diff --git a/.travis.yml b/.travis.yml
index 67abdc2f..4c38c522 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ sudo: false
 language: php
 
 php: 
-  - "7.1"
+  - "7.3"
 
 cache:
   directories:
@@ -28,7 +28,7 @@ jobs:
       install:
         - composer install
       script:
-        - vendor/bin/phpunit
+        - ./vendor/bin/phpunit
     - # parallel
       install:
         - rm -f ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini
diff --git a/Dockerfile b/Dockerfile
index ff0b12f3..45a216b0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.10
+FROM alpine:3.11
 LABEL description="Download CardDAV VCards and upload as phonebook to AVM FRITZ!Box"
 
 VOLUME [ "/data" ]
diff --git a/README.md b/README.md
index 8c8308d9..ac70e244 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ an example file to the volume.
 
 There are two ways to use the image:
 
-    docker run --rm -v ./carddav2fb-config:/data andig/carddav2fb command...
+    docker run --rm -v $(pwd)/carddav2fb-config:/data andig/carddav2fb command...
 
 will execute a single command (and remove the created container
 afterwards).