diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 823db98a..cab4a3eb 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -25,7 +25,7 @@ jobs:
       matrix:
         version:
           - '1.10'
-          - '1.8'
+          - '1.9'
           # - 'nightly'
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index f4088d30..3951c367 100644
--- a/Project.toml
+++ b/Project.toml
@@ -49,7 +49,7 @@ Peaks = "0.4.0"
 Plots = "1.35.0"
 ProgressMeter = "1.7.2"
 Symbolics = "5.0.0"
-julia = "1.8.2"
+julia = "1.9"
 
 [extras]
 ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"