diff --git a/Gemfile.lock b/Gemfile.lock
index 0dff483..e7161d9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -161,8 +161,7 @@ GEM
     rdf-xsd (3.3.0)
       rdf (~> 3.3)
       rexml (~> 3.2)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     scanf (1.0.0)
     shacl (0.4.1)
       json-ld (~> 3.3)
@@ -191,7 +190,6 @@ 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)