diff --git a/tensorboard/plugins/graph/tf_graph_common/common_test.ts b/tensorboard/plugins/graph/tf_graph_common/common_test.ts
index c9665fd9b66..7a691b21c94 100644
--- a/tensorboard/plugins/graph/tf_graph_common/common_test.ts
+++ b/tensorboard/plugins/graph/tf_graph_common/common_test.ts
@@ -566,6 +566,9 @@ async function slimGraphToHierarchy(
   );
 }
 
+// TODO: go/ts59upgrade - Remove this suppression after TS 5.9.2 upgrade
+// TS2345: Argument of type 'Uint8Array<ArrayBuffer>' is not assignable to parameter of type 'ArrayBuffer'.
+// @ts-ignore
 async function pbtxtToGraphDef(text: string): Promise<tf_graph_proto.GraphDef> {
   const encoder = new TextEncoder();
   return tf_graph_parser.parseGraphPbTxt(encoder.encode(text));
diff --git a/tensorboard/webapp/widgets/line_chart_v2/lib/worker/compact_data_series_test.ts b/tensorboard/webapp/widgets/line_chart_v2/lib/worker/compact_data_series_test.ts
index 458e874d5b6..0a1d50e63c3 100644
--- a/tensorboard/webapp/widgets/line_chart_v2/lib/worker/compact_data_series_test.ts
+++ b/tensorboard/webapp/widgets/line_chart_v2/lib/worker/compact_data_series_test.ts
@@ -141,6 +141,9 @@ describe('line_chart_v2/lib/compact_data_series', () => {
             length: 2,
           },
         ],
+        // TODO: go/ts59upgrade - Remove this suppression after TS 5.9.2 upgrade
+        // TS2322: Type 'Float32Array<ArrayBuffer>' is not assignable to type 'ArrayBuffer'.
+        // @ts-ignore
         flattenedSeries: new Float32Array([1, 2, 3]),
       };