diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index f5e4ada0d6..57d4625654 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -1309,7 +1309,7 @@ buildvariants:
       ruby: "ruby-3.2"
       mongodb-version: "7.0"
       topology: standalone
-    run_on: ubuntu2204
+      os: ubuntu2204
     display_name: DriverBench
     tasks:
       - name: "driver-bench"
diff --git a/.evergreen/config/standard.yml.erb b/.evergreen/config/standard.yml.erb
index 4941e1319b..7b91d4fac7 100644
--- a/.evergreen/config/standard.yml.erb
+++ b/.evergreen/config/standard.yml.erb
@@ -48,7 +48,7 @@ buildvariants:
       ruby: <%= latest_ruby %>
       mongodb-version: <%= latest_stable_mdb %>
       topology: standalone
-    run_on: ubuntu2204
+      os: ubuntu2204
     display_name: DriverBench
     tasks:
       - name: "driver-bench"
diff --git a/lib/mongo/version.rb b/lib/mongo/version.rb
index df2b2a7904..a78e0fa94b 100644
--- a/lib/mongo/version.rb
+++ b/lib/mongo/version.rb
@@ -16,5 +16,5 @@
 
 module Mongo
   # The current version of the driver.
-  VERSION = '2.20.1'
+  VERSION = '2.21.0'
 end