diff --git a/docker-compose.yml b/docker-compose.yml
index 4dd98e5..9ca6ada 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -120,6 +120,7 @@ services:
           - INSTALL_SWOOLE=${WORKSPACE_INSTALL_SWOOLE}
           - INSTALL_TAINT=${WORKSPACE_INSTALL_TAINT}
           - INSTALL_LIBPNG=${WORKSPACE_INSTALL_LIBPNG}
+          - INSTALL_GRAPHVIZ=${WORKSPACE_INSTALL_GRAPHVIZ}
           - INSTALL_IONCUBE=${WORKSPACE_INSTALL_IONCUBE}
           - INSTALL_MYSQL_CLIENT=${WORKSPACE_INSTALL_MYSQL_CLIENT}
           - INSTALL_PING=${WORKSPACE_INSTALL_PING}
diff --git a/env-example b/env-example
index 3930bb8..4c78647 100644
--- a/env-example
+++ b/env-example
@@ -150,6 +150,7 @@ WORKSPACE_INSTALL_PHALCON=false
 WORKSPACE_INSTALL_SWOOLE=false
 WORKSPACE_INSTALL_TAINT=false
 WORKSPACE_INSTALL_LIBPNG=false
+WORKSPACE_INSTALL_GRAPHVIZ=false
 WORKSPACE_INSTALL_IONCUBE=false
 WORKSPACE_INSTALL_MYSQL_CLIENT=false
 WORKSPACE_INSTALL_PING=false
diff --git a/workspace/Dockerfile b/workspace/Dockerfile
index 5bee6cd..f2694c4 100644
--- a/workspace/Dockerfile
+++ b/workspace/Dockerfile
@@ -610,6 +610,17 @@ RUN if [ ${INSTALL_FSWATCH} = true ]; then \
 ;fi
 
 ###########################################################################
+
+# GraphViz extension
+###########################################################################
+
+ARG INSTALL_GRAPHVIZ=false
+
+RUN if [ ${INSTALL_GRAPHVIZ} = true ]; then \
+    apt-get update && \
+    apt-get install -y graphviz \
+;fi
+
 # IonCube Loader
 ###########################################################################