diff --git a/pyproject.toml b/pyproject.toml
index 05b2bfd..8c882dc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
   "conda",
   "keyring",
   "requests",
-  "ruamel.yaml",
+  "ruamel.yaml<0.18",
 ]
 
 [project.entry-points.conda]
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index e50805a..7673a6c 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -22,7 +22,7 @@ requirements:
     - conda >=23.9.0
     - keyring
     - requests
-    - ruamel.yaml<18
+    - ruamel.yaml <18
 
 test:
   imports: