diff --git a/backend/experiment/rules/speech2song.py b/backend/experiment/rules/speech2song.py
index 2de84bbd5..7cf31b9e3 100644
--- a/backend/experiment/rules/speech2song.py
+++ b/backend/experiment/rules/speech2song.py
@@ -24,7 +24,7 @@
 class Speech2Song(Base):
     """ Rules for a speech-to-song experiment """
     ID = 'SPEECH_TO_SONG'
-    
+
     def __init__(self):
         self.question_series = [
             {
diff --git a/backend/experiment/rules/util/practice.py b/backend/experiment/rules/util/practice.py
index 43004242c..81dddb8fe 100644
--- a/backend/experiment/rules/util/practice.py
+++ b/backend/experiment/rules/util/practice.py
@@ -7,7 +7,7 @@
 
 
 def get_practice_views(
-    session, 
+    session,
     intro_explainer,
     first_trial_callback,
     trial_callback,
@@ -30,7 +30,7 @@ def get_practice_views(
     trial_condition = get_trial_condition_block(session, 2)
     previous_results = session.result_set.order_by('-created_at')
     if not results_count:
-        # first practice trial 
+        # first practice trial
         return trial_callback(session, trial_condition, difficulty)
     last_result = previous_results.first()
     if results_count < 4:
@@ -116,7 +116,7 @@ def start_experiment_explainer():
 
 
 def get_trial_condition_block(session, n_trials_per_block):
-    """ make a list of n_trials_per_blocks conditions, of which one is catch (=1) 
+    """ make a list of n_trials_per_blocks conditions, of which one is catch (=1)
     store updates in the session.json_data field
     """
     json_data = session.load_json_data()
@@ -132,9 +132,8 @@ def get_trial_condition_block(session, n_trials_per_block):
 
 
 def get_trial_condition(n_choices):
-    """ get randomized trial condition 
+    """ get randomized trial condition
     return an integer between 0 and n_choices-2
     """
     options = np.arange(n_choices)
     return np.random.choice(options)
-    
\ No newline at end of file
diff --git a/backend/requirements.in/base.txt b/backend/requirements.in/base.txt
index c964ce6df..e2d075a60 100644
--- a/backend/requirements.in/base.txt
+++ b/backend/requirements.in/base.txt
@@ -33,3 +33,6 @@ genbadge[coverage]
 
 # Convert markdown to html
 django-markup[all_filter_dependencies]
+
+# Numpy
+numpy
diff --git a/backend/requirements/dev.txt b/backend/requirements/dev.txt
index fc27ca334..ff5b4aeb5 100644
--- a/backend/requirements/dev.txt
+++ b/backend/requirements/dev.txt
@@ -67,6 +67,8 @@ mccabe==0.7.0
     # via
     #   flake8
     #   pylint
+numpy==2.0.0
+    # via -r requirements.in/base.txt
 packaging==23.2
     # via build
 pillow==10.3.0
diff --git a/backend/requirements/prod.txt b/backend/requirements/prod.txt
index 346b13765..0ca5039f6 100644
--- a/backend/requirements/prod.txt
+++ b/backend/requirements/prod.txt
@@ -48,6 +48,8 @@ idna==3.7
     # via requests
 markdown==3.5.2
     # via django-markup
+numpy==2.0.0
+    # via -r requirements.in/base.txt
 packaging==24.1
     # via gunicorn
 pillow==10.3.0