diff --git a/Gemfile.lock b/Gemfile.lock
index 0be587ae..43e0d7ec 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,6 @@ GEM
   specs:
     ast (2.4.3)
     benchmark (0.5.0)
-    cgi (0.5.1)
     date (3.5.1)
     diff-lcs (1.6.2)
     docile (1.4.1)
@@ -19,11 +18,10 @@ GEM
       minitar (~> 0.12)
       numo-narray (~> 0.9.2.1)
       zlib (~> 3.2)
-    erb (4.0.4)
-      cgi (>= 0.3.3)
+    erb (6.0.4)
     iers (0.1.0)
     io-console (0.8.2)
-    irb (1.17.0)
+    irb (1.18.0)
       pp (>= 0.6.0)
       prism (>= 1.3.0)
       rdoc (>= 4.0.0)