diff --git a/Gemfile b/Gemfile
index 883c0c3d1..7b9055a05 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,7 +17,7 @@ gem 'rolify'
 gem 'prawn-labels'
 gem 'spreadsheet'
 gem 'wicked_pdf'
-gem 'wkhtmltopdf-binary', '0.12.3.1'
+gem 'wkhtmltopdf-binary', '0.12.6.6'
 # newer versions of wkhtmltopdf seem to have shrunken fonts on Mac OS X
 
 # Front-end
diff --git a/Gemfile.lock b/Gemfile.lock
index c5684583c..210dc985e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -664,7 +664,7 @@ GEM
       railties (>= 3.0.7)
     wicked_pdf (2.6.3)
       activesupport
-    wkhtmltopdf-binary (0.12.3.1)
+    wkhtmltopdf-binary (0.12.6.6)
     xpath (3.2.0)
       nokogiri (~> 1.8)
     zeitwerk (2.6.6)
@@ -767,7 +767,7 @@ DEPENDENCIES
   whenever
   wicked
   wicked_pdf
-  wkhtmltopdf-binary (= 0.12.3.1)
+  wkhtmltopdf-binary (= 0.12.6.6)
 
 RUBY VERSION
    ruby 2.7.6p219