diff --git a/envs/ma_gym/__init__.py b/envs/ma_gym/__init__.py
index 293e16a..aaa72e7 100755
--- a/envs/ma_gym/__init__.py
+++ b/envs/ma_gym/__init__.py
@@ -7,7 +7,7 @@
 
 # Register openai's environments as multi agent
 # This should be done before registering new environments
-env_specs = [env_spec for env_spec in envs.registry.all() if 'gym.envs' in env_spec.entry_point]
+env_specs = [env_spec for env_spec in envs.registry.values() if 'gym.envs' in env_spec.entry_point]
 for spec in env_specs:
     register(
         id='ma_' + spec.id,