==2.9.9
 pandera==0.18.3
 pytest==8.1.1
 pandas-datareader==0.10.0
-taskipy==1.12.2
\ No newline at end of file
+taskipy==1.12.2
+numpy==1.26.4
\ No newline at end of file
diff --git a/tests/test_schema_out.py b/tests/test_schema_out.py
index 0940581..a94c7b5 100644
--- a/tests/test_schema_out.py
+++ b/tests/test_schema_out.py
@@ -12,7 +12,7 @@
 def test_valid_schema():
     df = pd.DataFrame({
         'company': ['ABC Inc', 'company', 'Company 02'],
-        'currency': ['EUR', 'EUR', 'EUR'],
+        'currency': ['fail', 'EUR', 'EUR'],
         'operational_revenue': [1000, 2000, 3],
         'date': ['March 2022', '2022-03', '2022/03'],
         'file_id': ['str1', 'str2', 'str3'],