diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/pythonpublish.yml
index f101812..9f868a9 100644
--- a/.github/workflows/pythonpublish.yml
+++ b/.github/workflows/pythonpublish.yml
@@ -33,7 +33,7 @@ jobs:
   deploy-cython:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [macos-latest, windows-latest]
         python-version: ["3.7", "3.8", "3.9", "3.10"]
     runs-on: ${{ matrix.os }}
 
diff --git a/CHANGES.rst b/CHANGES.rst
index a533795..6650fce 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -13,6 +13,7 @@ Version 6.0.0
 * Changing `update` and `merge_update` to not use a keyword that could cause issues in rare circumstances
 * Fixing internal `_safe_key` logic to be twice as fast
 * Removing support for 3.6 as it is EOL
+* Removing support for ruamel.yaml < 0.17
 
 Version 5.4.1
 -------------
diff --git a/box/converters.py b/box/converters.py
index f32b8bb..eaf2ac3 100644
--- a/box/converters.py
+++ b/box/converters.py
@@ -143,7 +143,7 @@ def _to_yaml(
         elif pyyaml_available:
             return yaml.dump(obj, default_flow_style=default_flow_style, **yaml_kwargs)
         else:
-            raise BoxError("No YAML Parser available, please install ruamel.yaml>0.15 or PyYAML")
+            raise BoxError("No YAML Parser available, please install ruamel.yaml>0.17 or PyYAML")
 
 
 def _from_yaml(
diff --git a/requirements-test.txt b/requirements-test.txt
index a2493e8..91a12c3 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -2,7 +2,7 @@ coverage>=5.0.4
 msgpack>=1.0
 pytest>=5.4.1
 pytest-cov>=2.8.1
-ruamel.yaml>=0.16,<0.17
+ruamel.yaml>=0.17
 toml>=0.10.2
 types-PyYAML>=6.0.3
 types-toml>=0.1.3
diff --git a/requirements.txt b/requirements.txt
index bdccd9b..b245b05 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 msgpack>=1.0.0
-ruamel.yaml>=0.15
+ruamel.yaml>=0.17
 toml>=0.10.2
diff --git a/setup.py b/setup.py
index 0d3e61b..afc879a 100644
--- a/setup.py
+++ b/setup.py
@@ -65,9 +65,9 @@
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],
     extras_require={
-        "all": ["ruamel.yaml", "toml", "msgpack"],
-        "yaml": ["ruamel.yaml"],
-        "ruamel.yaml": ["ruamel.yaml"],
+        "all": ["ruamel.yaml>=0.17", "toml", "msgpack"],
+        "yaml": ["ruamel.yaml>=0.17"],
+        "ruamel.yaml": ["ruamel.yaml>=0.17"],
         "PyYAML": ["PyYAML"],
         "toml": ["toml"],
         "msgpack": ["msgpack"],