diff --git a/Gemfile b/Gemfile
index 3b9dbb8..820ac6c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,6 +18,7 @@ gem "decidim-idcat_mobil", "~> 0.3.0"
 
 gem "decidim-cdtb"
 
+gem "base64", "0.1.0"
 gem "bootsnap", "~> 1.3"
 gem "wicked_pdf", "~> 2.7.0"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 5a55c54..231ae57 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -296,7 +296,7 @@ GEM
       faraday_middleware (~> 1.0, >= 1.0.0.rc1)
       net-http-persistent (~> 4.0)
       nokogiri (~> 1, >= 1.10.8)
-    base64 (0.2.0)
+    base64 (0.1.0)
     batch-loader (1.5.0)
     bcrypt (3.1.20)
     better_html (1.0.16)
@@ -928,6 +928,7 @@ PLATFORMS
 
 DEPENDENCIES
   azure-storage-blob
+  base64 (= 0.1.0)
   bootsnap (~> 1.3)
   byebug (~> 11.0)
   daemons