diff --git a/Gemfile b/Gemfile
index 66cce20560..b3a93d159e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -135,6 +135,10 @@ gem 'xapian-full-alaveteli', '~> 1.4.22.1'
 gem 'xml-simple', '~> 1.1.9', require: 'xmlsimple'
 gem 'zip_tricks', '~> 5.6.0'
 
+# Gems that are part of Ruby's standard library but need version constraints as
+# they are required by other Gem dependencies
+gem 'uri', '~> 1.0.2'
+
 # Gems only used by the research export task
 gem 'gender_detector', '~> 2.0.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 5072a62aac..2360ea0288 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -671,6 +671,7 @@ DEPENDENCIES
   uglifier (~> 4.2.1)
   unicode (~> 0.4.4)
   unidecoder (~> 1.1.0)
+  uri (~> 1.0.2)
   vpim (~> 24.2.20)
   web-console (>= 3.3.0)
   webmock (~> 3.24.0)