diff --git a/README.md b/README.md
index 251a0f8e3..9582baa02 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ bin/rails s
 
 ```
 
-Prerequisites for testing: install PhantomJS >= 2.0
+Prerequisites for testing: install PhantomJS >= 1.9.8
 
 Run the tests with:
 
@@ -62,4 +62,4 @@ Code published under AFFERO GPL v3 (see [LICENSE-AGPLv3.txt](LICENSE-AGPLv3.txt)
 
 ## Contributions
 
-See [CONTRIBUTING_EN.md](CONTRIBUTING_EN.md)
\ No newline at end of file
+See [CONTRIBUTING_EN.md](CONTRIBUTING_EN.md)
diff --git a/README_ES.md b/README_ES.md
index c3fd3cdff..654272d60 100644
--- a/README_ES.md
+++ b/README_ES.md
@@ -47,7 +47,7 @@ Para ejecutar la aplicación en local:
 bin/rails s
 ```
 
-Prerequisitos para los tests: tener instalado PhantomJS >= 2.0
+Prerequisitos para los tests: tener instalado PhantomJS >= 1.9.8
 
 Para ejecutar los tests: