diff --git a/templates/truth.html.tera b/templates/truth.html.tera
index dca3ffd..14df3e5 100644
--- a/templates/truth.html.tera
+++ b/templates/truth.html.tera
@@ -1,3 +1,9 @@
+{%- set is_disabled = "" -%}
+{# If we are not during the active week, prevent changing vote but not sending a missing one. #}
+{%- if week_data.is_last_week != true and user.votes | filter(attribute="truth_id", value=truth.id) -%}
+    {%- set is_disabled = "disabled" -%}
+{%- endif -%}
+
 <div class="individual_truth">
     <h3>Vérité {{ truth.number }}</h3>
     <p>{{ truth.rendered_text | safe }}</p>
@@ -8,10 +14,10 @@
         Tu l'as fait :)
         {%- else -%}
         Qui l'a fait ?
-        <select form="truths" name="truth_votes[{{ truth.id }}]">
+        <select form="truths" name="truth_votes[{{ truth.id }}]" {{ is_disabled }}>
                 <option value="0">---</option>
             {% for  player in other_players %}
-                {# Check if we should pre-select an existing vote #}
+                {# Check if we should pre-select an existing vote. #}
                 {% set_global is_selected = "" %}
                 {% for vote in user.votes %}
                     {% if truth.id == vote.truth_id and player.id == vote.voted_id %}