diff --git a/manifests/dependencies/centos.pp b/manifests/dependencies/centos.pp
index 756e71b1..30212123 100644
--- a/manifests/dependencies/centos.pp
+++ b/manifests/dependencies/centos.pp
@@ -1,24 +1,6 @@
 # Install packages needed by RVM on RedHat systems when not using autolibs
 class rvm::dependencies::centos {
-  $version = $facts['os']['name'] ? {
-    'Amazon' => '6.x',
-    default  => $facts['os']['release']['full'],
-  }
-
-  case $version {
-    /^[67]\..*/: {
-      ensure_packages(['libcurl-devel'])
-    }
-    /^5\..*/: {
-      ensure_packages(['autoconf'])
-      ensure_packages(['curl-devel'])
-    }
-    default: {
-      ensure_packages(['curl-devel'])
-    }
-  }
-
   ensure_packages(['which','gcc','gcc-c++','make','gettext-devel','expat-devel','zlib-devel','openssl-devel',
       'perl','cpio','gettext-devel','wget','bzip2','libxml2','libxml2-devel','libxslt','libxslt-devel',
-  'readline-devel','patch','git','libyaml-devel','libffi-devel','libtool','bison'])
+  'readline-devel','patch','git','libyaml-devel','libffi-devel','libtool','bison', 'libcurl-devel'])
 }
diff --git a/manifests/passenger/dependencies/centos.pp b/manifests/passenger/dependencies/centos.pp
index 1f0b1dfe..9241dc07 100644
--- a/manifests/passenger/dependencies/centos.pp
+++ b/manifests/passenger/dependencies/centos.pp
@@ -1,16 +1,4 @@
 # Package dependencies for Passenger on RedHat
 class rvm::passenger::dependencies::centos {
-  $version = $facts['os']['name'] ? {
-    'Amazon' => '6.x',
-    default  => $facts['os']['release']['full'],
-  }
-
-  case $version {
-    /^[67]\..*/: {
-      ensure_packages(['libcurl-devel'])
-    }
-    default: {
-      ensure_packages(['curl-devel'])
-    }
-  }
+  ensure_packages(['libcurl-devel'])
 }
diff --git a/metadata.json b/metadata.json
index a4c555c7..3e09cfd9 100644
--- a/metadata.json
+++ b/metadata.json
@@ -22,36 +22,24 @@
     {
       "operatingsystem": "RedHat",
       "operatingsystemrelease": [
-        "4",
-        "5",
-        "6",
         "7"
       ]
     },
     {
       "operatingsystem": "CentOS",
       "operatingsystemrelease": [
-        "4",
-        "5",
-        "6",
         "7"
       ]
     },
     {
       "operatingsystem": "OracleLinux",
       "operatingsystemrelease": [
-        "4",
-        "5",
-        "6",
         "7"
       ]
     },
     {
       "operatingsystem": "Scientific",
       "operatingsystemrelease": [
-        "4",
-        "5",
-        "6",
         "7"
       ]
     },
@@ -64,14 +52,15 @@
     {
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
-        "6",
-        "7"
+        "9",
+        "10"
       ]
     },
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "12.04"
+        "18.04",
+        "20.04"
       ]
     },
     {
@@ -115,7 +104,7 @@
   "requirements": [
     {
       "name": "puppet",
-      "version_requirement": ">=3.0.0"
+      "version_requirement": ">= 6.1.0 < 7.0.0"
     }
   ]
 }
diff --git a/spec/classes/dependencies_spec.rb b/spec/classes/dependencies_spec.rb
index 3ddd43c9..738869b1 100644
--- a/spec/classes/dependencies_spec.rb
+++ b/spec/classes/dependencies_spec.rb
@@ -14,18 +14,8 @@
         it { is_expected.to contain_package('which') }
         it { is_expected.to contain_package('gcc') }
         it { is_expected.not_to contain_package('build-essential') }
-        case os_facts[:operatingsystemmajrelease]
-        when '5'
-          if %w[CentOS RedHat].include? os_facts[:operatingsystem]
-            it { is_expected.to contain_package('autoconf') } # rubocop:disable RSpec/RepeatedExample
-            it { is_expected.to contain_package('curl-devel') }
-            it { is_expected.not_to contain_package('libcurl-devel') }
-          end
-        when '6', '7'
-          it { is_expected.to contain_package('libcurl-devel') }
-          it { is_expected.not_to contain_package('autoconf') }
-          it { is_expected.not_to contain_package('curl-devel') }
-        end
+        it { is_expected.to contain_package('libcurl-devel') }
+        it { is_expected.not_to contain_package('autoconf') }
       when 'Debian'
         it { is_expected.to contain_package('autoconf') } # rubocop:disable RSpec/RepeatedExample
         it { is_expected.to contain_package('build-essential') }