diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fa7bb06..9893239 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,11 +7,12 @@ jobs:
   build:
     strategy:
       matrix:
-        ruby_version: ["3.4", "3.3"]
+        ruby_version: ["4.0", "3.3"]
+        postgres_version: ["18", "15"]
     runs-on: ubuntu-latest
     services:
       postgres:
-        image: postgres:17
+        image: postgres:${{ matrix.postgres_version }}
         env:
           # Default database that is created when the image is first started.
           POSTGRES_DB: active_record_collation_test
diff --git a/lib/active_record/collation/schema_statements.rb b/lib/active_record/collation/schema_statements.rb
index 649d67b..c266e77 100644
--- a/lib/active_record/collation/schema_statements.rb
+++ b/lib/active_record/collation/schema_statements.rb
@@ -18,14 +18,31 @@ def drop_collation(name)
       end
 
       def collations
-        internal_exec_query(<<~SQL, 'SCHEMA')
-          SELECT
-            pg_collation.collname,
-            pg_collation.colllocale
-          FROM pg_collation
-          JOIN pg_namespace
-          ON pg_collation.collnamespace = pg_namespace.oid AND pg_namespace.nspname = 'public'
-        SQL
+        internal_exec_query(collations_sql, 'SCHEMA')
+      end
+
+      private
+
+      def collations_sql # rubocop:disable Metrics/MethodLength
+        if database_version >= 170_000
+          <<~SQL
+            SELECT
+              pg_collation.collname,
+              pg_collation.colllocale
+            FROM pg_collation
+            JOIN pg_namespace
+            ON pg_collation.collnamespace = pg_namespace.oid AND pg_namespace.nspname = 'public'
+          SQL
+        else
+          <<~SQL
+            SELECT
+              pg_collation.collname,
+              pg_collation.colliculocale AS colllocale
+            FROM pg_collation
+            JOIN pg_namespace
+            ON pg_collation.collnamespace = pg_namespace.oid AND pg_namespace.nspname = 'public'
+          SQL
+        end
       end
     end
   end
diff --git a/test/dummy/db/schema.rb b/test/dummy/db/schema.rb
index e3c5d98..4aeed5a 100644
--- a/test/dummy/db/schema.rb
+++ b/test/dummy/db/schema.rb
@@ -14,8 +14,8 @@
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
-  create_collation("natural_de", "de-u-ka-shifted-kn-ks-level1-kv-symbol")
-  create_collation("natural_en", "en-u-ka-shifted-kn-ks-level1-kv-symbol")
+  create_collation("natural_de", "de-u-kn-true-ks-level1-ka-shifted-kv-symbol")
+  create_collation("natural_en", "en-u-kn-true-ks-level1-ka-shifted-kv-symbol")
 
   create_table "clients", force: :cascade do |t|
     t.text "name", null: false