diff --git a/test/ppl/Project.toml b/test/ppl/Project.toml
index bdfa06f2..6d74ac3d 100644
--- a/test/ppl/Project.toml
+++ b/test/ppl/Project.toml
@@ -7,6 +7,6 @@ Turing = "fce5fe82-541a-59a6-adf8-730c64b5f9a0"
 [compat]
 Distributions = "0.24"
 SampleChainsDynamicHMC = "0.1"
-Soss = "0.18.2"
+Soss = "0.18.2, 0.19"
 Turing = "0.14, 0.15"
 julia = "1.5"