diff --git a/Dockerfile b/Dockerfile
index f821310..674fd32 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,11 @@
-FROM debian:buster-slim
+FROM ubuntu:18.04
 
 ENV GITHUB_PAT ""
 ENV GITHUB_OWNER ""
 ENV GITHUB_REPOSITORY ""
 ENV RUNNER_WORKDIR "_work"
 ENV RUNNER_LABELS ""
+ENV AGENT_TOOLSDIRECTORY=/opt/hostedtoolcache
 
 RUN apt-get update \
     && apt-get install -y \
@@ -17,12 +18,16 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/* \
     && useradd -m github \
     && usermod -aG sudo github \
-    && echo "%sudo ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+    && echo "%sudo ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers \
+    && mkdir -p opt/hostedtoolcache
+
+RUN sudo chown github opt/hostedtoolcache/.
 
 USER github
+
 WORKDIR /home/github
 
-RUN GITHUB_RUNNER_VERSION=$(curl --silent "https://api.github.com/repos/actions/runner/releases/latest" | jq -r '.tag_name[1:]') \
+RUN   GITHUB_RUNNER_VERSION=$(curl --silent "https://api.github.com/repos/actions/runner/releases/latest" | jq -r '.tag_name[1:]') \
     && curl -Ls https://github.com/actions/runner/releases/download/v${GITHUB_RUNNER_VERSION}/actions-runner-linux-x64-${GITHUB_RUNNER_VERSION}.tar.gz | tar xz \
     && sudo ./bin/installdependencies.sh