diff --git a/.gitattributes b/.gitattributes
index 061da60..ab8c1eb 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,2 @@
 stubs/* linguist-documentation
+config.m4 linguist-detectable=false
diff --git a/.travis.yml b/.travis.yml
index b28008d..4e2a118 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-dist: xenial
+dist: bionic
 group: edge
 
 language: php
@@ -10,7 +10,7 @@ php:
 
 env:
   global:
-    - ARMA_VERSION="9.600.4"
+    - ARMA_VERSION="9.600.5"
     - ARMA_SRC="http://sourceforge.net/projects/arma/files/armadillo-${ARMA_VERSION}.tar.xz"
 
 before_install: