diff --git a/core/generator/gapic-generator-typescript/baselines/asset/package.json b/core/generator/gapic-generator-typescript/baselines/asset/package.json
index 251aa6960537..41444a6da951 100644
--- a/core/generator/gapic-generator-typescript/baselines/asset/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/asset/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/bigquery-storage/package.json b/core/generator/gapic-generator-typescript/baselines/bigquery-storage/package.json
index 73bb82b533d2..f5f6bec168b9 100644
--- a/core/generator/gapic-generator-typescript/baselines/bigquery-storage/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/bigquery-storage/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/bigquery-v2/package.json b/core/generator/gapic-generator-typescript/baselines/bigquery-v2/package.json
index 38c992f743ab..81a0828db1f9 100644
--- a/core/generator/gapic-generator-typescript/baselines/bigquery-v2/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/bigquery-v2/package.json
@@ -41,7 +41,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -53,6 +53,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/compute/package.json b/core/generator/gapic-generator-typescript/baselines/compute/package.json
index 00d22a479f26..bf7e8601fecc 100644
--- a/core/generator/gapic-generator-typescript/baselines/compute/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/compute/package.json
@@ -36,7 +36,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -48,6 +48,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/deprecatedtest/package.json b/core/generator/gapic-generator-typescript/baselines/deprecatedtest/package.json
index 29378678ab7d..508c0544d9b8 100644
--- a/core/generator/gapic-generator-typescript/baselines/deprecatedtest/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/deprecatedtest/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/disable-packing-test/package.json b/core/generator/gapic-generator-typescript/baselines/disable-packing-test/package.json
index 105aa48f3147..d1c6b0a30545 100644
--- a/core/generator/gapic-generator-typescript/baselines/disable-packing-test/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/disable-packing-test/package.json
@@ -40,7 +40,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -52,6 +52,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/dlp/package.json b/core/generator/gapic-generator-typescript/baselines/dlp/package.json
index be9be4c88adc..201abd221c77 100644
--- a/core/generator/gapic-generator-typescript/baselines/dlp/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/dlp/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/duplicate_methods_test/package.json b/core/generator/gapic-generator-typescript/baselines/duplicate_methods_test/package.json
index 57ad6c96dcb7..76e0d480abdd 100644
--- a/core/generator/gapic-generator-typescript/baselines/duplicate_methods_test/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/duplicate_methods_test/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/kms/package.json b/core/generator/gapic-generator-typescript/baselines/kms/package.json
index 2132e5a3d8c7..9fa63b0d7053 100644
--- a/core/generator/gapic-generator-typescript/baselines/kms/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/kms/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/logging/package.json b/core/generator/gapic-generator-typescript/baselines/logging/package.json
index 028fee184e4c..a561dffabc29 100644
--- a/core/generator/gapic-generator-typescript/baselines/logging/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/logging/package.json
@@ -37,7 +37,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -49,6 +49,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/monitoring/package.json b/core/generator/gapic-generator-typescript/baselines/monitoring/package.json
index 056f84b195b2..bafd826b887a 100644
--- a/core/generator/gapic-generator-typescript/baselines/monitoring/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/monitoring/package.json
@@ -40,7 +40,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -52,6 +52,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/naming/package.json b/core/generator/gapic-generator-typescript/baselines/naming/package.json
index c66adb5be7cd..63132d85192e 100644
--- a/core/generator/gapic-generator-typescript/baselines/naming/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/naming/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/redis/package.json b/core/generator/gapic-generator-typescript/baselines/redis/package.json
index 9eecc48216c6..da95d926c9c2 100644
--- a/core/generator/gapic-generator-typescript/baselines/redis/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/redis/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/retail/package.json b/core/generator/gapic-generator-typescript/baselines/retail/package.json
index 46a8ae9fbd9d..6e34a9d2e3f9 100644
--- a/core/generator/gapic-generator-typescript/baselines/retail/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/retail/package.json
@@ -49,7 +49,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -61,6 +61,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/routingtest/package.json b/core/generator/gapic-generator-typescript/baselines/routingtest/package.json
index 58d481c6f358..af80d4a896c8 100644
--- a/core/generator/gapic-generator-typescript/baselines/routingtest/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/routingtest/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/showcase-legacy/package.json b/core/generator/gapic-generator-typescript/baselines/showcase-legacy/package.json
index 2ebbe0ad5503..4c2c44470164 100644
--- a/core/generator/gapic-generator-typescript/baselines/showcase-legacy/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/showcase-legacy/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/showcase/package.json b/core/generator/gapic-generator-typescript/baselines/showcase/package.json
index 105aa48f3147..d1c6b0a30545 100644
--- a/core/generator/gapic-generator-typescript/baselines/showcase/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/showcase/package.json
@@ -40,7 +40,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -52,6 +52,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/tasks/package.json b/core/generator/gapic-generator-typescript/baselines/tasks/package.json
index 75202b879126..03a2743e50bc 100644
--- a/core/generator/gapic-generator-typescript/baselines/tasks/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/tasks/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/texttospeech/package.json b/core/generator/gapic-generator-typescript/baselines/texttospeech/package.json
index 04d75b7142d8..25c31b806142 100644
--- a/core/generator/gapic-generator-typescript/baselines/texttospeech/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/texttospeech/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/translate/package.json b/core/generator/gapic-generator-typescript/baselines/translate/package.json
index 89e4f01646ee..ac6d37f3a43a 100644
--- a/core/generator/gapic-generator-typescript/baselines/translate/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/translate/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/baselines/videointelligence/package.json b/core/generator/gapic-generator-typescript/baselines/videointelligence/package.json
index c9bb1f5c24bf..54d4a119a627 100644
--- a/core/generator/gapic-generator-typescript/baselines/videointelligence/package.json
+++ b/core/generator/gapic-generator-typescript/baselines/videointelligence/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",
diff --git a/core/generator/gapic-generator-typescript/templates/cjs/typescript_gapic/package.json b/core/generator/gapic-generator-typescript/templates/cjs/typescript_gapic/package.json
index 0a812fb93bcc..37fd46a21f90 100644
--- a/core/generator/gapic-generator-typescript/templates/cjs/typescript_gapic/package.json
+++ b/core/generator/gapic-generator-typescript/templates/cjs/typescript_gapic/package.json
@@ -35,7 +35,7 @@
     "test": "c8 mocha --config ../../.mocharc.cjs build/test"
   },
   "dependencies": {
-    "google-gax": "^5.1.1-rc.1"
+    "google-gax": "^5.0.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
@@ -47,6 +47,7 @@
     "jsdoc": "^4.0.5",
     "jsdoc-fresh": "^5.0.2",
     "jsdoc-region-tag": "^4.0.1",
+    "long": "^5.3.2",
     "mocha": "^11.7.4",
     "pack-n-play": "^4.2.1",
     "typescript": "5.8.3",