diff --git a/rllab/mujoco_py/Gemfile.lock b/rllab/mujoco_py/Gemfile.lock
index 9847ad28..8e265f14 100644
--- a/rllab/mujoco_py/Gemfile.lock
+++ b/rllab/mujoco_py/Gemfile.lock
@@ -1,25 +1,26 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.1.8)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.1)
-      tzinfo (~> 1.1)
+    activesupport (6.1.7.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     coderay (1.1.0)
-    i18n (0.7.0)
-    json (1.8.1)
+    concurrent-ruby (1.1.10)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
     method_source (0.8.2)
-    minitest (5.5.1)
+    minitest (5.17.0)
     pry (0.10.1)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
     slop (3.6.0)
-    thread_safe (0.3.4)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby