diff --git a/Dockerfile b/Dockerfile
index 0294640..3767da3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,10 +3,11 @@ LABEL Maintainer="Alex Skrypnyk <alex@integratedexperts.com>"
 
 # Install git and ssh.
 RUN apt-get update -qq \
-    && apt-get install -y git ssh zip unzip vim lynx curl aspell-en jq
+    && apt-get install -y git ssh lsof zip unzip vim lynx curl aspell-en jq
 
 RUN git --version \
     && ssh -V \
+    && lsof -v \
     && zip --version \
     && unzip -v \
     && vim --version \
diff --git a/README.md b/README.md
index e69c204..1601c4c 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ Docker image for CI Builder container
 
 It contains several tools required to run docker-based builds:
 - git
+- lsof
 - lynx
 - curl
 - vim
diff --git a/goss.yaml b/goss.yaml
index d50326b..98c1f80 100644
--- a/goss.yaml
+++ b/goss.yaml
@@ -154,3 +154,9 @@ command:
     stderr: []
     timeout: 10000
 
+  which lsof:
+    exit-status: 0
+    stdout:
+      - /usr/bin/lsof
+    stderr: []
+    timeout: 10000