diff --git a/tools/tlc/Makefile b/tools/tlc/Makefile
index 2de311b21..e50b9dd3f 100644
--- a/tools/tlc/Makefile
+++ b/tools/tlc/Makefile
@@ -19,7 +19,7 @@ dist: clean
 
 .PHONY: dev-install
 dev-install:
-	poetry lock -n && poetry export --without-hashes > requirements.txt
+	poetry lock -n --no-update && poetry export --without-hashes > requirements.txt
 	poetry install -n
 	-poetry run mypy --install-types --non-interactive ./