diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/make.defaults b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/make.defaults
index 36dbf9e60d..aaf58deb7b 100644
--- a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/make.defaults
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/make.defaults
@@ -39,13 +39,6 @@ USE="${USE} seccomp"
 # Set SELinux policy
 POLICY_TYPES="targeted mcs mls"
 
-# Override upstream's python settings
-USE="$USE python_targets_python2_7 python_single_target_python2_7"
-USE="$USE -python_targets_python3_2 -python_single_target_python3_2"
-USE="$USE -python_targets_python3_3 -python_single_target_python3_3"
-BOOTSTRAP_USE="$BOOTSTRAP_USE -python_targets_python3_2"
-BOOTSTRAP_USE="$BOOTSTRAP_USE -python_targets_python3_3"
-
 # Disable packages or optional features with distribution issues.
 ACCEPT_RESTRICT="* -bindist -mirror"
 USE="${USE} bindist"
diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/use.mask b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/use.mask
index d7d483989a..bed2a39fb4 100644
--- a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/use.mask
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/use.mask
@@ -1 +1,10 @@
+# Never enable experimental code
 kdbus
+
+# Block python3 for now
+python_targets_python3_3
+python_targets_python3_4
+python_targets_python3_5
+python_single_target_python3_3
+python_single_target_python3_4
+python_single_target_python3_5