diff --git a/problems/005_problem.py b/problems/005_problem.py
index e13dbf3..9449d9d 100755
--- a/problems/005_problem.py
+++ b/problems/005_problem.py
@@ -15,6 +15,7 @@ import decorators			# Typically imported to compute execution duration of functi
 import time					# Typically imported for sleep function, to slow down execution in terminal.
 import typing
 import pprint
+import numpy
 
 # Create function that finds the next
 # prime number when supplied with an