diff --git a/Dockerfile b/Dockerfile
index 6b072222c..95b5a1f3a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG GO_IMAGE=gcr.io/gcp-runtimes/go1-builder:1.13
+ARG GO_IMAGE=gcr.io/gcp-runtimes/go1-builder:1.15
 ARG RELEASE_IMAGE=scratch
 FROM ${GO_IMAGE} as builder
 
diff --git a/krm-functions/cloud-init/Dockerfile.sample b/krm-functions/cloud-init/Dockerfile.sample
index d114a6758..fb8018033 100644
--- a/krm-functions/cloud-init/Dockerfile.sample
+++ b/krm-functions/cloud-init/Dockerfile.sample
@@ -1,4 +1,4 @@
-FROM gcr.io/gcp-runtimes/go1-builder:1.13 as builder
+FROM gcr.io/gcp-runtimes/go1-builder:1.15 as builder
 ENV CGO_ENABLED=0
 WORKDIR /go/src/
 COPY image/go.mod .
diff --git a/krm-functions/replacement-transformer/Dockerfile.sample b/krm-functions/replacement-transformer/Dockerfile.sample
index d114a6758..fb8018033 100644
--- a/krm-functions/replacement-transformer/Dockerfile.sample
+++ b/krm-functions/replacement-transformer/Dockerfile.sample
@@ -1,4 +1,4 @@
-FROM gcr.io/gcp-runtimes/go1-builder:1.13 as builder
+FROM gcr.io/gcp-runtimes/go1-builder:1.15 as builder
 ENV CGO_ENABLED=0
 WORKDIR /go/src/
 COPY image/go.mod .
diff --git a/krm-functions/templater/Dockerfile.sample b/krm-functions/templater/Dockerfile.sample
index d114a6758..fb8018033 100644
--- a/krm-functions/templater/Dockerfile.sample
+++ b/krm-functions/templater/Dockerfile.sample
@@ -1,4 +1,4 @@
-FROM gcr.io/gcp-runtimes/go1-builder:1.13 as builder
+FROM gcr.io/gcp-runtimes/go1-builder:1.15 as builder
 ENV CGO_ENABLED=0
 WORKDIR /go/src/
 COPY image/go.mod .
diff --git a/krm-functions/toolbox/Dockerfile b/krm-functions/toolbox/Dockerfile
index 7f4a9302c..6ce5587b9 100644
--- a/krm-functions/toolbox/Dockerfile
+++ b/krm-functions/toolbox/Dockerfile
@@ -5,7 +5,7 @@ RUN curl -L "https://storage.googleapis.com/kubernetes-release/release/$(curl -s
       -o /kubectl
 RUN chmod +x /kubectl
 
-FROM gcr.io/gcp-runtimes/go1-builder:1.13 as builder
+FROM gcr.io/gcp-runtimes/go1-builder:1.15 as builder
 ENV CGO_ENABLED=0
 WORKDIR /go/src/
 COPY krm-functions/toolbox/image/go.mod .