diff --git a/packages/database-postgres/package.json b/packages/database-postgres/package.json
index 95e9e54..5205781 100644
--- a/packages/database-postgres/package.json
+++ b/packages/database-postgres/package.json
@@ -9,11 +9,11 @@
     "typecheck": "tsc -p tsconfig.json --noEmit"
   },
   "dependencies": {
-    "kysely": "0.29.5",
-    "pg": "8.23.0"
+    "kysely": "0.29.4",
+    "pg": "8.22.0"
   },
   "devDependencies": {
-    "@types/pg": "8.23.1"
+    "@types/pg": "8.21.0"
   },
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6630a77..dbef49b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -25,26 +25,26 @@ importers:
   packages/database-postgres:
     dependencies:
       kysely:
-        specifier: 0.29.5
-        version: 0.29.5
+        specifier: 0.29.4
+        version: 0.29.4
       pg:
-        specifier: 8.23.0
-        version: 8.23.0
+        specifier: 8.22.0
+        version: 8.22.0
     devDependencies:
       '@types/pg':
-        specifier: 8.23.1
-        version: 8.23.1
+        specifier: 8.21.0
+        version: 8.21.0
 
 packages:
 
   '@types/node@24.13.3':
     resolution: {integrity: sha512-Dh8vAsV36ig5wa9OX4pXvMc9D3Veibfw2wix0CUwYODLD8nkj9UsLjASr49nPg+2eKzxhBV+v7L8pXvT4e639Q==}
 
-  '@types/pg@8.23.1':
-    resolution: {integrity: sha512-fKVHpikPdg4GKks3JuLEhvwSyvwzF23hnabPy6DD8ljVbC7+6J5dQzdv4arV6jqq57djnMgs1HKBxX4P8aBI3A==}
+  '@types/pg@8.21.0':
+    resolution: {integrity: sha512-AYdtudzabjLZgVgRZmAnU8bAnVUXzuJX2IYHeSIiIHm68olD+LgQYCGWdtcNYnP0uq9c4S4NibVG3Ni7VbKW7Q==}
 
-  kysely@0.29.5:
-    resolution: {integrity: sha512-ooa+eSbBNPTo3MycPEuW5jdrxQdQwdtB3LC3h43FiXQbIry5tR0C5lDG7eealK0E4D7XjrnOP5DIUg/LyjRMYQ==}
+  kysely@0.29.4:
+    resolution: {integrity: sha512-y5mVgQNkMbs1eK9Xyc0pmNdabN2wHhRYY/5r4W5HrUT1rYCEPeVNSj1RUJeSDKT3U0p+mXCvLgkrFuIafYI6BA==}
     engines: {node: '>=22.0.0'}
 
   pg-cloudflare@1.4.0:
@@ -69,8 +69,8 @@ packages:
     resolution: {integrity: sha512-qTAAlrEsl8s4OiEQY69wDvcMIdQN6wdz5ojQiOy6YRMuynxenON0O5oCpJI6lshc6scgAY8qvJ2On/p+CXY0GA==}
     engines: {node: '>=4'}
 
-  pg@8.23.0:
-    resolution: {integrity: sha512-Ip2EQCngowJLGOfCwkFhPXU7/ljlhn6Rxlmy4XYfL2Y+vyRM59+8uR2xqRWKdYmbXmxCFOAmKxBuSUCdF34qLg==}
+  pg@8.22.0:
+    resolution: {integrity: sha512-8wih1vVIBMxoUM2oB4soJsD9tDnDpLv4OXBJ+EJzFsvycD+lfyIreC2gGHq78f8jbLLt+bvlPTFdFZfJkOuzAA==}
     engines: {node: '>= 16.0.0'}
     peerDependencies:
       pg-native: '>=3.0.1'
@@ -119,13 +119,13 @@ snapshots:
     dependencies:
       undici-types: 7.18.2
 
-  '@types/pg@8.23.1':
+  '@types/pg@8.21.0':
     dependencies:
       '@types/node': 24.13.3
       pg-protocol: 1.16.0
       pg-types: 2.2.0
 
-  kysely@0.29.5: {}
+  kysely@0.29.4: {}
 
   pg-cloudflare@1.4.0:
     optional: true
@@ -134,9 +134,9 @@ snapshots:
 
   pg-int8@1.0.1: {}
 
-  pg-pool@3.14.0(pg@8.23.0):
+  pg-pool@3.14.0(pg@8.22.0):
     dependencies:
-      pg: 8.23.0
+      pg: 8.22.0
 
   pg-protocol@1.16.0: {}
 
@@ -148,10 +148,10 @@ snapshots:
       postgres-date: 1.0.7
       postgres-interval: 1.2.0
 
-  pg@8.23.0:
+  pg@8.22.0:
     dependencies:
       pg-connection-string: 2.14.0
-      pg-pool: 3.14.0(pg@8.23.0)
+      pg-pool: 3.14.0(pg@8.22.0)
       pg-protocol: 1.16.0
       pg-types: 2.2.0
       pgpass: 1.0.5
diff --git a/tests/database-postgres-imports.test.mjs b/tests/database-postgres-imports.test.mjs
index 1117f67..b857c8a 100644
--- a/tests/database-postgres-imports.test.mjs
+++ b/tests/database-postgres-imports.test.mjs
@@ -370,9 +370,12 @@ test('packages/database-postgres exists, is the driver owner, and its source imp
   assert.equal(manifest.name, '@personal-blog/database-postgres');
   // The driver is owned here: exact pins, never ranges (reproducibility,
   // same policy as typescript@6.0.3 at the root).
-  assert.equal(manifest.dependencies?.pg, '8.23.0', 'owner must pin pg exactly');
-  assert.equal(manifest.dependencies?.kysely, '0.29.5', 'owner must pin kysely exactly');
-  assert.equal(manifest.devDependencies?.['@types/pg'], '8.23.1', 'owner must pin @types/pg exactly');
+  // Golden tuple (Technology-Stack §5.2 / §7): pg 8.22.0, Kysely 0.29.4.
+  // @types/pg has no 8.22.x release; 8.21.0 is the closest published match
+  // (types for the immediately preceding pg minor).
+  assert.equal(manifest.dependencies?.pg, '8.22.0', 'owner must pin pg exactly');
+  assert.equal(manifest.dependencies?.kysely, '0.29.4', 'owner must pin kysely exactly');
+  assert.equal(manifest.devDependencies?.['@types/pg'], '8.21.0', 'owner must pin @types/pg exactly');
 
   // The boundary module really imports the driver — the isolation is
   // exercised, not just declared.