diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d5f8d9e..dfe4b08 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -35,6 +35,8 @@ jobs:
     - run: ruby --version
     - run: ridk version
       if: matrix.os == 'windows-latest' && !startsWith(matrix.ruby, '2.3')
+    - name: Subprocess test
+      run: ruby test_subprocess.rb
     - name: OpenSSL version
       run: ruby -ropenssl -e 'puts OpenSSL::OPENSSL_LIBRARY_VERSION'
     - name: OpenSSL test
diff --git a/README.md b/README.md
index f7cd5f5..003c66f 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ This action currently supports these versions of MRI, JRuby and TruffleRuby:
 | Ruby | 2.3.0 - 2.3.8, 2.4.0 - 2.4.9, 2.5.0 - 2.5.7, 2.6.0 - 2.6.5, 2.7.0, head |
 | JRuby | 9.2.9.0 |
 | TruffleRuby | 19.3.0, 19.3.1, head |
-| Rubinius | 4.13 |
+| Rubinius | 4.14 |
 
 Note that Ruby 2.3 and the OpenSSL version it needs (1.0.2) are both end-of-life,
 which means Ruby 2.3 is unmaintained and considered insecure.
diff --git a/dist/index.js b/dist/index.js
index d447018..82105ba 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2163,7 +2163,7 @@ function getVersions(platform) {
 
   if (platform === 'ubuntu-18.04') {
     versions['rubinius'] = [
-      "4.13"
+      "4.14"
     ]
   }
 
@@ -5148,7 +5148,7 @@ const tc = __webpack_require__(533)
 const rubyBuilderVersions = __webpack_require__(156)
 const axios = __webpack_require__(53)
 
-const builderReleaseTag = 'builds-newer-openssl'
+const builderReleaseTag = 'builds-no-warn'
 const releasesURL = 'https://github.com/eregon/ruby-builder/releases'
 
 function getAvailableVersions(platform, engine) {
diff --git a/ruby-builder-versions.js b/ruby-builder-versions.js
index 3d4c182..fed14d0 100644
--- a/ruby-builder-versions.js
+++ b/ruby-builder-versions.js
@@ -19,7 +19,7 @@ export function getVersions(platform) {
 
   if (platform === 'ubuntu-18.04') {
     versions['rubinius'] = [
-      "4.13"
+      "4.14"
     ]
   }
 
diff --git a/ruby-builder.js b/ruby-builder.js
index 9f14e06..87b4861 100644
--- a/ruby-builder.js
+++ b/ruby-builder.js
@@ -6,7 +6,7 @@ const tc = require('@actions/tool-cache')
 const rubyBuilderVersions = require('./ruby-builder-versions')
 const axios = require('axios')
 
-const builderReleaseTag = 'builds-newer-openssl'
+const builderReleaseTag = 'builds-no-warn'
 const releasesURL = 'https://github.com/eregon/ruby-builder/releases'
 
 export function getAvailableVersions(platform, engine) {
diff --git a/test_subprocess.rb b/test_subprocess.rb
new file mode 100644
index 0000000..191f7d2
--- /dev/null
+++ b/test_subprocess.rb
@@ -0,0 +1,13 @@
+require 'rbconfig'
+require 'stringio'
+
+puts "CPPFLAGS: #{RbConfig::CONFIG["CPPFLAGS"]}"
+
+$stderr = StringIO.new
+begin
+  system RbConfig.ruby, "-e", "p :OK"
+  out = $stderr.string
+ensure
+  $stderr = STDERR
+end
+abort out unless out.empty?