diff --git a/Cargo.lock b/Cargo.lock
index 6b7882f..69d8593 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -96,6 +96,7 @@ dependencies = [
  "env_logger",
  "lazy_static",
  "log",
+ "mmap-append",
  "ron",
  "serde",
  "thiserror",
@@ -194,6 +195,15 @@ version = "2.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
 
+[[package]]
+name = "memmap2"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45fd3a57831bf88bc63f8cebc0cf956116276e97fef3966103e96416209f7c92"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.7.1"
@@ -214,6 +224,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "mmap-append"
+version = "0.1.0"
+source = "git+https://github.com/mikedilger/mmap-append?rev=0d20e193e7f13a442865a4a40a5da9a120e87411#0d20e193e7f13a442865a4a40a5da9a120e87411"
+dependencies = [
+ "libc",
+ "memmap2",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.16.0"
diff --git a/Cargo.toml b/Cargo.toml
index 9fff180..f863b93 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ edition = "2021"
 env_logger = "0.10"
 lazy_static = "1.4"
 log = "0.4"
+mmap-append = { git = "https://github.com/mikedilger/mmap-append", rev = "0d20e193e7f13a442865a4a40a5da9a120e87411" }
 ron = "0.8"
 serde = { version = "1.0", features = ["derive"] }
 thiserror = "1.0"