diff --git a/docker/release/centos7/Dockerfile b/docker/release/centos7/Dockerfile
index bd108f47f54..621d200a8ab 100644
--- a/docker/release/centos7/Dockerfile
+++ b/docker/release/centos7/Dockerfile
@@ -38,7 +38,8 @@ RUN curl https://packages.microsoft.com/config/rhel/7/prod.repo | tee /etc/yum.r
 
 # Install latest powershell from Microsoft YUM Repo
 RUN yum install -y \
-        powershell
+        powershell \
+    && yum clean all
 
 # Use PowerShell as the default shell
 # Use array to avoid Docker prepending /bin/sh -c
diff --git a/docker/release/fedora26/Dockerfile b/docker/release/fedora26/Dockerfile
index cbb96d74c1e..b955b06d175 100644
--- a/docker/release/fedora26/Dockerfile
+++ b/docker/release/fedora26/Dockerfile
@@ -37,7 +37,8 @@ RUN localedef --charmap=UTF-8 --inputfile=en_US $LANG
 RUN curl https://packages.microsoft.com/config/rhel/7/prod.repo | tee /etc/yum.repos.d/microsoft.repo
 
 # Install latest powershell from Microsoft YUM Repo
-RUN dnf install -y powershell
+RUN dnf install -y powershell \
+    && dnf clean all
 
 # Use array to avoid Docker prepending /bin/sh -c
 CMD [ "pwsh" ]
diff --git a/docker/release/fedora27/Dockerfile b/docker/release/fedora27/Dockerfile
index 43cd6e50df4..55afd8cc587 100644
--- a/docker/release/fedora27/Dockerfile
+++ b/docker/release/fedora27/Dockerfile
@@ -37,7 +37,8 @@ RUN localedef --charmap=UTF-8 --inputfile=en_US $LANG
 RUN curl https://packages.microsoft.com/config/rhel/7/prod.repo | tee /etc/yum.repos.d/microsoft.repo
 
 # Install latest powershell from Microsoft YUM Repo
-RUN dnf install -y powershell
+RUN dnf install -y powershell \
+    && dnf clean all
 
 # Use array to avoid Docker prepending /bin/sh -c
 CMD [ "pwsh" ]