diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 40e5c09..a3eb839 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.0'
+          - '1.5'
           - '1.10'
         os:
           - ubuntu-latest
diff --git a/dev/pkg.jl b/dev/pkg.jl
index a6808e3..d89b450 100644
--- a/dev/pkg.jl
+++ b/dev/pkg.jl
@@ -7,7 +7,7 @@ t = Template(;
   dir = pwd(),
   user = "ohno",
   authors = ["Shuhei Ohno"],
-  julia = v"1",
+  julia = v"1.5.0",
   plugins = [
     ProjectFile(; version = v"0.0.1"),
     License(; name = "MIT"),