diff --git a/tests/Dockerfile.ubuntu-12.04 b/tests/Dockerfile.ubuntu-12.04
index 40be740..d0c130c 100644
--- a/tests/Dockerfile.ubuntu-12.04
+++ b/tests/Dockerfile.ubuntu-12.04
@@ -1,4 +1,5 @@
 FROM ubuntu:12.04
+RUN apt-get update
 
 # Install Ansible
 RUN apt-get install -y software-properties-common python-software-properties git
diff --git a/tests/Dockerfile.ubuntu-14.04 b/tests/Dockerfile.ubuntu-14.04
index 1475a46..ca33287 100644
--- a/tests/Dockerfile.ubuntu-14.04
+++ b/tests/Dockerfile.ubuntu-14.04
@@ -1,4 +1,5 @@
 FROM ubuntu:14.04
+RUN apt-get update
 
 # Install Ansible
 RUN apt-get install -y software-properties-common git