diff --git a/Cargo.lock b/Cargo.lock
index 24ce716..36a7e11 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -190,8 +190,8 @@ dependencies = [
 
 [[package]]
 name = "ctap_hmac"
-version = "0.3.0"
-source = "git+https://git.shimun.net/shimun/ctap?rev=65ef57403182fce13b5266ba7838558ba2ad008f#65ef57403182fce13b5266ba7838558ba2ad008f"
+version = "0.4.0"
+source = "git+https://git.shimun.net/shimun/ctap?rev=cc48719cfa1375909877265905264fad875d1fa3#cc48719cfa1375909877265905264fad875d1fa3"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "cbor-codec 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -405,7 +405,7 @@ dependencies = [
 name = "pam_fido2"
 version = "0.2.2"
 dependencies = [
- "ctap_hmac 0.3.0 (git+https://git.shimun.net/shimun/ctap?rev=65ef57403182fce13b5266ba7838558ba2ad008f)",
+ "ctap_hmac 0.4.0 (git+https://git.shimun.net/shimun/ctap?rev=cc48719cfa1375909877265905264fad875d1fa3)",
  "ctrlc 3.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -892,7 +892,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum crossbeam-queue 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c695eeca1e7173472a32221542ae469b3e9aac3a4fc81f7696bcad82029493db"
 "checksum crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
 "checksum csv-core 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2b2466559f260f48ad25fe6317b3c8dac77b5bdb5763ac7d9d6103530663bc90"
-"checksum ctap_hmac 0.3.0 (git+https://git.shimun.net/shimun/ctap?rev=65ef57403182fce13b5266ba7838558ba2ad008f)" = "<none>"
+"checksum ctap_hmac 0.4.0 (git+https://git.shimun.net/shimun/ctap?rev=cc48719cfa1375909877265905264fad875d1fa3)" = "<none>"
 "checksum ctrlc 3.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7a4ba686dff9fa4c1c9636ce1010b0cf98ceb421361b0bb3d6faeec43bd217a7"
 "checksum darling 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0d706e75d87e35569db781a9b5e2416cff1236a47ed380831f959382ccd5f858"
 "checksum darling_core 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f0c960ae2da4de88a91b2d920c2a7233b400bc33cb28453a2987822d8392519b"
diff --git a/Cargo.toml b/Cargo.toml
index 1bd9fb8..5ab241d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ path = "src/main.rs"
 
 
 [dependencies]
-ctap_hmac = { git = "https://git.shimun.net/shimun/ctap", rev = "65ef57403182fce13b5266ba7838558ba2ad008f", features = ["request_multiple"] }
+ctap_hmac = { git = "https://git.shimun.net/shimun/ctap", rev = "cc48719cfa1375909877265905264fad875d1fa3", features = ["request_multiple"] }
 pamsm = "0.2.0"
 regex = "1.3.1"
 rand = "0.7.2"