diff --git a/.github/workflows/linux-upstream-zlib-ng.yml b/.github/workflows/linux-upstream-zlib-ng.yml
index 1f6aa4c..de55130 100644
--- a/.github/workflows/linux-upstream-zlib-ng.yml
+++ b/.github/workflows/linux-upstream-zlib-ng.yml
@@ -18,6 +18,7 @@ jobs:
           - latest
         zlib-version:
           - 'develop'
+          - '2.2.1'
           - '2.2.0'
           - '2.1.7'
           - '2.1.6'
diff --git a/.github/workflows/macos-upstream-zlib-ng.yml b/.github/workflows/macos-upstream-zlib-ng.yml
index 620094d..5b97751 100644
--- a/.github/workflows/macos-upstream-zlib-ng.yml
+++ b/.github/workflows/macos-upstream-zlib-ng.yml
@@ -18,6 +18,7 @@ jobs:
           - latest
         zlib-version:
           - 'develop'
+          - '2.2.1'
           - '2.2.0'
           - '2.1.7'
           - '2.1.6'
diff --git a/.github/workflows/windows-upstream-zlib-ng.yml b/.github/workflows/windows-upstream-zlib-ng.yml
index 2d1ff6a..c75a5a2 100644
--- a/.github/workflows/windows-upstream-zlib-ng.yml
+++ b/.github/workflows/windows-upstream-zlib-ng.yml
@@ -28,6 +28,7 @@ jobs:
           - latest
         zlib-version:
           - 'develop'
+          - '2.2.1'
           - '2.2.0'
           - '2.1.7'
           - '2.1.6'
diff --git a/t/01version.t b/t/01version.t
index 11f5abe..16f1386 100644
--- a/t/01version.t
+++ b/t/01version.t
@@ -75,6 +75,7 @@ SKIP:
             '2.1.6' => '1.3.0.zlib-ng',
             '2.1.7' => '1.3.1.zlib-ng',
             '2.2.0' => '1.3.1.zlib-ng',
+            '2.2.1' => '1.3.1.zlib-ng',
         );
 
         my $zv = Compress::Raw::Zlib::zlibng_version();