diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9e0f7b1..043c3d7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.4' # 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'.
+          - '1.6' # 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' # Leave this line unchanged. '1' will automatically expand to the latest stable 1.x release of Julia.
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index ee1a539..4c9a1ad 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "OpenQuantumTools"
 uuid = "e429f160-8886-11e9-20cb-0dbe84e78965"
 authors = ["Huo Chen <neversakura@hotmail.com>"]
-version = "0.6.2"
+version = "0.6.3"
 
 [deps]
 DiffEqBase = "2b5f629d-d688-5b77-993f-72d75c75574e"
@@ -17,7 +17,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 DiffEqBase = "6.0.0"
 DiffEqCallbacks = "2.0.0"
 DocStringExtensions = "0.7, 0.8"
-OpenQuantumBase = "0.6.1"
+OpenQuantumBase = "0.6.4"
 RecipesBase = "1.0.0"
 Reexport = "0.2.0, 1.0"
 julia = "1.4"