diff --git a/CHANGELOG.md b/CHANGELOG.md
index 393c9ad..6013252 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres
 to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.0.1] - 2021-05-19
+
+### Changed
+
+- bump `@seald-io/binary-search-tree` to 1.0.2, which does not depend
+  on `underscore`;
+- replace use of `underscore` by pure JS.
+
 ## [2.0.0] - 2021-05-18
 
 This version should be a drop-in replacement for `nedb@1.8.0` provided you use
@@ -13,6 +21,7 @@ modern browsers / versions of Node.js since ES6 features are now used (such
 as `class` and `const` / `let`).
 
 ### Changed
+
 - Update `homepage` & `repository` fields in the `package.json`
 - New maintainer [seald](https://github.com/seald/) and new package
   name [@seald-io/nedb](https://www.npmjs.com/package/@seald-io/nedb);
diff --git a/package-lock.json b/package-lock.json
index 1b3fc1f..b06234a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "2.0.0",
       "license": "MIT",
       "dependencies": {
-        "@seald-io/binary-search-tree": "^1.0.0",
+        "@seald-io/binary-search-tree": "^1.0.2",
         "async": "0.2.10",
         "localforage": "^1.9.0"
       },
@@ -189,12 +189,9 @@
       }
     },
     "node_modules/@seald-io/binary-search-tree": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@seald-io/binary-search-tree/-/binary-search-tree-1.0.0.tgz",
-      "integrity": "sha512-gSI4pDoTxDAS1cA0u8hmHi7WRMW8Osm/qTQrUGOjsYvqGqhebsg+v4jWmg3fqO5f+2eJvXnv8OJRh0pdwx2wwg==",
-      "dependencies": {
-        "underscore": "^1.13.1"
-      }
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@seald-io/binary-search-tree/-/binary-search-tree-1.0.2.tgz",
+      "integrity": "sha512-+pYGvPFAk7wUR+ONMOlc6A+LUN4kOCFwyPLjyaeS7wVibADPHWYJNYsNtyIAwjF1AXQkuaXElnIc4XjKt55QZA=="
     },
     "node_modules/@types/component-emitter": {
       "version": "1.2.10",
@@ -5135,11 +5132,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/underscore": {
-      "version": "1.13.1",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.1.tgz",
-      "integrity": "sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g=="
-    },
     "node_modules/universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
@@ -5860,12 +5852,9 @@
       }
     },
     "@seald-io/binary-search-tree": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@seald-io/binary-search-tree/-/binary-search-tree-1.0.0.tgz",
-      "integrity": "sha512-gSI4pDoTxDAS1cA0u8hmHi7WRMW8Osm/qTQrUGOjsYvqGqhebsg+v4jWmg3fqO5f+2eJvXnv8OJRh0pdwx2wwg==",
-      "requires": {
-        "underscore": "^1.13.1"
-      }
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@seald-io/binary-search-tree/-/binary-search-tree-1.0.2.tgz",
+      "integrity": "sha512-+pYGvPFAk7wUR+ONMOlc6A+LUN4kOCFwyPLjyaeS7wVibADPHWYJNYsNtyIAwjF1AXQkuaXElnIc4XjKt55QZA=="
     },
     "@types/component-emitter": {
       "version": "1.2.10",
@@ -9617,11 +9606,6 @@
         "which-boxed-primitive": "^1.0.2"
       }
     },
-    "underscore": {
-      "version": "1.13.1",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.1.tgz",
-      "integrity": "sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g=="
-    },
     "universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
diff --git a/package.json b/package.json
index 97185bd..a6e4ee5 100755
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "url": "git@github.com:seald/nedb.git"
   },
   "dependencies": {
-    "@seald-io/binary-search-tree": "^1.0.0",
+    "@seald-io/binary-search-tree": "^1.0.2",
     "async": "0.2.10",
     "localforage": "^1.9.0"
   },