diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2c06935..72a34ff 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -60,6 +60,15 @@ jobs:
                PG_CONFIG=/usr/lib/postgresql/${{ matrix.pg }}/bin/pg_config \
                PHP_CONFIG=php-config${{ matrix.php }} install
 
+      - name: Build and install hstore_plphp
+        run: |
+          make -C hstore_plphp \
+               PG_CONFIG=/usr/lib/postgresql/${{ matrix.pg }}/bin/pg_config \
+               PHP_CONFIG=php-config${{ matrix.php }}
+          sudo make -C hstore_plphp \
+               PG_CONFIG=/usr/lib/postgresql/${{ matrix.pg }}/bin/pg_config \
+               PHP_CONFIG=php-config${{ matrix.php }} install
+
       - name: Build and install bytea_plphp
         run: |
           make -C bytea_plphp \
@@ -92,6 +101,13 @@ jobs:
             make -C jsonb_plphp \
                  PG_CONFIG=/usr/lib/postgresql/${{ matrix.pg }}/bin/pg_config installcheck
 
+      - name: Run the hstore_plphp regression tests
+        run: |
+          port=$(pg_lsclusters | awk '$1 == "${{ matrix.pg }}" && $2 == "main" { print $3 }')
+          sudo -u postgres env PGPORT=$port \
+            make -C hstore_plphp \
+                 PG_CONFIG=/usr/lib/postgresql/${{ matrix.pg }}/bin/pg_config installcheck
+
       - name: Run the bytea_plphp regression tests
         run: |
           port=$(pg_lsclusters | awk '$1 == "${{ matrix.pg }}" && $2 == "main" { print $3 }')
@@ -104,6 +120,7 @@ jobs:
         run: |
           cat regression.diffs 2>/dev/null || true
           cat jsonb_plphp/regression.diffs 2>/dev/null || true
+          cat hstore_plphp/regression.diffs 2>/dev/null || true
           cat bytea_plphp/regression.diffs 2>/dev/null || true
 
   asan:
@@ -136,6 +153,10 @@ jobs:
                ASAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
           sudo make -C jsonb_plphp PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config PHP_CONFIG=php-config8.3 \
                ASAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer" install
+          make -C hstore_plphp PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config PHP_CONFIG=php-config8.3 \
+               ASAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
+          sudo make -C hstore_plphp PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config PHP_CONFIG=php-config8.3 \
+               ASAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer" install
           make -C bytea_plphp PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config PHP_CONFIG=php-config8.3 \
                ASAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer"
           sudo make -C bytea_plphp PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config PHP_CONFIG=php-config8.3 \
@@ -167,6 +188,9 @@ jobs:
           sudo -u postgres env PGPORT=$port \
             make -C jsonb_plphp \
                  PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config installcheck
+          sudo -u postgres env PGPORT=$port \
+            make -C hstore_plphp \
+                 PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config installcheck
           sudo -u postgres env PGPORT=$port \
             make -C bytea_plphp \
                  PG_CONFIG=/usr/lib/postgresql/18/bin/pg_config installcheck
@@ -178,4 +202,5 @@ jobs:
           sudo tail -50 /tmp/pg-asan.log 2>/dev/null || true
           cat regression.diffs 2>/dev/null || true
           cat jsonb_plphp/regression.diffs 2>/dev/null || true
+          cat hstore_plphp/regression.diffs 2>/dev/null || true
           cat bytea_plphp/regression.diffs 2>/dev/null || true
diff --git a/hstore_plphp/expected/hstore_plphp.out b/hstore_plphp/expected/hstore_plphp.out
index 00fc879..3358735 100644
--- a/hstore_plphp/expected/hstore_plphp.out
+++ b/hstore_plphp/expected/hstore_plphp.out
@@ -213,18 +213,9 @@ SELECT ht_via_spi();
  string
 (1 row)
 
+-- Tear down. The CASCADE notice lists dependent objects in a
+-- version-dependent way (how PostgreSQL records TRANSFORM dependencies has
+-- changed across releases), so silence it to keep the test output stable.
+SET client_min_messages = warning;
 DROP EXTENSION hstore_plphp CASCADE;
-NOTICE:  drop cascades to 13 other objects
-DETAIL:  drop cascades to function ht_classes(hstore)
-drop cascades to function ht_upcase(hstore)
-drop cascades to function ht_build(integer)
-drop cascades to function ht_merge(hstore,hstore)
-drop cascades to function ht_empty(hstore)
-drop cascades to function ht_bad()
-drop cascades to function ht_nested()
-drop cascades to function ht_normalize()
-drop cascades to function ht_field(ht_rec)
-drop cascades to function ht_make(integer)
-drop cascades to function ht_shatter(hstore)
-drop cascades to function ht_table(integer)
-drop cascades to function ht_via_spi()
+RESET client_min_messages;
diff --git a/hstore_plphp/sql/hstore_plphp.sql b/hstore_plphp/sql/hstore_plphp.sql
index 6bd60b6..9945405 100644
--- a/hstore_plphp/sql/hstore_plphp.sql
+++ b/hstore_plphp/sql/hstore_plphp.sql
@@ -148,4 +148,9 @@ TRANSFORM FOR TYPE hstore LANGUAGE plphp AS $$
 $$;
 SELECT ht_via_spi();
 
+-- Tear down. The CASCADE notice lists dependent objects in a
+-- version-dependent way (how PostgreSQL records TRANSFORM dependencies has
+-- changed across releases), so silence it to keep the test output stable.
+SET client_min_messages = warning;
 DROP EXTENSION hstore_plphp CASCADE;
+RESET client_min_messages;