diff --git a/examples/0-intro-1d/Project.toml b/examples/0-intro-1d/Project.toml
index 0289dd6c..04a655c5 100644
--- a/examples/0-intro-1d/Project.toml
+++ b/examples/0-intro-1d/Project.toml
@@ -25,6 +25,6 @@ ForwardDiff = "0.10, 1"
 Literate = "2.5"
 LogDensityProblems = "2"
 LogDensityProblemsAD = "1"
-Optim = "1"
+Optim = "1, 2"
 Plots = "1"
 StatsFuns = "1"