diff --git a/.ci.yaml b/.ci.yaml
index f988074e78ec..d0b4e46cd6eb 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -189,6 +189,16 @@ targets:
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 2"
 
+  - name: Linux_web web_dart_unit_test_shard_3 master
+    bringup: true
+    recipe: packages/packages
+    timeout: 60
+    properties:
+      target_file: web_dart_unit_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 2 --shardCount 3"
+
   - name: Linux_web web_dart_unit_test_shard_1 stable
     recipe: packages/packages
     timeout: 60
@@ -207,7 +217,20 @@ targets:
       version_file: flutter_stable.version
       package_sharding: "--shardIndex 1 --shardCount 2"
 
+  - name: Linux_web web_dart_unit_test_shard_3 stable
+    bringup: true
+    recipe: packages/packages
+    timeout: 60
+    properties:
+      target_file: web_dart_unit_tests.yaml
+      channel: stable
+      version_file: flutter_stable.version
+      package_sharding: "--shardIndex 2 --shardCount 3"
+
   # Wasm unit tests in master
+  # TODO(stuartmorgan): Switch to testing wasm on master and stable and non-wasm
+  # only on master if/when wasm builds become the default on stable; see
+  # https://github.com/flutter/flutter/issues/188813
   - name: Linux_web web_dart_unit_test_wasm_shard_1 master
     recipe: packages/packages
     timeout: 60