diff --git a/.github/run-package-tests.sh b/.github/run-package-tests.sh
index e868e242d9e..489ce26317c 100644
--- a/.github/run-package-tests.sh
+++ b/.github/run-package-tests.sh
@@ -156,7 +156,6 @@ export -f run_package_test_parallel
 export STRICT
 export PREFER_LOWEST
 export FAILED_FILE
-export GRPC_ENABLE_FORK_SUPPORT=1
 
 # Determine optimal parallelism: default to the number of CPU cores on the host runner
 MAX_JOBS=${MAX_JOBS:-$(nproc 2>/dev/null || echo 8)}
diff --git a/.github/workflows/unit-tests.yaml b/.github/workflows/unit-tests.yaml
index 9fe52de968d..135b3e5da51 100644
--- a/.github/workflows/unit-tests.yaml
+++ b/.github/workflows/unit-tests.yaml
@@ -7,8 +7,6 @@ on:
 
 permissions:
   contents: read
-env:
-  GRPC_ENABLE_FORK_SUPPORT: 1
 
 jobs:
   test:
diff --git a/Auth/phpunit.xml.dist b/Auth/phpunit.xml.dist
index 415c4c85030..37f1e65a113 100644
--- a/Auth/phpunit.xml.dist
+++ b/Auth/phpunit.xml.dist
@@ -13,4 +13,7 @@
       <directory suffix="Test.php">tests</directory>
     </testsuite>
   </testsuites>
+  <php>
+    <env name="GRPC_ENABLE_FORK_SUPPORT" value="1"/>
+  </php>
 </phpunit>
diff --git a/Gax/composer.json b/Gax/composer.json
index 9e90d747eae..3d9607c015b 100644
--- a/Gax/composer.json
+++ b/Gax/composer.json
@@ -11,13 +11,13 @@
         "php": "^8.2",
         "google/auth": "^1.53",
         "google/grpc-gcp": "^0.4",
-        "grpc/grpc": "^1.13",
+        "grpc/grpc": "^1.38",
         "google/protobuf": "^4.31||^5.34",
         "guzzlehttp/promises": "^2.0.3||^3.0",
         "guzzlehttp/psr7": "^2.6.3||^3.0",
         "google/common-protos": "^4.9",
         "google/longrunning": "~0.4",
-        "ramsey/uuid": "^4.0"
+        "ramsey/uuid": "^4.2.3"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6",