diff --git a/Gemfile.lock b/Gemfile.lock
index 1c8e84f..d8cbc84 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,12 +70,12 @@ GEM
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    nanoc (4.13.0)
+    nanoc (4.13.1)
       addressable (~> 2.5)
       colored (~> 1.2)
       nanoc-checking (~> 1.0, >= 1.0.2)
-      nanoc-cli (= 4.13.0)
-      nanoc-core (= 4.13.0)
+      nanoc-cli (= 4.13.1)
+      nanoc-core (= 4.13.1)
       nanoc-deploying (~> 1.0)
       parallel (~> 1.12)
       tty-command (~> 0.8)
@@ -83,13 +83,13 @@ GEM
     nanoc-checking (1.0.5)
       nanoc-cli (~> 4.12, >= 4.12.5)
       nanoc-core (~> 4.12, >= 4.12.5)
-    nanoc-cli (4.13.0)
+    nanoc-cli (4.13.1)
       cri (~> 2.15)
       diff-lcs (~> 1.3)
-      nanoc-core (= 4.13.0)
+      nanoc-core (= 4.13.1)
       pry
       zeitwerk (~> 2.1)
-    nanoc-core (4.13.0)
+    nanoc-core (4.13.1)
       base64 (~> 0.2)
       concurrent-ruby (~> 1.1)
       ddmetrics (~> 1.0)
@@ -97,7 +97,6 @@ GEM
       immutable-ruby (~> 0.1)
       json_schema (~> 0.19)
       memo_wise (~> 1.5)
-      psych (>= 4.0, < 6.0)
       slow_enumerator_tools (~> 1.0)
       tty-platform (~> 0.2)
       zeitwerk (~> 2.1)
@@ -115,8 +114,6 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     pstore (0.1.3)
-    psych (5.1.2)
-      stringio
     public_suffix (6.0.1)
     rake (13.2.1)
     rb-fsevent (0.11.2)
@@ -134,7 +131,6 @@ GEM
       rbtree
       set (~> 1.0)
     stringex (2.8.6)
-    stringio (3.1.1)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     tty-color (0.6.0)