diff --git a/lock.json b/lock.json
index cf0ed79..61af627 100644
--- a/lock.json
+++ b/lock.json
@@ -33,38 +33,16 @@
       "srcDir": "src",
       "url": "https://git.sr.ht/~ehmry/getdns-nim/archive/c73cbe288d9f9480586b8fa87f6d794ffb6a6ce6.tar.gz"
     },
-    {
-      "method": "fetchzip",
-      "packages": [
-        "getdns"
-      ],
-      "path": "/nix/store/x9xmn7w4k6jg8nv5bnx148ibhnsfh362-source",
-      "rev": "c73cbe288d9f9480586b8fa87f6d794ffb6a6ce6",
-      "sha256": "1sbgx2x51szr22i72n7c8jglnfmr8m7y7ga0v85d58fwadiv7g6b",
-      "srcDir": "src",
-      "url": "https://git.sr.ht/~ehmry/getdns-nim/archive/c73cbe288d9f9480586b8fa87f6d794ffb6a6ce6.tar.gz"
-    },
-    {
-      "method": "fetchzip",
-      "packages": [
-        "hashlib"
-      ],
-      "path": "/nix/store/fav82xdbicvlk34nmcbl89zx99lr3mbs-source",
-      "rev": "f9455d4be988e14e3dc7933eb7cc7d7c4820b7ac",
-      "sha256": "1sx6j952lj98629qfgr7ds5aipyw9d6lldcnnqs205wpj4pkcjb3",
-      "srcDir": "",
-      "url": "https://github.com/ehmry/hashlib/archive/f9455d4be988e14e3dc7933eb7cc7d7c4820b7ac.tar.gz"
-    },
     {
       "method": "fetchzip",
       "packages": [
         "nimcrypto"
       ],
       "path": "/nix/store/fkrcpp8lzj2yi21na79xm63xk0ggnqsp-source",
-      "rev": "f147d30c69bc1c9bcf0e37f7699bcf0fbaab97b5",
+      "rev": "485f7b3cfa83c1beecc0e31be0e964d697aa74d7",
       "sha256": "1h3dzdbc9kacwpi10mj73yjglvn7kbizj1x8qc9099ax091cj5xn",
       "srcDir": "",
-      "url": "https://github.com/cheatfate/nimcrypto/archive/f147d30c69bc1c9bcf0e37f7699bcf0fbaab97b5.tar.gz"
+      "url": "https://github.com/cheatfate/nimcrypto/archive/485f7b3cfa83c1beecc0e31be0e964d697aa74d7.tar.gz"
     },
     {
       "method": "fetchzip",
@@ -110,17 +88,6 @@
       "srcDir": "src",
       "url": "https://github.com/ehmry/nim-sys/archive/4ef3b624db86e331ba334e705c1aa235d55b05e1.tar.gz"
     },
-    {
-      "method": "fetchzip",
-      "packages": [
-        "sys"
-      ],
-      "path": "/nix/store/vf9ls2wip6d8xhsi3rjh0dqsqg597i6b-source",
-      "rev": "c117ee60542f084525f254e6ade590675a6a2ed6",
-      "sha256": "12qzx2lnh84xqfgypy0pka8nflq0y8n1izfwx8mb4zya5nzawmyf",
-      "srcDir": "src",
-      "url": "https://github.com/alaviss/nim-sys/archive/c117ee60542f084525f254e6ade590675a6a2ed6.tar.gz"
-    },
     {
       "method": "fetchzip",
       "packages": [
@@ -148,28 +115,6 @@
       "sha256": "13gjixw80vjqj0xlx2y85ixal82sa27q7j57j9383bqq11lgv5l9",
       "srcDir": "pkg",
       "url": "https://git.sr.ht/~ehmry/solo5_dispatcher"
-    },
-    {
-      "method": "fetchzip",
-      "packages": [
-        "cps"
-      ],
-      "path": "/nix/store/phdf6siqbhj7vx4qq507lzla81si60iz-source",
-      "rev": "58772ff9ddb38a4b2ec52da142d8532ba2fe7039",
-      "sha256": "1lph7v27nqwgm3a0ssi8q348gjrkjwgqc50agw38j7xif6wj80cw",
-      "srcDir": "",
-      "url": "https://github.com/ehmry/cps/archive/58772ff9ddb38a4b2ec52da142d8532ba2fe7039.tar.gz"
-    },
-    {
-      "method": "fetchzip",
-      "packages": [
-        "stew"
-      ],
-      "path": "/nix/store/mqg8qzsbcc8xqabq2yzvlhvcyqypk72c-source",
-      "rev": "3c91b8694e15137a81ec7db37c6c58194ec94a6a",
-      "sha256": "17lfhfxp5nxvld78xa83p258y80ks5jb4n53152cdr57xk86y07w",
-      "srcDir": "",
-      "url": "https://github.com/status-im/nim-stew/archive/3c91b8694e15137a81ec7db37c6c58194ec94a6a.tar.gz"
     }
   ]
 }
diff --git a/src/syndicate/capabilities.nim b/src/syndicate/capabilities.nim
index 1c32892..adc0e3a 100644
--- a/src/syndicate/capabilities.nim
+++ b/src/syndicate/capabilities.nim
@@ -6,17 +6,21 @@ runnableExamples:
   let sturdy = mint()
   check $sturdy == """<ref {oid: "syndicate" sig: #x"69ca300c1dbfa08fba692102dd82311a"}>"""
 
-import std/[options, tables]
-from std/sequtils import toSeq
-import hashlib/misc/blake2
-
-import preserves
-import ./protocols/sturdy
+import
+  std/[options, tables],
+  nimcrypto/[blake2, hmac],
+  preserves,
+  ./protocols/sturdy
 
 export `$`
 
 proc hmac(key, data: openarray[byte]): seq[byte] =
-  count[Hmac[BLAKE2S_256]](key, data).data[0..15].toSeq
+  var ctx: HMAC[blake2_256]
+  ctx.init key
+  ctx.update data
+  result.setLen 32
+  discard ctx.finish result
+  result.setLen 16
 
 proc mint*(key: openarray[byte]; oid: Value): SturdyRef =
   result.parameters.oid = oid
diff --git a/syndicate.nimble b/syndicate.nimble
index 8be32f8..9ba2920 100644
--- a/syndicate.nimble
+++ b/syndicate.nimble
@@ -9,4 +9,4 @@ srcDir        = "src"
 
 # Dependencies
 
-requires "https://github.com/ehmry/hashlib.git >= 20231130", "nim >= 2.0.0", "https://git.syndicate-lang.org/ehmry/preserves-nim.git >= 20240422", "https://github.com/ehmry/nim-sys.git#4ef3b624db86e331ba334e705c1aa235d55b05e1", "https://git.sr.ht/~ehmry/nim_taps >= 20240405"
+requires "nim >= 2.0.0", "https://github.com/cheatfate/nimcrypto#485f7b3cfa83c1beecc0e31be0e964d697aa74d7", "https://git.syndicate-lang.org/ehmry/preserves-nim.git >= 20240422", "https://github.com/ehmry/nim-sys.git#4ef3b624db86e331ba334e705c1aa235d55b05e1", "https://git.sr.ht/~ehmry/nim_taps >= 20240405"