diff --git a/Project.toml b/Project.toml
index 48c3b69..33868c0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -4,4 +4,4 @@ authors = ["Takafumi Arakaki <aka.tkf@gmail.com> and contributors"]
 version = "0.1.0"
 
 [compat]
-julia = "1.8"
+julia = "1.7"
diff --git a/README.md b/README.md
index 2175bdb..6d93724 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://tkf.github.io/ConcurrentCollections.jl/dev/)
 
 ConcurrentCollections.jl provides the following lock-free collections for Julia
-≥ 1.8:
+≥ 1.7:
 
 * [`DualLinkedConcurrentRingQueue`](https://tkf.github.io/ConcurrentCollections.jl/dev/#ConcurrentCollections.DualLinkedConcurrentRingQueue)
 * [`LinkedConcurrentRingQueue`](https://tkf.github.io/ConcurrentCollections.jl/dev/#ConcurrentCollections.LinkedConcurrentRingQueue)