diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bbcff657..311f2c4a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,5 @@
 ---
 name: ci
-
 "on":
   pull_request:
   push:
@@ -34,12 +33,10 @@ jobs:
           - "ubuntu-2004"
           - "ubuntu-2204"
         suite:
-          - "access-11"
           - "access-12"
           - "access-13"
           - "access-14"
           - "access-15"
-          - "client-install-11"
           - "client-install-12"
           - "client-install-13"
           - "client-install-14"
@@ -53,7 +50,6 @@ jobs:
           - "ident-14"
           - "ident-15"
           - "initdb-locale-15"
-          - "server-install-11"
           - "server-install-12"
           - "server-install-13"
           - "server-install-14"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18de135b..801ed115 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ This file is used to list changes made in the last 3 major versions of the postg
 
 ## Unreleased
 
+- Modify installed_postgresql_package_source to get highest PG version from packages
+- Remove PG11 suites from kitchen & CI due to upstream removal
+
 ## 11.9.0 - *2024-01-05*
 
 ## 11.8.5 - *2023-12-18*
diff --git a/kitchen.yml b/kitchen.yml
index 702d00c2..5959eb87 100644
--- a/kitchen.yml
+++ b/kitchen.yml
@@ -320,73 +320,3 @@ suites:
         pg_ver: "12"
     run_list:
       - recipe[test::server_install]
-
-  - name: access_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/access/
-    run_list:
-      - recipe[test::access]
-  - name: client_install_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/client_install/
-      inputs:
-        pg_ver: "11"
-    run_list:
-      - recipe[test::client_install]
-  - name: extension_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/extension/
-    run_list:
-      - recipe[test::extension]
-  - name: ident_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/ident/
-    run_list:
-      - recipe[test::ident]
-  - name: initdb_locale_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/initdb_locale/
-    run_list:
-      - recipe[test::initdb_locale]
-  - name: repo_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/repo/
-      inputs:
-        pg_ver: "11"
-    run_list:
-      - recipe[test::repository]
-  - name: server_install_11
-    attributes:
-      test:
-        pg_ver: "11"
-    verifier:
-      inspec_tests:
-        - path: test/integration/server_install/
-      inputs:
-        pg_ver: "11"
-    run_list:
-      - recipe[test::server_install]
diff --git a/libraries/helpers.rb b/libraries/helpers.rb
index b00337ec..152f08f2 100644
--- a/libraries/helpers.rb
+++ b/libraries/helpers.rb
@@ -23,12 +23,22 @@ module Cookbook
     module Helpers
       include Utils
 
-      def installed_postgresql_major_version
-        pgsql_package = node['packages'].filter { |p| p.match?(/^postgresql-?(\d+)?$/) }
+      def installed_postgresql_package_logic
+        pgsql_package = node['packages'].filter { |p| p.match?(/^postgresql-?(\d+)?$/) }.values
+
+        unless pgsql_package.one?
+          versions = pgsql_package.map { |values| values['version'] }.join(', ')
+          Chef::Log.warn("Detected #{pgsql_package.count} installed PostgreSQL versions: #{versions}. Using latest version.")
+          pgsql_package = [pgsql_package.max_by { |values| values['version'].to_f }]
+        end
 
         raise 'Unable to determine installed PostgreSQL version' if nil_or_empty?(pgsql_package)
 
-        pgsql_package = pgsql_package.values.first
+        pgsql_package.first
+      end
+
+      def installed_postgresql_major_version
+        pgsql_package = installed_postgresql_package_logic
         pgsql_package_version = pgsql_package.fetch('version').to_i
         pgsql_package_source = if pgsql_package.key?('release')
                                  pgsql_package.fetch('release').match?('PGDG') ? :repo : :os
@@ -42,11 +52,7 @@ def installed_postgresql_major_version
       end
 
       def installed_postgresql_package_source
-        pgsql_package = node['packages'].filter { |p| p.match?(/^postgresql-?(\d+)?$/) }
-
-        raise 'Unable to determine installed PostgreSQL version' if nil_or_empty?(pgsql_package)
-
-        pgsql_package = pgsql_package.values.first
+        pgsql_package = installed_postgresql_package_logic
         pgsql_package_version = pgsql_package.fetch('version').to_i
         pgsql_package_source = if pgsql_package.key?('release')
                                  pgsql_package.fetch('release').match?('PGDG') ? :repo : :os