diff --git a/.kokoro/build.bat b/.kokoro/build.bat
index ba3fdbc..5ff89c8 100644
--- a/.kokoro/build.bat
+++ b/.kokoro/build.bat
@@ -5,4 +5,12 @@ REM  * Merges run all non-acceptance tests for every library, and acceptance tes
 REM  * Nightlies run all acceptance tests for every library.
 REM Currently only runs tests on 2.5.1
 
-"C:\Program Files\Git\bin\bash.exe" github/google-auth-library-ruby/.kokoro/windows.sh
+SET url="https://raw.githubusercontent.com/googleapis/google-cloud-ruby/master/.kokoro/build.bat"
+
+SET "download=powershell -C Invoke-WebRequest -Uri %url% -OutFile master-build.bat"
+
+SET EXIT_STATUS=1
+
+%download% && master-build.bat && SET EXIT_STATUS=0
+
+EXIT %EXIT_STATUS%
diff --git a/.kokoro/continuous/windows.cfg b/.kokoro/continuous/windows.cfg
index 8a73e4e..ff953f8 100644
--- a/.kokoro/continuous/windows.cfg
+++ b/.kokoro/continuous/windows.cfg
@@ -1,3 +1,19 @@
 # Format: //devtools/kokoro/config/proto/build.proto
 
-build_file: "google-auth-library-ruby/.kokoro/build.bat"
+build_file: "google-auth-library-ruby/.kokoro/trampoline.bat"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/yoshi-ruby/windows"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/google-auth-library-ruby/.kokoro/build.bat"
+}
+
+env_vars: {
+    key: "REPO_DIR"
+    value: "google-auth-library-ruby"
+}
diff --git a/.kokoro/presubmit/windows.cfg b/.kokoro/presubmit/windows.cfg
index 8a73e4e..ff953f8 100644
--- a/.kokoro/presubmit/windows.cfg
+++ b/.kokoro/presubmit/windows.cfg
@@ -1,3 +1,19 @@
 # Format: //devtools/kokoro/config/proto/build.proto
 
-build_file: "google-auth-library-ruby/.kokoro/build.bat"
+build_file: "google-auth-library-ruby/.kokoro/trampoline.bat"
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/yoshi-ruby/windows"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/google-auth-library-ruby/.kokoro/build.bat"
+}
+
+env_vars: {
+    key: "REPO_DIR"
+    value: "google-auth-library-ruby"
+}
diff --git a/.kokoro/trampoline.bat b/.kokoro/trampoline.bat
new file mode 100644
index 0000000..1634b07
--- /dev/null
+++ b/.kokoro/trampoline.bat
@@ -0,0 +1,10 @@
+
+SET url="https://raw.githubusercontent.com/googleapis/google-cloud-ruby/master/.kokoro/trampoline.bat"
+
+SET "download=powershell -C Invoke-WebRequest -Uri %url% -OutFile master-trampoline.bat"
+
+SET EXIT_STATUS=1
+
+%download% && master-trampoline.bat && SET EXIT_STATUS=0
+
+EXIT %EXIT_STATUS%
diff --git a/.kokoro/windows.sh b/.kokoro/windows.sh
deleted file mode 100644
index 68b09f4..0000000
--- a/.kokoro/windows.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-script_url="https://raw.githubusercontent.com/googleapis/google-cloud-ruby/master/.kokoro/windows.sh"
-curl -o master-windows.sh $script_url && source master-windows.sh