diff --git a/Gemfile.lock b/Gemfile.lock
index 831fc14..835b9c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -167,7 +167,8 @@ GEM
       rdf (~> 3.3)
       rexml (~> 3.2)
     redcarpet (3.6.0)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     scanf (1.0.0)
     shacl (0.4.1)
       json-ld (~> 3.3)
@@ -196,6 +197,7 @@ GEM
       net-http-persistent (~> 4.0, >= 4.0.2)
       rdf (~> 3.3)
     stringio (3.1.0)
+    strscan (3.1.0)
     sxp (1.3.0)
       matrix (~> 0.4)
       rdf (~> 3.3)