diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bb00b38..44a8c4c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
+          - '1.4'
           - '1.5'
+          - '1.6'
           - 'nightly'
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index 54bc6a9..6c0ae91 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,14 +1,14 @@
 name = "ThermoState"
 uuid = "e7b6519d-fdf7-4a33-b544-2b37a9c1234a"
 authors = ["Andres Riedemann"]
-version = "0.4.6"
+version = "0.4.7"
 
 [deps]
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [compat]
-Unitful = "^1.4.1"
-julia = "1.4.1"
+Unitful = "^1.4"
+julia = "^1.4"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"