diff --git a/pyproject.toml b/pyproject.toml
index 316ebce..0fd2a7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,7 @@ dependencies = [
     "ase",
     "ruamel.yaml>=0.16.5",
     "cp2k-output-tools",
+    "aiida-pseudo~=1.2",
 ]
 
 [[project.authors]]