diff --git a/backend/requirements.txt b/backend/requirements.txt
index 53322872..1ea6c457 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -1,7 +1,7 @@
 apache-beam~=2.41.0
 boto3~=1.24.68
 en_core_web_sm@https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.2.0/en_core_web_sm-3.2.0-py3-none-any.whl
-explainaboard == 0.11.1
+explainaboard == 0.11.2
 Flask-PyMongo~=2.3.0
 google-cloud-storage~=2.5.0
 iso-639~=0.4.5
diff --git a/backend/src/impl/db_utils/db_utils.py b/backend/src/impl/db_utils/db_utils.py
index 9b98f5a4..37ff4fe9 100644
--- a/backend/src/impl/db_utils/db_utils.py
+++ b/backend/src/impl/db_utils/db_utils.py
@@ -19,10 +19,10 @@ class DBCollection:
 class DBUtils:
 
     # Names of DBs or collections
-    SYSTEM_OUTPUT_COLLECTION_DB = "system_output_collections_v011"
+    SYSTEM_OUTPUT_COLLECTION_DB = "system_output_collections_v012"
     SYSTEM_OUTPUT_COLLECTION_PREFIX = "system_outputs"
     DEV_SYSTEM_METADATA = DBCollection(
-        db_name="metadata", collection_name="system_metadata_v011"
+        db_name="metadata", collection_name="system_metadata_v012"
     )
 
     @staticmethod
diff --git a/backend/src/impl/db_utils/system_db_utils.py b/backend/src/impl/db_utils/system_db_utils.py
index b6107925..0dd89622 100644
--- a/backend/src/impl/db_utils/system_db_utils.py
+++ b/backend/src/impl/db_utils/system_db_utils.py
@@ -5,15 +5,13 @@
 import traceback
 import zlib
 from datetime import datetime
-from inspect import getsource
-from types import FunctionType
 from typing import Any
 
 from bson import ObjectId
 from explainaboard import DatalabLoaderOption, FileType, Source, get_processor
 from explainaboard.loaders.file_loader import FileLoaderReturn
 from explainaboard.loaders.loader_registry import get_loader_class
-from explainaboard.utils.serialization import general_to_dict
+from explainaboard.serialization.legacy import general_to_dict
 from explainaboard_web.impl.auth import get_user
 from explainaboard_web.impl.db_utils.dataset_db_utils import DatasetDBUtils
 from explainaboard_web.impl.db_utils.db_utils import DBUtils
@@ -104,6 +102,7 @@ def system_from_dict(
         if "metric_stats" in document:
             metric_stats = document["metric_stats"]
             document["metric_stats"] = []
+
         system = System.from_dict(document)
         if include_metric_stats:
             # Unbinarize to numpy array and set explicitly
@@ -486,12 +485,6 @@ def db_operations(session: ClientSession) -> str:
 
             # -- replace things that can't be returned through JSON for now
             system.metric_stats = []
-            for analysis_level in system.system_info.analysis_levels:
-                for feature_name, feature in analysis_level.features.items():
-                    if isinstance(feature.func, FunctionType):
-                        # Convert the function to a string, this is noqa to prevent a
-                        # typing error
-                        feature.func = getsource(feature.func)  # noqa
 
             # -- return the system
             return system
diff --git a/backend/src/impl/default_controllers_impl.py b/backend/src/impl/default_controllers_impl.py
index 9a8c5c6f..9f9b96fb 100644
--- a/backend/src/impl/default_controllers_impl.py
+++ b/backend/src/impl/default_controllers_impl.py
@@ -14,8 +14,8 @@
 from explainaboard.info import SysOutputInfo
 from explainaboard.loaders import get_loader_class
 from explainaboard.metrics.metric import SimpleMetricStats
+from explainaboard.serialization.legacy import general_to_dict
 from explainaboard.utils.cache_api import get_cache_dir, open_cached_file, sanitize_path
-from explainaboard.utils.serialization import general_to_dict
 from explainaboard.utils.typing_utils import narrow
 from explainaboard_web.impl.analyses.significance_analysis import (
     pairwise_significance_test,
diff --git a/frontend/src/components/Analysis/types.tsx b/frontend/src/components/Analysis/types.tsx
index 7c2359c7..1a69d176 100644
--- a/frontend/src/components/Analysis/types.tsx
+++ b/frontend/src/components/Analysis/types.tsx
@@ -30,24 +30,6 @@ export interface ResultFineGrainedParsed {
   cases: number[][];
 }
 
-export interface SystemInfoFeatureBucketInfo {
-  method: string;
-  number: number;
-  setting: number | number[];
-}
-
-export interface SystemInfoFeature {
-  /**
-   * A single feature in the system info class.
-   */
-  bucket_info: SystemInfoFeatureBucketInfo | null;
-  description: string | null;
-  dtype?: string;
-  is_bucket: boolean;
-  require_training_set: boolean;
-  _type: string;
-}
-
 export interface BucketIntervals {
   /**
    * Intervals over which to perform bucketing
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
index 099a19c1..43211803 100644
--- a/openapi/openapi.yaml
+++ b/openapi/openapi.yaml
@@ -2,7 +2,7 @@ openapi: "3.0.0"
 info:
   title: "ExplainaBoard"
   description: "Backend APIs for ExplainaBoard"
-  version: "0.2.5"
+  version: "0.2.6"
   contact:
     email: "explainaboard@gmail.com"
   license:
@@ -628,15 +628,20 @@ components:
       properties:
         dtype:
           type: string
+          nullable: true
         cls_name:
           type: string
         description:
           type: string
+          nullable: true
         func:
           type: string
+          nullable: true
         require_training_set:
           type: boolean
-      required: [dtype, cls_name]
+          nullable: true
+      additionalProperties: true
+      required: [cls_name]
 
     SystemInfo:
       description: |
@@ -666,7 +671,7 @@ components:
           example: en
         reload_stat:
           type: boolean
-        conf_value:
+        confidence_alpha:
           type: number
         system_details:
           type: object
@@ -703,7 +708,7 @@ components:
           source_language,
           target_language,
           reload_stat,
-          conf_value,
+          confidence_alpha,
           source_tokenizer,
           target_tokenizer,
           analysis_levels,