diff --git a/Gemfile.lock b/Gemfile.lock
index 05cc0fa..ff7e82f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,13 +2,13 @@ GEM
   remote: https://rubygems.org/
   specs:
     asciidoctor (2.0.10)
-    asciidoctor-diagram (1.5.18)
-      asciidoctor (>= 1.5.0, < 3.x)
-    asciidoctor-revealjs (2.0.0)
-      asciidoctor (>= 1.5.6, < 2.1)
+    asciidoctor-diagram (2.0.2)
+      asciidoctor (>= 1.5.7, < 3.x)
+    asciidoctor-revealjs (4.0.1)
+      asciidoctor (>= 2.0.0, < 3.0.0)
       concurrent-ruby (~> 1.0)
       thread_safe (~> 0.3.5)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     thread_safe (0.3.6)
 
 PLATFORMS
@@ -19,4 +19,4 @@ DEPENDENCIES
   asciidoctor-revealjs
 
 BUNDLED WITH
-   1.17.2
+   1.17.3
diff --git a/gemset.nix b/gemset.nix
index 9a1a271..abffd9f 100644
--- a/gemset.nix
+++ b/gemset.nix
@@ -15,10 +15,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "095ar1hj96mi9vxnjjdkj7yzc3lp4wjxh4qsijx9inqflbcw7x71";
+      sha256 = "1dah5jcjykvfvw17dzyyv1nn2h41csvmmvfihy97iq1b8gfiynk9";
       type = "gem";
     };
-    version = "1.5.18";
+    version = "2.0.2";
   };
   asciidoctor-revealjs = {
     dependencies = ["asciidoctor" "concurrent-ruby" "thread_safe"];
@@ -26,20 +26,20 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "16gk16ym30xyqhl8wphj4a9lz1zgv0m7bf9b0avxz2922l4hr091";
+      sha256 = "084aq9frv4irzgd9ab3xad9i0ml9lb58w0wvg76gnwwr51plbpp4";
       type = "gem";
     };
-    version = "2.0.0";
+    version = "4.0.1";
   };
   concurrent-ruby = {
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1x07r23s7836cpp5z9yrlbpljcxpax14yw4fy4bnp6crhr6x24an";
+      sha256 = "094387x4yasb797mv07cs3g6f08y56virc2rjcpb1k79rzaj3nhl";
       type = "gem";
     };
-    version = "1.1.5";
+    version = "1.1.6";
   };
   thread_safe = {
     groups = ["default"];