diff --git a/regex-cli/Cargo.toml b/regex-cli/Cargo.toml
index a107c09df..ac69c9ec4 100644
--- a/regex-cli/Cargo.toml
+++ b/regex-cli/Cargo.toml
@@ -27,7 +27,7 @@ anyhow = "1.0.28"
 bstr = { version = "1.4.0", default-features = false, features = ["std"] }
 lexopt = "0.3.0"
 log = { version = "0.4.17", features = ["std"] }
-memmap2 = "0.5.10"
+memmap2 = "0.9.4"
 regex = { version = "1.9.0", path = ".." }
 regex-automata = { version = "0.4.0", path = "../regex-automata", features = ["logging"] }
 regex-lite = { version = "0.1.0", path = "../regex-lite" }