diff --git a/Gemfile.lock b/Gemfile.lock
index 026532e..9bbc150 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,8 +7,8 @@ GEM
       minitest (>= 5.1)
       tzinfo (~> 2.0)
       zeitwerk (~> 2.3)
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     algolia (2.1.1)
       faraday (>= 0.15, < 2.0)
       multi_json (~> 1.0)
@@ -47,6 +47,9 @@ GEM
       rubyzip (~> 2.3)
       seven_zip_ruby (~> 1.0)
       thor (~> 1.0)
+    expressir (1.0.0)
+      rice (~> 3)
+      thor (~> 1.0)
     expressir (1.0.0-x86_64-darwin)
       thor (~> 1.0)
     extract_ttc (0.1.0)
@@ -80,6 +83,8 @@ GEM
       ffi (~> 1.0)
     ffi-libarchive-binary (0.2.4-x86_64-darwin)
       ffi-libarchive (~> 1.0)
+    ffi-libarchive-binary (0.2.4-x86_64-linux)
+      ffi-libarchive (~> 1.0)
     fontist (1.11.2)
       down (~> 5.0)
       excavate (~> 0.1)
@@ -295,6 +300,7 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0901)
+    mini_portile2 (2.5.3)
     minitest (5.14.4)
     mn2pdf (1.36)
     mnconvert (1.8.0)
@@ -303,6 +309,9 @@ GEM
     net-http-digest_auth (1.4.1)
     net-http-persistent (4.0.1)
       connection_pool (~> 2.2)
+    nokogiri (1.11.7)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     nokogiri (1.11.7-x86_64-darwin)
       racc (~> 1.4)
     nokogiri-styles (0.1.2)
@@ -319,7 +328,7 @@ GEM
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    public_suffix (4.0.6)
+    public_suffix (7.0.5)
     racc (1.5.2)
     rake (13.0.6)
     rchardet (1.8.0)
@@ -421,6 +430,7 @@ GEM
     reverse_markdown (1.4.0)
       nokogiri
     rexml (3.2.5)
+    rice (3.0.0)
     roman-numerals (0.3.0)
     rsec (1.0.0)
     ruby-graphviz (1.2.5)
@@ -475,6 +485,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   metanorma-cli