diff --git a/Gemfile b/Gemfile
index abbbae3..da4e411 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem "nanoc", "~> 4.12"
 # filters
 gem "nanoc-gzip.rb"
 gem "nanoc-webpack.rb", "~> 0.10.4"
-gem "nanoc-tidy.rb", "~> 0.8.2"
+gem "nanoc-tidy.rb", "~> 0.8.4"
 gem "rainpress", "~> 1.0"
 gem "sass", "~> 3.7"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index e030b6e..8df4312 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,9 +62,9 @@ GEM
       nanoc-core (~> 4.11, >= 4.11.15)
     nanoc-gzip.rb (0.2.3)
       nanoc (~> 4.12)
-    nanoc-tidy.rb (0.8.2)
+    nanoc-tidy.rb (0.8.4)
       ryo.rb (~> 0.5)
-      test-cmd.rb (~> 0.12.3)
+      test-cmd.rb (~> 0.12.4)
     nanoc-webpack.rb (0.10.4)
       ryo.rb (~> 0.5)
       test-cmd.rb (~> 0.12.3)
@@ -140,7 +140,7 @@ GEM
       rubocop-performance (~> 1.20.2)
     stringio (3.1.0)
     strscan (3.1.0)
-    test-cmd.rb (0.12.3)
+    test-cmd.rb (0.12.4)
     tty-color (0.6.0)
     tty-command (0.10.1)
       pastel (~> 0.8)
@@ -157,7 +157,7 @@ DEPENDENCIES
   listen (~> 3.0)
   nanoc (~> 4.12)
   nanoc-gzip.rb
-  nanoc-tidy.rb (~> 0.8.2)
+  nanoc-tidy.rb (~> 0.8.4)
   nanoc-webpack.rb (~> 0.10.4)
   paint (~> 2.3)
   rainpress (~> 1.0)