diff --git a/packages/memory-service/src/db/projects.js b/packages/memory-service/src/db/projects.js
index 548c104..db384fc 100644
--- a/packages/memory-service/src/db/projects.js
+++ b/packages/memory-service/src/db/projects.js
@@ -31,7 +31,11 @@ function updateProject(id, { name, description, colour, icon }) {
 
 function deleteProject(id) {
   const db = getDB();
-  db.prepare(`DELETE FROM projects WHERE id = ?`).run(id);
+  const doDelete = db.transaction(() => {
+    db.prepare(`UPDATE sessions SET project_id = NULL WHERE project_id = ?`).run(id);
+    db.prepare(`DELETE FROM projects WHERE id = ?`).run(id);
+  });
+  doDelete();
 }
 
 module.exports = { createProject, getProjects, getProject, updateProject, deleteProject };
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