diff --git a/cryptol-remote-api/python/pyproject.toml b/cryptol-remote-api/python/pyproject.toml
index 71748b28b..bd1acd880 100644
--- a/cryptol-remote-api/python/pyproject.toml
+++ b/cryptol-remote-api/python/pyproject.toml
@@ -23,4 +23,5 @@ typing-extensions = "^4.1.1"
 mypy = "^0.991"
 
 [build-system]
-requires = ["poetry>=1.1.4", "setuptools>=40.8.0"]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/deps/argo b/deps/argo
index a2a6e7f54..ef4cc2935 160000
--- a/deps/argo
+++ b/deps/argo
@@ -1 +1 @@
-Subproject commit a2a6e7f54551f20549dc5f48881f5b35d6f8c155
+Subproject commit ef4cc29359931789957853e79ee5c0e3a03d5844