diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4aa40ab..d9358c55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-### 1.4.0-RC1 ###
+### 1.4.0 ###
 * :wrench: Avoid task spawning in client FFI methods. See [#136](https://github.com/stepfunc/rodbus/pull/136).
 * :wrench: Requests in the client API now fail immediately while the client is connecting.
 
diff --git a/Cargo.lock b/Cargo.lock
index 8d013ba8..ae69060b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "addr2line"
-version = "0.21.0"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+checksum = "6e4503c46a5c0c7844e948c9a4d6acd9f50cccb4de1c48eb9e291ea17470c678"
 dependencies = [
  "gimli",
 ]
@@ -93,9 +93,9 @@ dependencies = [
 
 [[package]]
 name = "anstyle-query"
-version = "1.0.3"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a64c907d4e79225ac72e2a354c9ce84d50ebb4586dee56c82b3ee73004f537f5"
+checksum = "ad186efb764318d35165f1758e7dcef3b10628e26d41a44bc5550652e6804391"
 dependencies = [
  "windows-sys 0.52.0",
 ]
@@ -151,9 +151,9 @@ checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
 
 [[package]]
 name = "backtrace"
-version = "0.3.71"
+version = "0.3.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26b05800d2e817c8b3b4b54abd461726265fa9789ae34330622f2db9ee696f9d"
+checksum = "5cc23269a4f8976d0a4d2e7109211a419fe30e8d88d677cd60b6bc79c5732e0a"
 dependencies = [
  "addr2line",
  "cc",
@@ -229,9 +229,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.97"
+version = "1.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "099a5357d84c4c61eb35fc8eafa9a79a902c2f76911e5747ced4e032edd8d9b4"
+checksum = "c891175c3fb232128f48de6590095e59198bbeb8620c310be349bfc3afd12c7b"
 
 [[package]]
 name = "cesu8"
@@ -284,9 +284,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.4"
+version = "4.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bc066a67923782aa8515dbaea16946c5bcc5addbd668bb80af688e53e548a0"
+checksum = "5db83dced34638ad474f39f250d7fea9598bdd239eaced1bdf45d597da0f433f"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -294,9 +294,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.2"
+version = "4.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae129e2e766ae0ec03484e609954119f123cc1fe650337e155d03b022f24f7b4"
+checksum = "f7e204572485eb3fbf28f871612191521df159bc3e15a9f5064c66dba3a8c05f"
 dependencies = [
  "anstream",
  "anstyle",
@@ -306,9 +306,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.4"
+version = "4.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "528131438037fd55894f62d6e9f068b8f45ac57ffa77517819645d10aed04f64"
+checksum = "c780290ccf4fb26629baa7a1081e68ced113f1d3ec302fa5948f1c381ebf06c6"
 dependencies = [
  "heck 0.5.0",
  "proc-macro2",
@@ -318,9 +318,9 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
+checksum = "4b82cf0babdbd58558212896d1a4272303a57bdb245c2bf1147185fb45640e70"
 
 [[package]]
 name = "colorchoice"
@@ -524,9 +524,9 @@ dependencies = [
 
 [[package]]
 name = "gimli"
-version = "0.28.1"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+checksum = "40ecd4077b5ae9fd2e9e169b102c6c330d0605168eb0e8bf79952b256dbefffd"
 
 [[package]]
 name = "heck"
@@ -650,15 +650,15 @@ dependencies = [
 
 [[package]]
 name = "lazy_static"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "libc"
-version = "0.2.154"
+version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae743338b92ff9146ce83992f766a31066a91a8c84a45e0e9f21e7cf6de6d346"
+checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
 [[package]]
 name = "log"
@@ -677,9 +677,9 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.7.2"
+version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "memoffset"
@@ -692,9 +692,9 @@ dependencies = [
 
 [[package]]
 name = "miniz_oxide"
-version = "0.7.2"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
+checksum = "b8a240ddb74feaf34a79a7add65a741f3167852fba007066dcac1ca548d89c08"
 dependencies = [
  "adler",
 ]
@@ -768,9 +768,9 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.32.2"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
+checksum = "576dfe1fc8f9df304abb159d767a29d0476f7750fbf8aa7ad07816004a207434"
 dependencies = [
  "memchr",
 ]
@@ -788,7 +788,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73f5f798c35376fe2c8cdf364aa0a848f54330646a551100aa6273fa7c1156b8"
 dependencies = [
  "backtrace",
- "clap 4.5.4",
+ "clap 4.5.7",
  "dunce",
  "heck 0.4.1",
  "lazy_static",
@@ -883,9 +883,9 @@ checksum = "e8d0eef3571242013a0d5dc84861c3ae4a652e56e12adf8bdc26ff5f8cb34c94"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.82"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ad3d49ab951a01fbaafe34f2ec74122942fe18a3f9814c3268f1bb72042131b"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
@@ -907,9 +907,9 @@ checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 
 [[package]]
 name = "regex"
-version = "1.10.4"
+version = "1.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -919,9 +919,9 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
+checksum = "38caf58cc5ef2fed281f89292ef23f6365465ed9a41b7a7754eb4e26496c92df"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -930,9 +930,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
+checksum = "7a66a03ae7c801facd77a29370b4faec201768915ac14a721ba36f20bc9c209b"
 
 [[package]]
 name = "ring"
@@ -951,9 +951,9 @@ dependencies = [
 
 [[package]]
 name = "rodbus"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
- "clap 4.5.4",
+ "clap 4.5.7",
  "crc",
  "rx509",
  "scursor",
@@ -971,7 +971,7 @@ dependencies = [
 
 [[package]]
 name = "rodbus-bindings"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
  "oo-bindgen",
  "rodbus-schema",
@@ -981,7 +981,7 @@ dependencies = [
 
 [[package]]
 name = "rodbus-client"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
  "clap 2.34.0",
  "rodbus",
@@ -992,7 +992,7 @@ dependencies = [
 
 [[package]]
 name = "rodbus-ffi"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
  "lazy_static",
  "num_cpus",
@@ -1010,7 +1010,7 @@ dependencies = [
 
 [[package]]
 name = "rodbus-ffi-java"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
  "jni",
  "oo-bindgen",
@@ -1020,7 +1020,7 @@ dependencies = [
 
 [[package]]
 name = "rodbus-schema"
-version = "1.4.0-RC1"
+version = "1.4.0"
 dependencies = [
  "oo-bindgen",
  "sfio-tokio-ffi",
@@ -1035,9 +1035,9 @@ checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
 [[package]]
 name = "rustls"
-version = "0.23.5"
+version = "0.23.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afabcee0551bd1aa3e18e5adbf2c0544722014b899adb31bd186ec638d3da97e"
+checksum = "05cff451f60db80f490f3c182b77c35260baace73209e9cdbbe526bfe3a4d402"
 dependencies = [
  "log",
  "once_cell",
@@ -1056,9 +1056,9 @@ checksum = "976295e77ce332211c0d24d92c0e83e50f5c5f046d11082cea19f3df13a3562d"
 
 [[package]]
 name = "rustls-webpki"
-version = "0.102.3"
+version = "0.102.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3bce581c0dd41bce533ce695a1437fa16a7ab5ac3ccfa99fe1a620a7885eabf"
+checksum = "ff448f7e92e913c4b7d4c6d8e4540a1724b319b4152b8aef6d4cf8339712b33e"
 dependencies = [
  "ring",
  "rustls-pki-types",
@@ -1126,18 +1126,18 @@ checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
 
 [[package]]
 name = "serde"
-version = "1.0.201"
+version = "1.0.203"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "780f1cebed1629e4753a1a38a3c72d30b97ec044f0aef68cb26650a3c5cf363c"
+checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.201"
+version = "1.0.203"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5e405930b9796f1c00bee880d03fc7e0bb4b9a11afc776885ffe84320da2865"
+checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1294,15 +1294,15 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "subtle"
-version = "2.5.0"
+version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
+checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "syn"
-version = "2.0.63"
+version = "2.0.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf5be731623ca1a1fb7d8be6f261a3be6d3e2337b8a1f97be944d020c8fcb704"
+checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1320,18 +1320,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.60"
+version = "1.0.61"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "579e9083ca58dd9dcf91a9923bb9054071b9ebbd800b342194c9feb0ee89fc18"
+checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.60"
+version = "1.0.61"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2470041c06ec3ac1ab38d0356a6119054dedaea53e12fbefc0de730a1c08524"
+checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1350,9 +1350,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.37.0"
+version = "1.38.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1adbebffeca75fcfd058afa480fb6c0b81e165a0323f9c9d39c9697e37c46787"
+checksum = "ba4f4a02a7a80d6f274636f0aa95c7e383b912d41fe721a31f29e29698585a4a"
 dependencies = [
  "backtrace",
  "bytes",
@@ -1367,9 +1367,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "2.2.0"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b8a1e28f2deaa14e508979454cb3a223b10b938b45af148bc0986de36f1923b"
+checksum = "5f5ae998a069d4b5aba8ee9dad856af7d520c3699e6159b185c2acd48155d39a"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1531,9 +1531,9 @@ checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "unicode-width"
-version = "0.1.12"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68f5e5f3158ecfd4b8ff6fe086db7c8467a2dfdac97fe420f2b7c4aa97af66d6"
+checksum = "0336d538f7abc86d282a4189614dfaa90810dfc2c6f6427eaf88e16311dd225d"
 
 [[package]]
 name = "untrusted"
@@ -1543,9 +1543,9 @@ checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
 [[package]]
 name = "utf8parse"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
 [[package]]
 name = "valuable"
@@ -1816,6 +1816,6 @@ checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
 
 [[package]]
 name = "zeroize"
-version = "1.7.0"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"
+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
diff --git a/Cargo.toml b/Cargo.toml
index 57eb3019..b5a26d10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,7 +34,7 @@ non_ascii_idents = "deny"
 unreachable_pub = "deny"
 trivial_casts = "deny"
 missing_docs = "deny"
-unused = "deny"
+unused = { level = "deny", priority = -1 }
 missing_copy_implementations = "deny"
 
 [profile.release]
diff --git a/ffi/bindings/java/examples/pom.xml b/ffi/bindings/java/examples/pom.xml
index 30022e60..83049555 100644
--- a/ffi/bindings/java/examples/pom.xml
+++ b/ffi/bindings/java/examples/pom.xml
@@ -16,7 +16,7 @@
         <dependency>
             <groupId>io.stepfunc</groupId>
             <artifactId>rodbus</artifactId>
-            <version>1.4.0-RC1</version>
+            <version>1.4.0</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/ffi/bindings/java/rodbus-tests/pom.xml b/ffi/bindings/java/rodbus-tests/pom.xml
index 90387fee..ebdff800 100644
--- a/ffi/bindings/java/rodbus-tests/pom.xml
+++ b/ffi/bindings/java/rodbus-tests/pom.xml
@@ -26,7 +26,7 @@
         <dependency>
             <groupId>io.stepfunc</groupId>
             <artifactId>rodbus</artifactId>
-            <version>1.4.0-RC1</version>
+            <version>1.4.0</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
diff --git a/ffi/rodbus-bindings/Cargo.toml b/ffi/rodbus-bindings/Cargo.toml
index 044a3ed1..5bf35985 100644
--- a/ffi/rodbus-bindings/Cargo.toml
+++ b/ffi/rodbus-bindings/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-bindings"
-version = "1.4.0-RC1"
+version = "1.4.0"
 description = "application to generate bindings for Rodbus"
 readme = "../README.md"
 
diff --git a/ffi/rodbus-ffi-java/Cargo.toml b/ffi/rodbus-ffi-java/Cargo.toml
index 654e0ab7..e935f276 100644
--- a/ffi/rodbus-ffi-java/Cargo.toml
+++ b/ffi/rodbus-ffi-java/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-ffi-java"
-version = "1.4.0-RC1"
+version = "1.4.0"
 authors = ["Step Function I/O LLC <info@stepfunc.io>"]
 edition = "2021"
 build = "build.rs"
diff --git a/ffi/rodbus-ffi/Cargo.toml b/ffi/rodbus-ffi/Cargo.toml
index 95e50d6d..60d16218 100644
--- a/ffi/rodbus-ffi/Cargo.toml
+++ b/ffi/rodbus-ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-ffi"
-version = "1.4.0-RC1"
+version = "1.4.0"
 authors = ["Step Function I/O LLC <info@stepfunc.io>"]
 edition = "2021"
 description = "FFI for Rodbus"
diff --git a/ffi/rodbus-schema/Cargo.toml b/ffi/rodbus-schema/Cargo.toml
index 62447268..1bcb495d 100644
--- a/ffi/rodbus-schema/Cargo.toml
+++ b/ffi/rodbus-schema/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "rodbus-schema"
 # this is the version that all the FFI libraries get, since it's in their schema
-version = "1.4.0-RC1"
+version = "1.4.0"
 description = "oobindgen schema for Rodbus"
 readme = "../README.md"
 
diff --git a/guide/sitedata.json b/guide/sitedata.json
index d94d276d..a465758a 100644
--- a/guide/sitedata.json
+++ b/guide/sitedata.json
@@ -1,4 +1,4 @@
 {
-    "version": "1.4.0-RC1",
+    "version": "1.4.0",
     "github_url": "https://github.com/stepfunc/rodbus"
 }
\ No newline at end of file
diff --git a/rodbus-client/Cargo.toml b/rodbus-client/Cargo.toml
index a3229f77..45c14bdf 100644
--- a/rodbus-client/Cargo.toml
+++ b/rodbus-client/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-client"
-version = "1.4.0-RC1"
+version = "1.4.0"
 description = "A command line program for making Modbus client requests using the Rodbus crate"
 readme = "README.md"
 
diff --git a/rodbus/Cargo.toml b/rodbus/Cargo.toml
index 146ab396..481bf21f 100644
--- a/rodbus/Cargo.toml
+++ b/rodbus/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus"
-version = "1.4.0-RC1"
+version = "1.4.0"
 description = "A high-performance async implementation of the Modbus protocol using tokio"
 readme = "README.md"