diff --git a/.travis.yml b/.travis.yml
index b079f4d..243de20 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,8 @@ language: bash
 services: docker
 
 env:
-  - IMAGE=sentry:9.1.2
-  - IMAGE=getsentry/sentry:git
+  - SENTRY_IMAGE=sentry:9.1.2
+  - SENTRY_IMAGE=getsentry/sentry:git
 
 script:
   - ./install.sh
diff --git a/Dockerfile b/Dockerfile
index bbd3044..50a59ea 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,2 +1,2 @@
-ARG IMAGE=sentry:9.1.2
-FROM ${IMAGE}-onbuild
+ARG SENTRY_IMAGE
+FROM ${SENTRY_IMAGE}-onbuild
diff --git a/docker-compose.yml b/docker-compose.yml
index bcc9cb4..20d688c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -13,7 +13,7 @@ x-defaults: &defaults
   build:
     context: .
     args:
-      IMAGE: ${IMAGE}
+      SENTRY_IMAGE: ${SENTRY_IMAGE}
   depends_on:
     - redis
     - postgres
diff --git a/install.sh b/install.sh
index c9fd564..d3af603 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -e
 
+LATEST_STABLE_SENTRY_IMAGE='sentry:9.1.2'
+
 MIN_DOCKER_VERSION='17.05.0'
 MIN_COMPOSE_VERSION='1.17.0'
 MIN_RAM=3072 # MB
@@ -55,6 +57,12 @@ else
   cp -n .env.example "$ENV_FILE"
 fi
 
+if [ -z $SENTRY_IMAGE ]; then
+  echo ""
+  echo "\$SENTRY_IMAGE not set, using latest stable: $LATEST_STABLE_SENTRY_IMAGE";
+  export SENTRY_IMAGE=$LATEST_STABLE_SENTRY_IMAGE
+fi
+
 echo ""
 echo "Building and tagging Docker images..."
 echo ""