diff --git a/.github/workflows/buildpack-integration-test.yml b/.github/workflows/buildpack-integration-test.yml
index e47f8cd..f9b1365 100644
--- a/.github/workflows/buildpack-integration-test.yml
+++ b/.github/workflows/buildpack-integration-test.yml
@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - master
+  pull_request:
   workflow_dispatch:
 
 # Declare default permissions as read only.
@@ -12,29 +13,32 @@ permissions: read-all
 
 jobs:
   go113-buildpack-test:
-    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.4
     with:
       http-builder-source: 'testdata/conformance/function'
       http-builder-target: 'declarativeHTTP'
       cloudevent-builder-source: 'testdata/conformance/function'
       cloudevent-builder-target: 'declarativeCloudEvent'
-      prerun: 'testdata/conformance/prerun.sh ${{ github.sha }} testdata/conformance/function'
+      prerun: 'testdata/conformance/prerun.sh ${{ github.event.pull_request.head.sha }} testdata/conformance/function'
       builder-runtime: 'go113'
+      builder-runtime-version: '1.13'
   go116-buildpack-test:
-    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.4
     with:
       http-builder-source: 'testdata/conformance/function'
       http-builder-target: 'declarativeHTTP'
       cloudevent-builder-source: 'testdata/conformance/function'
       cloudevent-builder-target: 'declarativeCloudEvent'
-      prerun: 'testdata/conformance/prerun.sh ${{ github.sha }} testdata/conformance/function'
+      prerun: 'testdata/conformance/prerun.sh ${{ github.event.pull_request.head.sha }} testdata/conformance/function'
       builder-runtime: 'go116'
+      builder-runtime-version: '1.16'
   non-declarative-buildpack-test:
-    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.0
+    uses: GoogleCloudPlatform/functions-framework-conformance/.github/workflows/buildpack-integration-test.yml@v1.8.4
     with:
       http-builder-source: 'testdata/conformance/nondeclarative'
       http-builder-target: 'HTTP'
       cloudevent-builder-source: 'testdata/conformance/nondeclarative'
       cloudevent-builder-target: 'CloudEvent'
-      prerun: 'testdata/conformance/prerun.sh ${{ github.sha }} testdata/conformance/nondeclarative'
-      builder-runtime: 'go116'
\ No newline at end of file
+      prerun: 'testdata/conformance/prerun.sh ${{ github.event.pull_request.head.sha }} testdata/conformance/nondeclarative'
+      builder-runtime: 'go116'
+      builder-runtime-version: '1.16'
\ No newline at end of file
diff --git a/testdata/conformance/prerun.sh b/testdata/conformance/prerun.sh
index 58b8268..4f713ee 100755
--- a/testdata/conformance/prerun.sh
+++ b/testdata/conformance/prerun.sh
@@ -14,16 +14,14 @@ TARGET_DIRECTORY=$2 # relative to repo root
 # exit when any command fails
 set -e
 
-if [ -z "${FRAMEWORK_VERSION}" ]
-    then
-        echo "Functions Framework version required as first parameter"
-        exit 1
+if [ -z "${FRAMEWORK_VERSION}" ]; then
+    echo "Functions Framework version required as first parameter"
+    exit 1
 fi
 
-if [ -z "${TARGET_DIRECTORY}" ]
-    then
-        echo "Target directory required as second parameter"
-        exit 1
+if [ -z "${TARGET_DIRECTORY}" ]; then
+    echo "Target directory required as second parameter"
+    exit 1
 fi
 
 cd $(dirname $0)
@@ -38,8 +36,11 @@ go 1.13
 
 require (
         cloud.google.com/go/functions v1.0.0
-        github.com/GoogleCloudPlatform/functions-framework-go $FRAMEWORK_VERSION
         github.com/cloudevents/sdk-go/v2 v2.6.1
-)" >> $TARGET_DIRECTORY/go.mod
+)" >>$TARGET_DIRECTORY/go.mod
 
-cat $TARGET_DIRECTORY/go.mod
+cd $TARGET_DIRECTORY
+
+go get github.com/GoogleCloudPlatform/functions-framework-go@$FRAMEWORK_VERSION
+
+cat go.mod