diff --git a/requirements.txt b/requirements.txt
index 70a15e3..8c35dd7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-pyam-iamc >= 1.0  # the `pyam` package is released on pypi under this name
-nomenclature-iamc >= 0.11
+pyam-iamc >= 2.1  # the `pyam` package is released on pypi under this name
+nomenclature-iamc >= 0.16