diff --git a/kokoro/macos/php7.0_mac/build.sh b/kokoro/macos/php7.0_mac/build.sh
index e5a37e30ee..c6717e071b 100755
--- a/kokoro/macos/php7.0_mac/build.sh
+++ b/kokoro/macos/php7.0_mac/build.sh
@@ -8,4 +8,5 @@ cd $(dirname $0)/../../..
 # Prepare worker environment to run tests
 source kokoro/macos/prepare_build_macos_rc
 
-./tests.sh php7.0_mac
+# TODO(mkruskal) Re-enable this once we can get a working PHP 7.0 installed.
+#./tests.sh php7.0_mac
diff --git a/kokoro/macos/php7.3_mac/build.sh b/kokoro/macos/php7.3_mac/build.sh
index 2d2f679da2..2688ddbf65 100755
--- a/kokoro/macos/php7.3_mac/build.sh
+++ b/kokoro/macos/php7.3_mac/build.sh
@@ -8,4 +8,5 @@ cd $(dirname $0)/../../..
 # Prepare worker environment to run tests
 source kokoro/macos/prepare_build_macos_rc
 
-./tests.sh php7.3_mac
+# TODO(mkruskal) Re-enable this once we can get a working PHP 7.0 installed.
+#./tests.sh php7.3_mac
diff --git a/php/composer.json b/php/composer.json
index f712f0ebb9..756704f8fc 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -9,7 +9,7 @@
     "php": ">=7.0.0"
   },
   "require-dev": {
-    "phpunit/phpunit": ">=5.0.0"
+    "phpunit/phpunit": ">=5.0.0 <8.5.27"
   },
   "autoload": {
     "psr-4": {