diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7fa39c3..e09e5de 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -9,11 +9,16 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        group:
+          - Core
+        version:
+          - '1'
+          - '1.6'
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
-        with:
-          version: 1
       - uses: actions/cache@v1
         env:
           cache-name: cache-artifacts
diff --git a/Project.toml b/Project.toml
index faf6c25..1ab106f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -21,7 +21,7 @@ Latexify = "0.14, 0.15"
 ModelingToolkit = "7"
 Reexport = "0.2, 1.0"
 SciMLBase = "1.3"
-julia = "1.3"
+julia = "1.6"
 
 [extras]
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"