diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7169789..aa62fef 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,8 +15,7 @@ jobs:
       matrix:
         version:
           - '1.7' # Replace this with the minimum Julia version that your package supports. E.g. if your package requires Julia 1.5 or higher, change this to '1.5'.
-          - '1.9' # Replace this with the minimum Julia version that your package supports. E.g. if your package requires Julia 1.5 or higher, change this to '1.5'.
-          #- '1' # automatically expands to the latest stable 1.x release of Julia        
+          - '1' # automatically expands to the latest stable 1.x release of Julia        
           #  - 'nightly'
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index 363102c..da14dd1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -34,7 +34,7 @@ LabelledArrays = "1.6.1"
 NLopt = "0.6"
 NaNMath = "1"
 NodeJS = "2"
-OrdinaryDiffEq = "6"
+OrdinaryDiffEq = "6.0 - 6.55"
 ProgressMeter = "1"
 RecipesBase = "1"
 RecursiveArrayTools = "2"