diff --git a/CHANGELOG.md b/CHANGELOG.md
index fff9255..b66aba2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ## Unreleased
 
+- *Breaking:* The feature `defmt-03` has been renamed `defmt-10` to avoid a future breaking change.
+
 ## 5.0.0 31-07-25
 
 - Added `Key` implementation for the unit type `()` for easy storage of a single value
diff --git a/Cargo.toml b/Cargo.toml
index adc7313..53be9b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ rust-version = "1.87"
 
 [dependencies]
 embedded-storage-async = "0.4.1"
-defmt = { version = "0.3", optional = true }
+defmt = { version = "1.0.1", optional = true }
 futures = { version = "0.3.30", features = ["executor"], optional = true }
 approx = { version = "0.5.1", optional = true }
 arrayvec = { version = "0.7.4", default-features = false, optional = true }
@@ -26,7 +26,7 @@ futures = { version = "0.3.30", features = ["executor"] }
 futures-test = "0.3.30"
 
 [features]
-defmt-03 = ["dep:defmt"]
+defmt-10 = ["dep:defmt"]
 std = []
 # Enable the implementation of the map Key trait for ArrayVec and ArrayString
 arrayvec = ["dep:arrayvec"]
diff --git a/example/Cargo.lock b/example/Cargo.lock
index fb72a59..93c1eed 100644
--- a/example/Cargo.lock
+++ b/example/Cargo.lock
@@ -4,9 +4,9 @@ version = 4
 
 [[package]]
 name = "autocfg"
-version = "1.2.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1fdabc7756949593fe60f30ec81974b613357de856987752631dea1e3394c80"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
 name = "az"
@@ -37,15 +37,15 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "6a65b545ab31d687cff52899d4890855fec459eb6afe0da6417b8a18da87aa29"
 
 [[package]]
 name = "bytemuck"
-version = "1.15.0"
+version = "1.23.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d6d68c57235a3a081186990eca2867354726650f42f7516ca50c28d6281fd15"
+checksum = "3995eaeebcdf32f91f980d360f78732ddc061097ab4e39991ae7a6ace9194677"
 
 [[package]]
 name = "byteorder"
@@ -55,9 +55,9 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "cfg-if"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
 
 [[package]]
 name = "cortex-m"
@@ -74,41 +74,41 @@ dependencies = [
 
 [[package]]
 name = "cortex-m-rt"
-version = "0.7.3"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee84e813d593101b1723e13ec38b6ab6abbdbaaa4546553f5395ed274079ddb1"
+checksum = "801d4dec46b34c299ccf6b036717ae0fce602faa4f4fe816d9013b9a7c9f5ba6"
 dependencies = [
  "cortex-m-rt-macros",
 ]
 
 [[package]]
 name = "cortex-m-rt-macros"
-version = "0.7.0"
+version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0f6f3e36f203cfedbc78b357fb28730aa2c6dc1ab060ee5c2405e843988d3c7"
+checksum = "e37549a379a9e0e6e576fd208ee60394ccb8be963889eebba3ffe0980364f472"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
 name = "critical-section"
-version = "1.1.2"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
 
 [[package]]
 name = "crunchy"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
+checksum = "460fbee9c2c2f33933d720630a6a0bac33ba7053db5344fac858d4b8952d77d5"
 
 [[package]]
 name = "darling"
-version = "0.20.8"
+version = "0.20.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54e36fcd13ed84ffdfda6f5be89b31287cbb80c439841fe69e04841435464391"
+checksum = "fc7f46116c46ff9ab3eb1597a45688b6715c6e628b5c133e288e709a29bcb4ee"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -116,34 +116,43 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.20.8"
+version = "0.20.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c2cf1c23a687a1feeb728783b993c4e1ad83d99f351801977dd809b48d0a70f"
+checksum = "0d00b9596d185e565c2207a0b01f8bd1a135483d02d9b7b0a54b11da8d53412e"
 dependencies = [
  "fnv",
  "ident_case",
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
 name = "darling_macro"
-version = "0.20.8"
+version = "0.20.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a668eda54683121533a393014d8692171709ff57a7d61f187b6e782719f8933f"
+checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.58",
+ "syn",
+]
+
+[[package]]
+name = "defmt"
+version = "0.3.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0963443817029b2024136fc4dd07a5107eb8f977eaf18fcd1fdeb11306b64ad"
+dependencies = [
+ "defmt 1.0.1",
 ]
 
 [[package]]
 name = "defmt"
-version = "0.3.6"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3939552907426de152b3c2c6f51ed53f98f448babd26f28694c95f5906194595"
+checksum = "548d977b6da32fa1d1fda2876453da1e7df63ad0304c8b3dae4dbe7b96f39b78"
 dependencies = [
  "bitflags 1.3.2",
  "defmt-macros",
@@ -151,41 +160,41 @@ dependencies = [
 
 [[package]]
 name = "defmt-macros"
-version = "0.3.7"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18bdc7a7b92ac413e19e95240e75d3a73a8d8e78aa24a594c22cbb4d44b4bbda"
+checksum = "3d4fc12a85bcf441cfe44344c4b72d58493178ce635338a3f3b78943aceb258e"
 dependencies = [
  "defmt-parser",
- "proc-macro-error",
+ "proc-macro-error2",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
 name = "defmt-parser"
-version = "0.3.4"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff4a5fefe330e8d7f31b16a318f9ce81000d8e35e69b93eae154d16d2278f70f"
+checksum = "10d60334b3b2e7c9d91ef8150abfb6fa4c1c39ebbcf4a81c2e346aad939fee3e"
 dependencies = [
  "thiserror",
 ]
 
 [[package]]
 name = "defmt-rtt"
-version = "0.4.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "609923761264dd99ed9c7d209718cda4631c5fe84668e0f0960124cbb844c49f"
+checksum = "b2cac3b8a5644a9e02b75085ebad3b6deafdbdbdec04bb25086523828aa4dfd1"
 dependencies = [
  "critical-section",
- "defmt",
+ "defmt 1.0.1",
 ]
 
 [[package]]
 name = "document-features"
-version = "0.2.8"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef5282ad69563b5fc40319526ba27e0e7363d552a896f0297d54f767717f9b95"
+checksum = "95249b50c6c185bee49034bcb378a49dc2b5dff0be90ff6616d31d64febab05d"
 dependencies = [
  "litrs",
 ]
@@ -195,7 +204,7 @@ name = "embassy-embedded-hal"
 version = "0.1.0"
 source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06b484898c5935957b33b60a9c88b2"
 dependencies = [
- "defmt",
+ "defmt 0.3.100",
  "embassy-futures",
  "embassy-sync",
  "embassy-time",
@@ -214,7 +223,7 @@ source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06
 dependencies = [
  "cortex-m",
  "critical-section",
- "defmt",
+ "defmt 0.3.100",
  "document-features",
  "embassy-executor-macros",
 ]
@@ -227,7 +236,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -242,7 +251,7 @@ source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06
 dependencies = [
  "cortex-m",
  "critical-section",
- "defmt",
+ "defmt 0.3.100",
  "num-traits",
 ]
 
@@ -251,12 +260,12 @@ name = "embassy-nrf"
 version = "0.1.0"
 source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06b484898c5935957b33b60a9c88b2"
 dependencies = [
- "bitflags 2.5.0",
+ "bitflags 2.9.2",
  "cfg-if",
  "cortex-m",
  "cortex-m-rt",
  "critical-section",
- "defmt",
+ "defmt 0.3.100",
  "document-features",
  "embassy-embedded-hal",
  "embassy-hal-internal",
@@ -291,7 +300,7 @@ source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06
 dependencies = [
  "cfg-if",
  "critical-section",
- "defmt",
+ "defmt 0.3.100",
  "embedded-io-async",
  "futures-util",
  "heapless",
@@ -332,7 +341,7 @@ name = "embassy-usb-driver"
 version = "0.1.0"
 source = "git+https://github.com/embassy-rs/embassy.git?rev=029636e#029636e6fc06b484898c5935957b33b60a9c88b2"
 dependencies = [
- "defmt",
+ "defmt 0.3.100",
 ]
 
 [[package]]
@@ -396,7 +405,7 @@ version = "0.1.0"
 dependencies = [
  "cortex-m",
  "cortex-m-rt",
- "defmt",
+ "defmt 1.0.1",
  "defmt-rtt",
  "embassy-embedded-hal",
  "embassy-executor",
@@ -409,9 +418,9 @@ dependencies = [
 
 [[package]]
 name = "fixed"
-version = "1.27.0"
+version = "1.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fc715d38bea7b5bf487fcd79bcf8c209f0b58014f3018a7a19c2b855f472048"
+checksum = "707070ccf8c4173548210893a0186e29c266901b71ed20cd9e2ca0193dfe95c3"
 dependencies = [
  "az",
  "bytemuck",
@@ -427,21 +436,21 @@ checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
 name = "futures-core"
-version = "0.3.30"
+version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
+checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
 
 [[package]]
 name = "futures-task"
-version = "0.3.30"
+version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38d84fa142264698cdce1a9f9172cf383a0c82de1bddcf3092901442c4097004"
+checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
 
 [[package]]
 name = "futures-util"
-version = "0.3.30"
+version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
+checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -451,9 +460,9 @@ dependencies = [
 
 [[package]]
 name = "half"
-version = "2.4.1"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6dd08c532ae367adf81c312a4580bc67f1d0fe8bc9c460520283f4c0ff277888"
+checksum = "459196ed295495a68f7d7fe1d84f6c4b7ff0e21fe3017b2f283c6fac3ad803c9"
 dependencies = [
  "cfg-if",
  "crunchy",
@@ -486,9 +495,9 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "litrs"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4ce301924b7887e9d637144fdade93f9dfff9b60981d4ac161db09720d39aa5"
+checksum = "f5e54036fe321fd421e10d732f155734c4e4afd610dd556d9a82833ab3ee0bed"
 
 [[package]]
 name = "nb"
@@ -628,28 +637,28 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.18"
+version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "panic-probe"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa6fa5645ef5a760cd340eaa92af9c1ce131c8c09e7f8926d8a24b59d26652b9"
+checksum = "4047d9235d1423d66cc97da7d07eddb54d4f154d6c13805c6d0793956f4f25b0"
 dependencies = [
  "cortex-m",
- "defmt",
+ "defmt 0.3.100",
 ]
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.14"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
+checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
 
 [[package]]
 name = "pin-utils"
@@ -658,43 +667,41 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
 [[package]]
-name = "proc-macro-error"
-version = "1.0.4"
+name = "proc-macro-error-attr2"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+checksum = "96de42df36bb9bba5542fe9f1a054b8cc87e172759a1868aa05c1f3acc89dfc5"
 dependencies = [
- "proc-macro-error-attr",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
- "version_check",
 ]
 
 [[package]]
-name = "proc-macro-error-attr"
-version = "1.0.4"
+name = "proc-macro-error2"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+checksum = "11ec05c52be0a07b08061f7dd003e7d7092e0472bc731b4af7bb1ef876109802"
 dependencies = [
+ "proc-macro-error-attr2",
  "proc-macro2",
  "quote",
- "version_check",
+ "syn",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.79"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.35"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+checksum = "1885c039570dc00dcb4ff087a89e185fd56bae234ddc7f056a945bf36467248d"
 dependencies = [
  "proc-macro2",
 ]
@@ -733,7 +740,7 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 name = "sequential-storage"
 version = "5.0.0"
 dependencies = [
- "defmt",
+ "defmt 1.0.1",
  "embedded-storage-async",
 ]
 
@@ -745,26 +752,15 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
 [[package]]
 name = "strsim"
-version = "0.10.0"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
-[[package]]
-name = "syn"
-version = "2.0.58"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44cfb93f38070beee36b3fef7d4f5a16f27751d94b187b666a5cc5e9b0d30687"
+checksum = "ede7c438028d4436d71104916910f5bb611972c5cfd7f89b8300a8186e6fada6"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -773,35 +769,35 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.58"
+version = "2.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03468839009160513471e86a034bb2c5c0e4baae3b43f79ffc55c4a5427b3297"
+checksum = "80d76d3f064b981389ecb4b6b7f45a0bf9fdac1d5b9204c7bd6714fecc302850"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.58"
+version = "2.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
+checksum = "44d29feb33e986b6ea906bd9c3559a856983f92371b3eaa5e83782a351623de0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
 name = "typenum"
-version = "1.17.0"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+checksum = "1dccffe3ce07af9386bfd29e80c0ab1a8205a2fc34e4bcd40364df902cfa8f3f"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.12"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
 [[package]]
 name = "vcell"
@@ -809,12 +805,6 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
 
-[[package]]
-name = "version_check"
-version = "0.9.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
-
 [[package]]
 name = "void"
 version = "1.0.2"
diff --git a/example/Cargo.toml b/example/Cargo.toml
index 36b1cf3..69c1452 100644
--- a/example/Cargo.toml
+++ b/example/Cargo.toml
@@ -8,8 +8,8 @@ embassy-executor = { git = "https://github.com/embassy-rs/embassy.git", rev = "0
 embassy-nrf = { git = "https://github.com/embassy-rs/embassy.git", rev = "029636e", features = ["defmt", "nrf52840"] }
 embassy-embedded-hal = { git = "https://github.com/embassy-rs/embassy.git", rev = "029636e", default-features = false }
 
-defmt = "0.3"
-defmt-rtt = "0.4"
+defmt = "1.0.1"
+defmt-rtt = "1.0.0"
 
 cortex-m = { version = "0.7.6", features = ["inline-asm", "critical-section-single-core"] }
 cortex-m-rt = "0.7.0"
@@ -17,7 +17,7 @@ panic-probe = { version = "0.3", features = ["print-defmt"] }
 embedded-storage = "0.3.1"
 embedded-storage-async = "0.4.1"
 
-sequential-storage = { path = "../", features = ["defmt-03"] }
+sequential-storage = { path = "../", features = ["defmt-10"] }
 
 [profile.release]
 lto = true
diff --git a/src/cache/key_pointers.rs b/src/cache/key_pointers.rs
index 19d6938..59bd919 100644
--- a/src/cache/key_pointers.rs
+++ b/src/cache/key_pointers.rs
@@ -12,7 +12,7 @@ pub(crate) trait KeyPointersCache<KEY: Key> {
 }
 
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct CachedKeyPointers<KEY: Eq, const KEYS: usize> {
     key_pointers: [Option<(KEY, NonZeroU32)>; KEYS],
 }
@@ -74,7 +74,7 @@ impl<KEY: Key, const KEYS: usize> KeyPointersCache<KEY> for CachedKeyPointers<KE
 }
 
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct UncachedKeyPointers;
 
 impl<KEY: Key> KeyPointersCache<KEY> for UncachedKeyPointers {
diff --git a/src/cache/mod.rs b/src/cache/mod.rs
index 25f4fa1..2ef672b 100644
--- a/src/cache/mod.rs
+++ b/src/cache/mod.rs
@@ -164,7 +164,7 @@ impl<KEY: Key, T: PrivateKeyCacheImpl<KEY>> PrivateKeyCacheImpl<KEY> for &mut T
 }
 
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct DirtTracker {
     /// Managed from the library code.
     ///
@@ -199,7 +199,7 @@ impl DirtTracker {
 /// This type of cache doesn't have to be kept around and may be constructed on every api call.
 /// You could simply pass `&mut NoCache::new()` every time.
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub struct NoCache {
     page_states: UncachedPageStates,
     page_pointers: UncachedPagePointers,
@@ -268,7 +268,7 @@ impl<KEY: Key> PrivateKeyCacheImpl<KEY> for NoCache {
 ///
 /// Make sure the page count is correct. If the number is lower than the actual amount, the code will panic at some point.
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub struct PageStateCache<const PAGE_COUNT: usize> {
     dirt_tracker: DirtTracker,
     page_states: CachedPageStates<PAGE_COUNT>,
@@ -342,7 +342,7 @@ impl<KEY: Key, const PAGE_COUNT: usize> PrivateKeyCacheImpl<KEY> for PageStateCa
 ///
 /// Make sure the page count is correct. If the number is lower than the actual amount, the code will panic at some point.
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub struct PagePointerCache<const PAGE_COUNT: usize> {
     dirt_tracker: DirtTracker,
     page_states: CachedPageStates<PAGE_COUNT>,
@@ -421,7 +421,7 @@ impl<KEY: Key, const PAGE_COUNT: usize> PrivateKeyCacheImpl<KEY> for PagePointer
 /// the chance of a cache hit.
 /// The keys are cached in a fifo and any time its location is updated in cache it's added to the front.
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub struct KeyPointerCache<const PAGE_COUNT: usize, KEY: Key, const KEYS: usize> {
     dirt_tracker: DirtTracker,
     page_states: CachedPageStates<PAGE_COUNT>,
diff --git a/src/cache/page_pointers.rs b/src/cache/page_pointers.rs
index 5549766..95a363e 100644
--- a/src/cache/page_pointers.rs
+++ b/src/cache/page_pointers.rs
@@ -29,7 +29,7 @@ pub(crate) trait PagePointersCache: Debug {
 
 // Use NoneZeroU32 because we never store 0's in here (because of the first page marker)
 // and so Option can make use of the niche so we save bytes
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct CachedPagePointers<const PAGE_COUNT: usize> {
     after_erased_pointers: [Option<NonZeroU32>; PAGE_COUNT],
     after_written_pointers: [Option<NonZeroU32>; PAGE_COUNT],
@@ -139,7 +139,7 @@ impl<const PAGE_COUNT: usize> PagePointersCache for CachedPagePointers<PAGE_COUN
 }
 
 #[derive(Debug, Default)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct UncachedPagePointers;
 
 impl PagePointersCache for UncachedPagePointers {
diff --git a/src/cache/page_states.rs b/src/cache/page_states.rs
index 6df9b8c..fd58a5b 100644
--- a/src/cache/page_states.rs
+++ b/src/cache/page_states.rs
@@ -8,7 +8,7 @@ pub(crate) trait PageStatesCache: Debug {
     fn invalidate_cache_state(&mut self);
 }
 
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct CachedPageStates<const PAGE_COUNT: usize> {
     pages: [Option<PageState>; PAGE_COUNT],
 }
@@ -56,7 +56,7 @@ impl<const PAGE_COUNT: usize> PageStatesCache for CachedPageStates<PAGE_COUNT> {
 }
 
 #[derive(Debug, Default)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub(crate) struct UncachedPageStates;
 
 impl PageStatesCache for UncachedPageStates {
diff --git a/src/lib.rs b/src/lib.rs
index 1af54da..6b0d8ad 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -336,7 +336,7 @@ async fn partial_close_page<S: NorFlash>(
 
 /// The state of a page
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 enum PageState {
     /// This page was fully written and has now been sealed
     Closed,
@@ -376,7 +376,7 @@ impl PageState {
 /// The main error type
 #[non_exhaustive]
 #[derive(Debug)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub enum Error<S> {
     /// An error in the storage (flash)
     Storage {
diff --git a/src/map.rs b/src/map.rs
index 05de294..1fb763e 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -1173,7 +1173,7 @@ impl_map_item_num!(f64);
 /// This error type is predefined (in contrast to using generics) to save many kilobytes of binary size.
 #[non_exhaustive]
 #[derive(Debug, PartialEq, Eq, Clone)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt-10", derive(defmt::Format))]
 pub enum SerializationError {
     /// The provided buffer was too small.
     BufferTooSmall,