diff --git a/bci_tester/data.py b/bci_tester/data.py
index af2ce1ca..0f564002 100755
--- a/bci_tester/data.py
+++ b/bci_tester/data.py
@@ -30,7 +30,7 @@
 
 #: The operating system version as present in /etc/os-release & various other
 #: places
-OS_VERSION = os.getenv("OS_VERSION", "15.5")
+OS_VERSION = os.getenv("OS_VERSION", "15.6")
 
 # Allowed os versions for base (non lang/non-app) containers
 ALLOWED_BASE_OS_VERSIONS = (