diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 75786cb..64bf7af 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,6 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
+          - '1.9'
           - '1.10'
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index 6039591..451430e 100644
--- a/Project.toml
+++ b/Project.toml
@@ -36,13 +36,13 @@ MLJModelInterface = "1.8.0"
 MLUtils = "0.4"
 Optimisers = "0.2, 0.3"
 ProgressMeter = "1.7.2"
-Random = "1.10"
+Random = "1.9, 1.10"
 Statistics = "1"
 Tables = "1.10.1"
-Test = "1.10"
+Test = "1.9, 1.10"
 Tullio = "0.3.5"
 Zygote = "0.6"
-julia = "1.10"
+julia = "1.9, 1.10"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"