diff --git a/.travis.yml b/.travis.yml
index f72ccef..a1fff2e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,6 @@ matrix:
     - julia: nightly
 
 script:
-  - julia -e 'using Pkg; Pkg.add("https://github.com/kalmarek/Groups.jl"); Pkg.build(); Pkg.test(coverage=true);'
+  - julia -e 'using Pkg; Pkg.add(PackageSpec(url="https://github.com/kalmarek/Groups.jl")); Pkg.build(); Pkg.test(coverage=true);'
 
 codecov: true
diff --git a/README.md b/README.md
index ca58bc0..22a223f 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.org/kalmarek/GroupRings.jl.svg?branch=master)](https://travis-ci.org/kalmarek/GroupRings.jl)
 [![codecov](https://codecov.io/gh/kalmarek/GroupRings.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/kalmarek/GroupRings.jl)
 
-Please have a look at [tests](https://github.com/kalmarek/GroupRings.jl/blob/master/test/runtests.jl) to see how to use this package. It depends on [AbstractAlgebra.jl](https://github.com/Nemocas/AbstractAlgebra.jl) and (optionally) [Groups.jl](https://github.com/kalmarek/Groups.jl)
+Please have a look at [tests](https://github.com/kalmarek/GroupRings.jl/blob/master/test/runtests.jl) to see how to use this package. It depends on [AbstractAlgebra.jl](https://github.com/Nemocas/AbstractAlgebra.jl) and optionally [Groups.jl](https://github.com/kalmarek/Groups.jl)
 
 For an example applications have a look at our papers:
 [1703.09680](https://arxiv.org/abs/1703.09680), [1712.07167](https://arxiv.org/abs/1712.07167) and [1812.03456](https://arxiv.org/abs/1812.03456).