diff --git a/Dockerfile b/Dockerfile
index 8222378..130ee22 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,15 +1,15 @@
-FROM alpine:3.14.3
+FROM alpine:3.15.4
 
-RUN apk add --no-cache \
-  curl \
-  bash \
-  git \
-  && rm -rf /var/cache/apk/*
+RUN apk update && apk --no-cache add bash curl git
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 RUN curl -sL https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv3.8.7/kustomize_v3.8.7_linux_amd64.tar.gz \
-  | tar xz -C /usr/local/bin 
+  | tar xz -C /usr/local/bin
+
+RUN git config --global --add safe.directory /github/workspace
+
+RUN rm -rf /var/cache/apk/*
 
 COPY kustdiff /kustdiff