diff --git a/Gemfile b/Gemfile
index f5a0384..786272c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem "nanoc", "~> 4.12"
 # filters
 gem "nanoc-gzip.rb"
 gem "nanoc-webpack.rb"
-gem "nanoc-tidy.rb"
+gem "nanoc-tidy.rb", "~> 0.7"
 gem "rainpress", "~> 1.0"
 gem "sass", "~> 3.7"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 5a5c919..9b3fb05 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,7 +62,7 @@ GEM
       nanoc-core (~> 4.11, >= 4.11.15)
     nanoc-gzip.rb (0.2.3)
       nanoc (~> 4.12)
-    nanoc-tidy.rb (0.6.2)
+    nanoc-tidy.rb (0.7.0)
     nanoc-webpack.rb (0.10.1)
       ryo.rb (~> 0.5)
     nio4r (2.7.1)
@@ -151,7 +151,7 @@ DEPENDENCIES
   listen (~> 3.0)
   nanoc (~> 4.12)
   nanoc-gzip.rb
-  nanoc-tidy.rb
+  nanoc-tidy.rb (~> 0.7)
   nanoc-webpack.rb
   paint (~> 2.3)
   rainpress (~> 1.0)