diff --git a/core/dbt/contracts/graph/manifest.py b/core/dbt/contracts/graph/manifest.py
index 0db18aae935..a42efff676f 100644
--- a/core/dbt/contracts/graph/manifest.py
+++ b/core/dbt/contracts/graph/manifest.py
@@ -1406,7 +1406,7 @@ def is_invalid_protected_ref(
     def merge_from_artifact(
         self,
         adapter,
-        other: "WritableManifest",
+        other: "Manifest",
         selected: AbstractSet[UniqueID],
         favor_state: bool = False,
     ) -> None:
diff --git a/core/dbt/graph/selector_methods.py b/core/dbt/graph/selector_methods.py
index 10403ba04fc..c4bbcf27e6f 100644
--- a/core/dbt/graph/selector_methods.py
+++ b/core/dbt/graph/selector_methods.py
@@ -8,7 +8,7 @@
 
 from .graph import UniqueId
 
-from dbt.contracts.graph.manifest import Manifest, WritableManifest
+from dbt.contracts.graph.manifest import Manifest
 from dbt.contracts.graph.nodes import (
     SingularTestNode,
     Exposure,
@@ -725,7 +725,7 @@ def search(self, included_nodes: Set[UniqueId], selector: str) -> Iterator[Uniqu
                 f'Got an invalid selector "{selector}", expected one of ' f'"{list(state_checks)}"'
             )
 
-        manifest: WritableManifest = self.previous_state.manifest
+        manifest: Manifest = self.previous_state.manifest
 
         for unique_id, node in self.all_nodes(included_nodes):
             previous_node: Optional[SelectorTarget] = None
diff --git a/core/dbt/task/runnable.py b/core/dbt/task/runnable.py
index 8b361988517..d44f88cfc0b 100644
--- a/core/dbt/task/runnable.py
+++ b/core/dbt/task/runnable.py
@@ -15,7 +15,7 @@
 import dbt.utils
 from dbt.adapters.base import BaseRelation
 from dbt.adapters.factory import get_adapter
-from dbt.contracts.graph.manifest import WritableManifest
+from dbt.contracts.graph.manifest import Manifest
 from dbt.contracts.graph.nodes import ResultNode
 from dbt.artifacts.schemas.results import NodeStatus, RunningStatus, RunStatus, BaseResult
 from dbt.artifacts.schemas.run import RunExecutionResult, RunResult
@@ -643,7 +643,7 @@ def get_result(self, results, elapsed_time, generated_at):
     def task_end_messages(self, results):
         print_run_end_messages(results)
 
-    def _get_previous_state(self) -> Optional[WritableManifest]:
+    def _get_previous_state(self) -> Optional[Manifest]:
         state = self.previous_defer_state or self.previous_state
         if not state:
             raise DbtRuntimeError(
@@ -654,5 +654,5 @@ def _get_previous_state(self) -> Optional[WritableManifest]:
             raise DbtRuntimeError(f'Could not find manifest in --state path: "{state}"')
         return state.manifest
 
-    def _get_deferred_manifest(self) -> Optional[WritableManifest]:
+    def _get_deferred_manifest(self) -> Optional[Manifest]:
         return self._get_previous_state() if self.args.defer else None