diff --git a/build.sh b/build.sh
index 830b2dc..3832d43 100644
--- a/build.sh
+++ b/build.sh
@@ -2,5 +2,6 @@
 export PATH="${jre}/bin:${coreutils}/bin:${graphviz}/bin:${asciidoctor_revealjs}/bin"
 
 ${asciidoctor}/bin/asciidoctor -r asciidoctor-diagram -o ${out}/page.html ${src}/slides.adoc
-asciidoctor-revealjs -a revealjsdir=https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.7.0 -r asciidoctor-diagram -o ${out}/slides.html --trace ${src}/slides.adoc
+asciidoctor-revealjs -r asciidoctor-diagram -o ${out}/slides.html --trace ${src}/slides.adoc
+cp -r ${revealjs} ${out}/reveal.js
 
diff --git a/default.nix b/default.nix
index 4a1246e..6c40e0a 100644
--- a/default.nix
+++ b/default.nix
@@ -7,11 +7,18 @@ let
     gemdir = ./.;
   };
 
+  revealjs = fetchFromGitHub {
+    owner = "hakimel";
+    repo = "reveal.js";
+    rev = "3.7.0";
+    sha256 = "1raqacq2c6rcbqkli1jygw68nqs090zm59zrbdvflk6y1mzk93nd";
+  };
+
 in derivation {
   name = "kafetech-fai";
   builder = "${bash}/bin/bash";
   args = [ ./build.sh ];
-  inherit asciidoctor asciidoctor_revealjs coreutils jre graphviz;
+  inherit asciidoctor asciidoctor_revealjs coreutils jre graphviz revealjs;
   src = ./src;
   system = builtins.currentSystem;
 }