diff --git a/dev.sh b/dev.sh
index 07fa3cc..9e12973 100755
--- a/dev.sh
+++ b/dev.sh
@@ -140,7 +140,7 @@ descriptions["test"]="Run the tests in the RAM DB and write a coverage report."
 tasks["test"]=test
 
 update() {
-    poetry update
+    poetry update --lock
 }
 descriptions["update"]="Update the dependencies."
 tasks["update"]=update