diff --git a/.changes/unreleased/Under the Hood-20240201-125416.yaml b/.changes/unreleased/Under the Hood-20240201-125416.yaml
new file mode 100644
index 00000000000..ae1fab79ab7
--- /dev/null
+++ b/.changes/unreleased/Under the Hood-20240201-125416.yaml	
@@ -0,0 +1,6 @@
+kind: Under the Hood
+body: Start using `Mergeable` from dbt-common
+time: 2024-02-01T12:54:16.462414-08:00
+custom:
+  Author: QMalcolm
+  Issue: "9505"
diff --git a/core/dbt/contracts/graph/unparsed.py b/core/dbt/contracts/graph/unparsed.py
index a5ddf70560b..ba78f2d4860 100644
--- a/core/dbt/contracts/graph/unparsed.py
+++ b/core/dbt/contracts/graph/unparsed.py
@@ -7,6 +7,7 @@
     AdditionalPropertiesAllowed,
     AdditionalPropertiesMixin,
 )
+from dbt_common.contracts.util import Mergeable
 from dbt_common.exceptions import DbtInternalError, CompilationError
 from dbt_common.dataclass_schema import (
     dbtClassMixin,
@@ -22,10 +23,7 @@
     MaturityType,
     MeasureAggregationParameters,
 )
-from dbt.contracts.util import (
-    Mergeable,
-    Replaceable,
-)
+from dbt.contracts.util import Replaceable
 
 # trigger the PathEncoder
 import dbt_common.helper_types  # noqa:F401
diff --git a/core/dbt/contracts/project.py b/core/dbt/contracts/project.py
index 33db4e73fcf..01c2f063980 100644
--- a/core/dbt/contracts/project.py
+++ b/core/dbt/contracts/project.py
@@ -1,7 +1,8 @@
 from dbt import deprecations
-from dbt.contracts.util import Replaceable, Mergeable, list_str, Identifier
+from dbt.contracts.util import Replaceable, list_str, Identifier
 from dbt.adapters.contracts.connection import QueryComment
 from dbt_common.helper_types import NoValue
+from dbt_common.contracts.util import Mergeable
 from dbt_common.dataclass_schema import (
     dbtClassMixin,
     ValidationError,