diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 00000000..762eb745
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+numpy==1.25.0
+pandas==2.0.2
+python-dateutil==2.8.2
+pytz==2023.3
+six==1.16.0
+tzdata==2023.3
diff --git a/src/general_analysis.py b/src/general_analysis.py
index 2e5d2807..6f4266a1 100644
--- a/src/general_analysis.py
+++ b/src/general_analysis.py
@@ -20,7 +20,7 @@ count_tweets = tweets_all_combined["tweet_id"].value_counts().shape[0]
 count_police_accounts = tweets_all_combined["user_id"].value_counts().shape[0]
 date_first_tweet = datetime.strptime(tweets_all_combined['created_at'].min(), date_format_str)
 date_last_tweet = datetime.strptime(tweets_all_combined['created_at'].max(), date_format_str)
-day_diff = (date_last_tweet-date_first_tweet).days
+day_diff = (date_last_tweet - date_first_tweet).days
 
 
 def hr_func(ts):