diff --git a/global/overlay/etc/puppet/cosmos_enc.py b/global/overlay/etc/puppet/cosmos_enc.py
index 131d161..852fb25 100755
--- a/global/overlay/etc/puppet/cosmos_enc.py
+++ b/global/overlay/etc/puppet/cosmos_enc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import yaml
@@ -14,5 +14,5 @@ if os.path.exists(db_file):
    with open(db_file) as fd:
       db.update(yaml.load(fd))
 
-print yaml.dump(dict(classes=db['classes'].get(node_name,dict()),parameters=dict(roles=db.get('members',[]))))
+print(yaml.dump(dict(classes=db['classes'].get(node_name,dict()),parameters=dict(roles=db.get('members',[])))))
 
diff --git a/global/post-tasks.d/018packages b/global/post-tasks.d/018packages
index 79c3348..ee1889f 100755
--- a/global/post-tasks.d/018packages
+++ b/global/post-tasks.d/018packages
@@ -6,7 +6,8 @@ CACHE_DIR=/var/cache/puppet-modules
 MODULES_DIR=${MODULES_DIR:=/etc/puppet/cosmos-modules}
 export GNUPGHOME=/etc/cosmos/gnupg
 
-python -c "import yaml" 2>/dev/null || apt-get -y install python-yaml
+# /etc/puppet/cosmos_enc.py needs the YAML module
+python3 -c "import yaml" 2>/dev/null || apt-get -y install python3-yaml
 
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