diff --git a/.fixtures.yml b/.fixtures.yml
index d0ec0d9..e8a1576 100644
--- a/.fixtures.yml
+++ b/.fixtures.yml
@@ -3,6 +3,9 @@ fixtures:
     stdlib:
       repo: 'https://github.com/puppetlabs/puppetlabs-stdlib.git'
       ref: '4.6.0'
+    concat:
+      repo: 'https://github.com/puppetlabs/puppetlabs-concat.git'
+      ref: '2.2.1'
     common:
       repo: 'https://github.com/ghoneycutt/puppet-module-common.git'
       ref: 'v1.4.1'
diff --git a/metadata.json b/metadata.json
index e7cf559..0364a5b 100644
--- a/metadata.json
+++ b/metadata.json
@@ -88,6 +88,7 @@
   "description": "Manage SSH",
   "dependencies": [
     {"name":"puppetlabs/stdlib","version_requirement":">= 4.6.0 < 6.0.0"},
+    {"name":"puppetlabs/concat","version_requirement":">= 2.0.0 < 3.0.0"},
     {"name":"ghoneycutt/common","version_requirement":">= 1.4.1 < 2.0.0"},
     {"name":"puppetlabs/firewall","version_requirement":">= 1.9.0 < 2.0.0"}
   ]