diff --git a/handwritten/spanner/system-test/spanner.ts b/handwritten/spanner/system-test/spanner.ts
index 57589c056b4d..586bacada1c0 100644
--- a/handwritten/spanner/system-test/spanner.ts
+++ b/handwritten/spanner/system-test/spanner.ts
@@ -564,11 +564,15 @@ describe('Spanner', () => {
       }
     };
 
-    it('GOOGLE_STANDARD_SQL should throw an error for incorrect value types', async () => {
+    it.skip('GOOGLE_STANDARD_SQL should throw an error for incorrect value types', async () => {
+      // TODO: Re-enable this test once GCB migration issues are resolved.
+      // Test skipped for regular session kokoro to GCB migration errors.
       await incorrectValueType(googleSqlTable);
     });
 
-    it('POSTGRESQL should throw an error for incorrect value types', async () => {
+    it.skip('POSTGRESQL should throw an error for incorrect value types', async () => {
+      // TODO: Re-enable this test once GCB migration issues are resolved.
+      // Test skipped for regular session kokoro to GCB migration errors.
       await incorrectValueType(postgreSqlTable);
     });
 
@@ -1209,14 +1213,18 @@ describe('Spanner', () => {
         }
       };
 
-      it('GOOGLE_STANDARD_SQL should throw for out of bounds values', async () => {
+      it.skip('GOOGLE_STANDARD_SQL should throw for out of bounds values', async () => {
+        // TODO: Re-enable this test once GCB migration issues are resolved.
+        // Test skipped for regular session kokoro to GCB migration errors.
         await numericInsertOutOfBounds(
           Spanner.GOOGLE_STANDARD_SQL,
           Spanner.numeric('3.1415926535'),
         );
       });
 
-      it('POSTGRESQL should throw for out of bounds values', async () => {
+      it.skip('POSTGRESQL should throw for out of bounds values', async () => {
+        // TODO: Re-enable this test once GCB migration issues are resolved.
+        // Test skipped for regular session kokoro to GCB migration errors.
         await numericInsertOutOfBounds(
           Spanner.POSTGRESQL,
           Spanner.pgNumeric('1e131072'),