diff --git a/Gemfile b/Gemfile
index b64455f7..bdf4e4d5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,6 +58,7 @@ gem 'addressable', '2.9.0'
 # Adding this removes some deprecation warnings, caused by double-loading of the net-protocol library
 # (see https://github.com/ruby/net-imap/issues/16). We *might* be able to remove this after upgrading to Ruby 3
 gem 'net-http'
+gem 'net-imap', '>= 0.5.14'
 gem 'prometheus-client'
 gem 'psych', '< 4'
 gem 'net-protocol'
diff --git a/Gemfile.lock b/Gemfile.lock
index 03edb600..5ba41328 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,7 +111,7 @@ GEM
       bigdecimal
       rexml
     crass (1.0.6)
-    date (3.4.1)
+    date (3.5.1)
     derailed (0.1.0)
       derailed_benchmarks
     derailed_benchmarks (2.2.1)
@@ -207,7 +207,7 @@ GEM
     mutex_m (0.3.0)
     net-http (0.6.0)
       uri
-    net-imap (0.5.7)
+    net-imap (0.5.14)
       date
       net-protocol
     net-pop (0.1.2)
@@ -447,6 +447,7 @@ DEPENDENCIES
   minitest-retry
   mocha (~> 2.7)
   net-http
+  net-imap (>= 0.5.14)
   net-protocol
   nokogiri (= 1.19.1)
   parallel_tests