diff --git a/Cargo.lock b/Cargo.lock
index 8e527ba..e85f6c4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,6 +17,17 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aes"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b169f7a6d4742236a0a00c541b845991d0ac43e546831af1249753ab4c3aa3a0"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+]
+
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -119,19 +130,24 @@ dependencies = [
 
 [[package]]
 name = "axoasset"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7dce2f189800bafe8322ef3a4d361ee7373bfc2f8fe052afda404230166dc45f"
+checksum = "5e05853b0d9abfab8e7532cad0d07ec396dd95c1a81926b49ab3cfa121a9d8d6"
 dependencies = [
  "camino",
+ "flate2",
  "image",
  "miette 7.2.0",
  "mime",
  "serde",
  "serde_json",
+ "tar",
  "thiserror",
  "url",
  "walkdir",
+ "xz2",
+ "zip",
+ "zstd 0.13.1",
 ]
 
 [[package]]
@@ -166,7 +182,7 @@ dependencies = [
 name = "axoupdater"
 version = "0.3.3"
 dependencies = [
- "axoasset 0.9.0",
+ "axoasset 0.9.1",
  "axoprocess",
  "camino",
  "gazenot",
@@ -183,10 +199,15 @@ dependencies = [
 name = "axoupdater-cli"
 version = "0.3.3"
 dependencies = [
+ "axoasset 0.9.1",
  "axocli",
+ "axoprocess",
  "axoupdater",
+ "camino",
  "clap",
  "miette 7.2.0",
+ "reqwest",
+ "temp-dir",
 ]
 
 [[package]]
@@ -231,6 +252,12 @@ version = "0.21.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c79fed4cdb43e993fcdadc7e58a09fd0e3e649c4436fa11da71c9f1f3ee7feb9"
 
+[[package]]
+name = "base64ct"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -243,6 +270,15 @@ version = "2.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.14.0"
@@ -267,6 +303,27 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
+[[package]]
+name = "bzip2"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bdb116a6ef3f6c3698828873ad02c3014b3c85cadb88496095628e3ef1e347f8"
+dependencies = [
+ "bzip2-sys",
+ "libc",
+]
+
+[[package]]
+name = "bzip2-sys"
+version = "0.1.11+1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "736a955f3fa7875102d57c82b8cac37ec45224a07fd32d58f9f7a186b6cd4cdc"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "camino"
 version = "1.1.6"
@@ -282,6 +339,7 @@ version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
+ "jobserver",
  "libc",
 ]
 
@@ -304,6 +362,16 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "cipher"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773f3b9af64447d2ce9850330c473515014aa235e6a783b02db81ff39e4a3dad"
+dependencies = [
+ "crypto-common",
+ "inout",
+]
+
 [[package]]
 name = "clap"
 version = "4.5.4"
@@ -369,6 +437,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -385,6 +459,15 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
 
+[[package]]
+name = "cpufeatures"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.3.2"
@@ -394,6 +477,42 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
+
+[[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
+[[package]]
+name = "deranged"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b42b6fa04a440b495c8b04d0e71b707c585f83cb9cb28cf8cd0d976c315e31b4"
+dependencies = [
+ "powerfmt",
+]
+
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+ "subtle",
+]
+
 [[package]]
 name = "dyn-clone"
 version = "1.0.16"
@@ -440,6 +559,18 @@ dependencies = [
  "instant",
 ]
 
+[[package]]
+name = "filetime"
+version = "0.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ee447700ac8aa0b2f2bd7bc4462ad686ba06baa6727ac149a2d6277f0d240fd"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "flate2"
 version = "1.0.28"
@@ -574,6 +705,16 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.12"
@@ -628,6 +769,15 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
 
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "homedir"
 version = "0.2.1"
@@ -770,6 +920,15 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "inout"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0c10553d664a4d0bcff9f4215d0aac67a639cc68ef660840afe309b807bc9f5"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.12"
@@ -797,6 +956,15 @@ version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
+[[package]]
+name = "jobserver"
+version = "0.1.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab46a6e9526ddef3ae7f787c06f0f2600639ba80ea3eade3d8e670a2230f51d6"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.66"
@@ -840,6 +1008,17 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
+[[package]]
+name = "lzma-sys"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fda04ab3764e6cde78b9974eec4f779acaba7c4e84b36eca3cf77c581b85d27"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.1"
@@ -958,6 +1137,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "num-conv"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+
 [[package]]
 name = "num-integer"
 version = "0.1.45"
@@ -1048,6 +1233,29 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "password-hash"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7676374caaee8a325c9e7a2ae557f216c5563a171d6997b0ef8a65af35147700"
+dependencies = [
+ "base64ct",
+ "rand_core",
+ "subtle",
+]
+
+[[package]]
+name = "pbkdf2"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83a0692ec44e4cf1ef28ca317f14f8f07da2d95ec3fa01f86e4467b725e60917"
+dependencies = [
+ "digest",
+ "hmac",
+ "password-hash",
+ "sha2",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
@@ -1086,6 +1294,18 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "pkg-config"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"
+
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.78"
@@ -1104,6 +1324,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -1329,6 +1555,28 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
+[[package]]
+name = "sha2"
+version = "0.10.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -1390,6 +1638,12 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
+[[package]]
+name = "subtle"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
+
 [[package]]
 name = "supports-color"
 version = "3.0.0"
@@ -1460,6 +1714,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "tar"
+version = "0.4.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b16afcea1f22891c49a00c751c7b63b2233284064f11a200fc624137c51e2ddb"
+dependencies = [
+ "filetime",
+ "libc",
+ "xattr",
+]
+
 [[package]]
 name = "temp-dir"
 version = "0.1.13"
@@ -1517,6 +1782,25 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8248b6521bb14bc45b4067159b9b6ad792e2d6d754d6c41fb50e29fefe38749"
+dependencies = [
+ "deranged",
+ "num-conv",
+ "powerfmt",
+ "serde",
+ "time-core",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef927ca75afb808a4d64dd374f00a2adf8d0fcff8e7b184af886c3c87ec4a3f3"
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
@@ -1656,6 +1940,12 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.14"
@@ -1719,6 +2009,12 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "walkdir"
 version = "2.4.0"
@@ -2060,3 +2356,90 @@ dependencies = [
  "thiserror",
  "windows",
 ]
+
+[[package]]
+name = "xattr"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da84f1a25939b27f6820d92aed108f83ff920fdf11a7b19366c27c4cda81d4f"
+dependencies = [
+ "libc",
+ "linux-raw-sys",
+ "rustix",
+]
+
+[[package]]
+name = "xz2"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388c44dc09d76f1536602ead6d325eb532f5c122f17782bd57fb47baeeb767e2"
+dependencies = [
+ "lzma-sys",
+]
+
+[[package]]
+name = "zip"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "760394e246e4c28189f19d488c058bf16f564016aefac5d32bb1f3b51d5e9261"
+dependencies = [
+ "aes",
+ "byteorder",
+ "bzip2",
+ "constant_time_eq",
+ "crc32fast",
+ "crossbeam-utils",
+ "flate2",
+ "hmac",
+ "pbkdf2",
+ "sha1",
+ "time",
+ "zstd 0.11.2+zstd.1.5.2",
+]
+
+[[package]]
+name = "zstd"
+version = "0.11.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20cc960326ece64f010d2d2107537f26dc589a6573a316bd5b1dba685fa5fde4"
+dependencies = [
+ "zstd-safe 5.0.2+zstd.1.5.2",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d789b1514203a1120ad2429eae43a7bd32b90976a7bb8a05f7ec02fa88cc23a"
+dependencies = [
+ "zstd-safe 7.1.0",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "5.0.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd99b45c6bc03a018c8b8a86025678c87e55526064e38f9df301989dce7ec0a"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.10+zstd.1.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c253a4914af5bafc8fa8c86ee400827e83cf6ec01195ec1f1ed8441bf00d65aa"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/axoupdater-cli/Cargo.toml b/axoupdater-cli/Cargo.toml
index 01e60da..b80f236 100644
--- a/axoupdater-cli/Cargo.toml
+++ b/axoupdater-cli/Cargo.toml
@@ -18,5 +18,17 @@ clap = { version = "4.5.4", features = ["derive"] }
 # errors
 miette = "7.2.0"
 
+[dev-dependencies]
+axoasset = { version = "0.9.1", default-features = false, features = [
+    "compression", "compression-tar", "compression-zip"
+] }
+axoprocess = "0.2.0"
+camino = { version = "1.1.6", features = ["serde1"] }
+reqwest = { version = ">=0.11.0", default-features = false, features = [
+    "blocking",
+    "rustls-tls",
+] }
+temp-dir = "0.1.13"
+
 [[bin]]
 name = "axoupdater"
diff --git a/axoupdater-cli/tests/integration.rs b/axoupdater-cli/tests/integration.rs
new file mode 100644
index 0000000..63f3a5a
--- /dev/null
+++ b/axoupdater-cli/tests/integration.rs
@@ -0,0 +1,236 @@
+use std::io::Read;
+
+use axoasset::LocalAsset;
+use axoprocess::Cmd;
+use camino::{Utf8Path, Utf8PathBuf};
+use temp_dir::TempDir;
+
+static BIN: &str = env!("CARGO_BIN_EXE_axoupdater");
+static RECEIPT_TEMPLATE: &str = r#"{"binaries":["axolotlsay"],"install_prefix":"INSTALL_PREFIX","provider":{"source":"cargo-dist","version":"0.11.1"},"source":{"app_name":"axolotlsay","name":"cargodisttest","owner":"mistydemeo","release_type":"github"},"version":"VERSION"}"#;
+
+// Handle aarch64 later
+fn triple() -> String {
+    match std::env::consts::OS {
+        "windows" => {
+            if std::env::consts::ARCH == "x86_64" {
+                "x86_64-pc-windows-msvc".to_owned()
+            } else {
+                "aarch64-pc-windows-msvc".to_owned()
+            }
+        }
+        "macos" => {
+            if std::env::consts::ARCH == "x86_64" {
+                "x86_64-apple-darwin".to_owned()
+            } else {
+                "aarch64-apple-darwin".to_owned()
+            }
+        }
+        "linux" => {
+            if std::env::consts::ARCH == "x86_64" {
+                "x86_64-unknown-linux-gnu".to_owned()
+            } else {
+                "aarch64-unknown-linux-gnu".to_owned()
+            }
+        }
+        _ => unimplemented!(),
+    }
+}
+
+fn axolotlsay_tarball_path(version: &str) -> String {
+    let triple = triple();
+    format!("https://github.com/mistydemeo/cargodisttest/releases/download/v{version}/axolotlsay-{triple}.tar.gz")
+}
+
+fn install_receipt(version: &str, prefix: &Utf8PathBuf) -> String {
+    RECEIPT_TEMPLATE
+        .replace("INSTALL_PREFIX", prefix.as_ref())
+        .replace("VERSION", version)
+}
+
+fn write_receipt(version: &str, prefix: &Utf8PathBuf) -> std::io::Result<()> {
+    let contents = install_receipt(version, prefix);
+    let receipt_name = prefix.join("axolotlsay-receipt.json");
+    LocalAsset::write_new(&contents, receipt_name).unwrap();
+
+    Ok(())
+}
+
+#[test]
+fn bails_out_with_default_name() {
+    let mut command = Cmd::new(BIN, "execute axoupdater");
+    command.check(false);
+    let result = command.output().unwrap();
+    assert!(!result.status.success());
+
+    let stderr_string = String::from_utf8(result.stderr).unwrap();
+    assert!(stderr_string.contains("App name calculated as `axoupdater'"));
+}
+
+// Performs an in-place upgrade from an old version to a newer one.
+// The process runs like so:
+// * Simulate an install of axolotlsay into a temporary directory
+// * Write an install receipt to that path
+// * Copy this repo's copy of axoupdater into the temporary directory in place of the one that axolotlsay once came with
+// * Run axoupdater
+// * Confirm that the new binary exists and is a newer version than the one we had before
+//
+// NOTE: axolotlsay 0.2.115 is a good base version to use because it contains a
+//       several noteworthy bugfixes in its installer.
+#[test]
+fn test_upgrade() -> std::io::Result<()> {
+    let tempdir = TempDir::new()?;
+    let bindir_path = &tempdir.path().join("bin");
+    let bindir = Utf8Path::from_path(bindir_path).unwrap();
+    std::fs::create_dir_all(bindir)?;
+
+    let base_version = "0.2.115";
+
+    let url = axolotlsay_tarball_path(base_version);
+
+    let mut response = reqwest::blocking::get(url)
+        .unwrap()
+        .error_for_status()
+        .unwrap();
+
+    let compressed_path =
+        Utf8PathBuf::from_path_buf(tempdir.path().join("axolotlsay.tar.gz")).unwrap();
+    let mut contents = vec![];
+    response.read_to_end(&mut contents)?;
+    std::fs::write(&compressed_path, contents)?;
+
+    // Write the receipt for the updater to use
+    write_receipt(base_version, &bindir.to_path_buf())?;
+
+    LocalAsset::untar_gz_all(&compressed_path, bindir).unwrap();
+
+    // Now install our copy of the updater instead of the one axolotlsay came with
+    let updater_path = bindir.join("axolotlsay-update");
+    std::fs::copy(BIN, &updater_path)?;
+
+    let mut updater = Cmd::new(&updater_path, "run updater");
+    updater.env("AXOUPDATER_CONFIG_PATH", bindir);
+    // We'll do that manually
+    updater.check(false);
+    let result = updater.output();
+    assert!(result.is_ok());
+
+    // Now let's check the version we just updated to
+    let new_axolotlsay_path = &bindir.join("axolotlsay");
+    assert!(new_axolotlsay_path.exists());
+    let mut new_axolotlsay = Cmd::new(new_axolotlsay_path, "version test");
+    new_axolotlsay.arg("--version");
+    let output = new_axolotlsay.output().unwrap();
+    let stderr_string = String::from_utf8(output.stdout).unwrap();
+    assert!(stderr_string.starts_with("axolotlsay "));
+    assert_ne!(stderr_string, format!("axolotlsay {}\n", base_version));
+
+    Ok(())
+}
+
+// A similar test to the one above, but it upgrades to a specific version
+// instead of whatever's latest.
+#[test]
+fn test_upgrade_to_specific_version() -> std::io::Result<()> {
+    let tempdir = TempDir::new()?;
+    let bindir_path = &tempdir.path().join("bin");
+    let bindir = Utf8Path::from_path(bindir_path).unwrap();
+    std::fs::create_dir_all(bindir)?;
+
+    let base_version = "0.2.115";
+    let target_version = "0.2.116";
+
+    let url = axolotlsay_tarball_path(base_version);
+
+    let mut response = reqwest::blocking::get(url)
+        .unwrap()
+        .error_for_status()
+        .unwrap();
+
+    let compressed_path =
+        Utf8PathBuf::from_path_buf(tempdir.path().join("axolotlsay.tar.gz")).unwrap();
+    let mut contents = vec![];
+    response.read_to_end(&mut contents)?;
+    std::fs::write(&compressed_path, contents)?;
+
+    // Write the receipt for the updater to use
+    write_receipt(base_version, &bindir.to_path_buf())?;
+
+    LocalAsset::untar_gz_all(&compressed_path, bindir).unwrap();
+
+    // Now install our copy of the updater instead of the one axolotlsay came with
+    let updater_path = bindir.join("axolotlsay-update");
+    std::fs::copy(BIN, &updater_path)?;
+
+    let mut updater = Cmd::new(&updater_path, "run updater");
+    updater.arg("--version").arg(target_version);
+    updater.env("AXOUPDATER_CONFIG_PATH", bindir);
+    // We'll do that manually
+    updater.check(false);
+    let result = updater.output();
+    assert!(result.is_ok());
+
+    // Now let's check the version we just updated to
+    let new_axolotlsay_path = &bindir.join("axolotlsay");
+    assert!(new_axolotlsay_path.exists());
+    let mut new_axolotlsay = Cmd::new(new_axolotlsay_path, "version test");
+    new_axolotlsay.arg("--version");
+    let output = new_axolotlsay.output().unwrap();
+    let stderr_string = String::from_utf8(output.stdout).unwrap();
+    assert_eq!(stderr_string, format!("axolotlsay {}\n", target_version));
+
+    Ok(())
+}
+
+// A similar test to the one above, but it actually downgrades to an older
+// version on request instead of upgrading.
+#[test]
+fn test_downgrade_to_specific_version() -> std::io::Result<()> {
+    let tempdir = TempDir::new()?;
+    let bindir_path = &tempdir.path().join("bin");
+    let bindir = Utf8Path::from_path(bindir_path).unwrap();
+    std::fs::create_dir_all(bindir)?;
+
+    let base_version = "0.2.116";
+    let target_version = "0.2.115";
+
+    let url = axolotlsay_tarball_path(base_version);
+
+    let mut response = reqwest::blocking::get(url)
+        .unwrap()
+        .error_for_status()
+        .unwrap();
+
+    let compressed_path =
+        Utf8PathBuf::from_path_buf(tempdir.path().join("axolotlsay.tar.gz")).unwrap();
+    let mut contents = vec![];
+    response.read_to_end(&mut contents)?;
+    std::fs::write(&compressed_path, contents)?;
+
+    // Write the receipt for the updater to use
+    write_receipt(base_version, &bindir.to_path_buf())?;
+
+    LocalAsset::untar_gz_all(&compressed_path, bindir).unwrap();
+
+    // Now install our copy of the updater instead of the one axolotlsay came with
+    let updater_path = bindir.join("axolotlsay-update");
+    std::fs::copy(BIN, &updater_path)?;
+
+    let mut updater = Cmd::new(&updater_path, "run updater");
+    updater.arg("--version").arg(target_version);
+    updater.env("AXOUPDATER_CONFIG_PATH", bindir);
+    // We'll do that manually
+    updater.check(false);
+    let result = updater.output();
+    assert!(result.is_ok());
+
+    // Now let's check the version we just updated to
+    let new_axolotlsay_path = &bindir.join("axolotlsay");
+    assert!(new_axolotlsay_path.exists());
+    let mut new_axolotlsay = Cmd::new(new_axolotlsay_path, "version test");
+    new_axolotlsay.arg("--version");
+    let output = new_axolotlsay.output().unwrap();
+    let stderr_string = String::from_utf8(output.stdout).unwrap();
+    assert_eq!(stderr_string, format!("axolotlsay {}\n", target_version));
+
+    Ok(())
+}
diff --git a/axoupdater/src/lib.rs b/axoupdater/src/lib.rs
index 68269aa..5d4a9b5 100644
--- a/axoupdater/src/lib.rs
+++ b/axoupdater/src/lib.rs
@@ -969,6 +969,8 @@ fn get_app_name() -> Option<String> {
 fn get_config_path(app_name: &str) -> AxoupdateResult<Utf8PathBuf> {
     if env::var("AXOUPDATER_CONFIG_WORKING_DIR").is_ok() {
         Ok(Utf8PathBuf::try_from(current_dir()?)?)
+    } else if let Ok(path) = env::var("AXOUPDATER_CONFIG_PATH") {
+        Ok(Utf8PathBuf::from(path))
     } else {
         let home = if cfg!(windows) {
             env::var("LOCALAPPDATA").map(PathBuf::from).ok()