diff --git a/tests/r/r3.6-rspm/runtime.txt b/tests/r/r3.6-rspm/runtime.txt
index 009200f3..b43a0768 100644
--- a/tests/r/r3.6-rspm/runtime.txt
+++ b/tests/r/r3.6-rspm/runtime.txt
@@ -1 +1 @@
-r-3.6-2018-11-20
+r-3.6-2018-12-20