diff --git a/Project.toml b/Project.toml
index ae12fad52..37ca0e046 100644
--- a/Project.toml
+++ b/Project.toml
@@ -51,6 +51,7 @@ Distributions = "0.23.8, 0.24, 0.25"
 Documenter = "0.27, 1"
 DynamicPPL = "0.22, 0.23, 0.24"
 Graphs = "1"
+JSON = "0.21"
 JuliaSyntax = "0.4"
 LogDensityProblems = "2"
 LogDensityProblemsAD = "1"