diff --git a/Cargo.lock b/Cargo.lock
index 0f90676..56c11cb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -21,16 +21,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "ascii"
-version = "0.9.3"
+name = "bytes"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eab1c04a571841102f5345a8fc0f6bb3d31c315dec879b5c6e42e40ce7ffa34e"
-
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+checksum = "dfb24e866b15a1af2a1b663f10c6b6b8f397a84aadb828f12e5b289ec23a3a3c"
 
 [[package]]
 name = "cfg-if"
@@ -57,15 +51,12 @@ dependencies = [
 
 [[package]]
 name = "combine"
-version = "3.8.1"
+version = "4.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da3da6baa321ec19e1cc41d31bf599f00c783d0517095cdaf0332e3fe8d20680"
+checksum = "35ed6e9d84f0b51a7f52daf1c7d71dd136fd7a3f41a8462b8cdb8c78d920fad4"
 dependencies = [
- "ascii",
- "byteorder",
- "either",
+ "bytes",
  "memchr",
- "unreachable",
 ]
 
 [[package]]
@@ -103,12 +94,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
-[[package]]
-name = "either"
-version = "1.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f107b87b6afc2a64fd13cac55fe06d6c8859f12d4b14cbcdd2c67d0976781be"
-
 [[package]]
 name = "getrandom"
 version = "0.2.3"
@@ -305,21 +290,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "15c61ba63f9235225a22310255a29b806b907c9b8c964bcbd0a2c70f3f2deea7"
 
-[[package]]
-name = "unreachable"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
-dependencies = [
- "void",
-]
-
-[[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-
 [[package]]
 name = "wasi"
 version = "0.10.2+wasi-snapshot-preview1"
diff --git a/examples/combine-app/Cargo.toml b/examples/combine-app/Cargo.toml
index ec79cc2..0dafb28 100644
--- a/examples/combine-app/Cargo.toml
+++ b/examples/combine-app/Cargo.toml
@@ -8,4 +8,4 @@ name = "combine-app"
 path = "app.rs"
 
 [dependencies]
-combine = "3.8.1"
+combine = "4.6.6"