diff --git a/.github/workflows/testkit.yml b/.github/workflows/testkit.yml
index 26a47ac4..fa721c6b 100644
--- a/.github/workflows/testkit.yml
+++ b/.github/workflows/testkit.yml
@@ -81,7 +81,7 @@ jobs:
 
       - name: Archive testkit artifacts
         if: failure()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: artifacts ${{ matrix.ruby[0] }}
           path: ${{ github.workspace }}/testkit/artifacts
diff --git a/Rakefile b/Rakefile
index 9ff3b22f..b388859b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -2,6 +2,7 @@
 
 require 'rubygems'
 require 'hoe'
+require 'stringio'
 
 Hoe.plugin :bundler
 Hoe.plugin :gemspec
@@ -46,7 +47,7 @@ end.spec 'neo4j-ruby-driver' do
     spec_extras[:platform] = 'java'
   else
     require_ruby_version '>= 3.1'
-    dependency 'async', '< 2.12'
+    dependency 'async', '< 2.13'
     dependency 'async-io', '>= 0'
     dependency 'connection_pool', '>= 0'
   end