diff --git a/__snapshots__/generic-toml.js b/__snapshots__/generic-toml.js
index 85d9d09bc..6bed582be 100644
--- a/__snapshots__/generic-toml.js
+++ b/__snapshots__/generic-toml.js
@@ -67,3 +67,25 @@ x86-64-dep = { version = "1.2.3", registry = "private", path = ".." }
 foobar-dep = "1.2.3"
 
 `
+
+exports['GenericToml updateContent updates matching entry with TOML v1.0.0 spec 1'] = `
+[package]
+version = "2.3.4"
+
+[v1spec]
+# taken from toml.io#Arrays examples
+integers = [ 1, 2, 3 ]
+colors = [ "red", "yellow", "green" ]
+nested_arrays_of_ints = [ [ 1, 2 ], [3, 4, 5] ]
+nested_mixed_array = [ [ 1, 2 ], ["a", "b", "c"] ]
+string_array = [ "all", 'strings', """are the same""", '''type''' ]
+
+[heterogenous]
+# Mixed-type arrays are allowed
+numbers = [ 0.1, 0.2, 0.5, 1, 2, 5 ]
+contributors = [
+  "Foo Bar <foo@example.com>",
+  { name = "Baz Qux", email = "bazqux@example.com", url = "https://example.com/bazqux" }
+]
+
+`
diff --git a/package.json b/package.json
index 6572fc56c..afe11c17e 100644
--- a/package.json
+++ b/package.json
@@ -69,7 +69,7 @@
   "dependencies": {
     "@conventional-commits/parser": "^0.4.1",
     "@google-automations/git-file-utils": "^1.2.5",
-    "@iarna/toml": "^2.2.5",
+    "@iarna/toml": "^3.0.0",
     "@lerna/collect-updates": "^6.4.1",
     "@lerna/package": "^6.4.1",
     "@lerna/package-graph": "^6.4.1",
diff --git a/test/updaters/fixtures/toml/v1.0.0.toml b/test/updaters/fixtures/toml/v1.0.0.toml
new file mode 100644
index 000000000..4f51715d5
--- /dev/null
+++ b/test/updaters/fixtures/toml/v1.0.0.toml
@@ -0,0 +1,18 @@
+[package]
+version = '1.0.0'
+
+[v1spec]
+# taken from toml.io#Arrays examples
+integers = [ 1, 2, 3 ]
+colors = [ "red", "yellow", "green" ]
+nested_arrays_of_ints = [ [ 1, 2 ], [3, 4, 5] ]
+nested_mixed_array = [ [ 1, 2 ], ["a", "b", "c"] ]
+string_array = [ "all", 'strings', """are the same""", '''type''' ]
+
+[heterogenous]
+# Mixed-type arrays are allowed
+numbers = [ 0.1, 0.2, 0.5, 1, 2, 5 ]
+contributors = [
+  "Foo Bar <foo@example.com>",
+  { name = "Baz Qux", email = "bazqux@example.com", url = "https://example.com/bazqux" }
+]
diff --git a/test/updaters/generic-toml.ts b/test/updaters/generic-toml.ts
index 389bd0b83..dfb895ca7 100644
--- a/test/updaters/generic-toml.ts
+++ b/test/updaters/generic-toml.ts
@@ -76,5 +76,18 @@ describe('GenericToml', () => {
       const newContent = updater.updateContent(oldContent);
       expect(newContent).to.eql(oldContent);
     });
+    it('updates matching entry with TOML v1.0.0 spec', async () => {
+      const oldContent = readFileSync(
+        resolve(fixturesPath, './toml/v1.0.0.toml'),
+        'utf8'
+      ).replace(/\r\n/g, '\n');
+      const updater = new GenericToml(
+        '$.package.version',
+        Version.parse('v2.3.4')
+      );
+      const newContent = updater.updateContent(oldContent);
+      expect(newContent).not.to.eql(oldContent);
+      snapshot(newContent);
+    });
   });
 });