diff --git a/Gemfile.lock b/Gemfile.lock
index e547e58ff..68ce31a95 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,12 +120,13 @@ GEM
     govuk_personalisation (0.11.2)
       plek (>= 1.9.0)
       rails (>= 6, < 8)
-    govuk_publishing_components (28.6.0)
+    govuk_publishing_components (28.7.1)
       govuk_app_config
       govuk_personalisation (>= 0.7.0)
       kramdown
       plek
-      rails (~> 6)
+      psych (>= 4)
+      rails (>= 6)
       rouge
       sprockets (< 4)
     govuk_schemas (4.3.0)
@@ -207,6 +208,8 @@ GEM
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
+    psych (4.0.3)
+      stringio
     public_suffix (4.0.6)
     puma (5.6.2)
       nio4r (~> 2.0)
@@ -336,6 +339,7 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     statsd-ruby (1.5.0)
+    stringio (3.0.1)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     thor (1.2.1)