diff --git a/packages/bcp/package.json b/packages/bcp/package.json
index d9987d11..e7a129fb 100644
--- a/packages/bcp/package.json
+++ b/packages/bcp/package.json
@@ -39,9 +39,9 @@
   },
   "dependencies": {
     "@cosmwasm/sdk": "^0.0.8",
-    "@iov/bcp": "^2.0.2",
-    "@iov/crypto": "^2.0.2",
-    "@iov/encoding": "^2.0.2",
+    "@iov/bcp": "^2.1.0",
+    "@iov/crypto": "^2.1.0",
+    "@iov/encoding": "^2.1.0",
     "@iov/stream": "^2.0.2",
     "@iov/utils": "^2.0.2",
     "bn.js": "^5.1.1",
@@ -50,7 +50,7 @@
     "xstream": "^11.11.0"
   },
   "devDependencies": {
-    "@iov/keycontrol": "^2.0.2",
+    "@iov/keycontrol": "^2.1.0",
     "@types/bn.js": "^4.11.6"
   }
 }
diff --git a/packages/bcp/src/cosmwasmconnection.spec.ts b/packages/bcp/src/cosmwasmconnection.spec.ts
index 70b8bdb0..55db4b2e 100644
--- a/packages/bcp/src/cosmwasmconnection.spec.ts
+++ b/packages/bcp/src/cosmwasmconnection.spec.ts
@@ -1,4 +1,4 @@
-import { decodeSignature, makeSecp256k1SignatureFromFixedLength } from "@cosmwasm/sdk";
+import { decodeSignature } from "@cosmwasm/sdk";
 import {
   Account,
   Address,
@@ -17,7 +17,7 @@ import {
   TransactionState,
   UnsignedTransaction,
 } from "@iov/bcp";
-import { Random, Secp256k1, Sha256 } from "@iov/crypto";
+import { Random, Secp256k1, Secp256k1Signature, Sha256 } from "@iov/crypto";
 import { Bech32, Encoding } from "@iov/encoding";
 import { HdPaths, Secp256k1HdWallet, UserProfile } from "@iov/keycontrol";
 import { assert } from "@iov/utils";
@@ -475,7 +475,7 @@ describe("CosmWasmConnection", () => {
       const { pubkey, signature } = decodeSignature(encodeFullSignature(signatures[0]));
       const prehashed = new Sha256(signBytes).digest();
       const valid = await Secp256k1.verifySignature(
-        makeSecp256k1SignatureFromFixedLength(signature),
+        Secp256k1Signature.fromFixedLength(signature),
         prehashed,
         pubkey,
       );
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 2511c0db..d4c5763b 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -37,8 +37,8 @@
   ],
   "dependencies": {
     "@cosmwasm/sdk": "^0.0.8",
-    "@iov/crypto": "^2.0.2",
-    "@iov/encoding": "^2.0.2",
+    "@iov/crypto": "^2.1.0",
+    "@iov/encoding": "^2.1.0",
     "@iov/utils": "^2.0.2",
     "argparse": "^1.0.10",
     "babylon": "^6.18.0",
diff --git a/packages/faucet/package.json b/packages/faucet/package.json
index 7484e9aa..cdfa2398 100644
--- a/packages/faucet/package.json
+++ b/packages/faucet/package.json
@@ -36,10 +36,10 @@
   },
   "dependencies": {
     "@cosmwasm/bcp": "^0.0.8",
-    "@iov/bcp": "^2.0.2",
-    "@iov/crypto": "^2.0.2",
-    "@iov/encoding": "^2.0.2",
-    "@iov/keycontrol": "^2.0.2",
+    "@iov/bcp": "^2.1.0",
+    "@iov/crypto": "^2.1.0",
+    "@iov/encoding":"^2.1.0",
+    "@iov/keycontrol": "^2.1.0",
     "@iov/utils": "^2.0.2",
     "@koa/cors": "^3.0.0",
     "axios": "^0.19.0",
diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index d76cb01f..de09ac68 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -38,15 +38,13 @@
     "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.web.config.js"
   },
   "dependencies": {
-    "@iov/crypto": "^2.0.2",
-    "@iov/encoding": "^2.0.2",
+    "@iov/crypto": "^2.1.0",
+    "@iov/encoding": "^2.1.0",
     "@iov/utils": "^2.0.2",
     "axios": "^0.19.0",
-    "bn.js": "^5.1.1",
     "pako": "^1.0.11"
   },
   "devDependencies": {
-    "@types/bn.js": "^4.11.6",
     "@types/pako": "^1.0.1",
     "readonly-date": "^1.0.0"
   }
diff --git a/packages/sdk/src/index.ts b/packages/sdk/src/index.ts
index 4611ed78..850a3294 100644
--- a/packages/sdk/src/index.ts
+++ b/packages/sdk/src/index.ts
@@ -24,11 +24,7 @@ export {
   encodeSecp256k1Pubkey,
 } from "./pubkey";
 export { findSequenceForSignedTx } from "./sequence";
-export {
-  encodeSecp256k1Signature,
-  decodeSignature,
-  makeSecp256k1SignatureFromFixedLength,
-} from "./signature";
+export { encodeSecp256k1Signature, decodeSignature } from "./signature";
 export {
   SigningCallback,
   SigningCosmWasmClient,
diff --git a/packages/sdk/src/pen.spec.ts b/packages/sdk/src/pen.spec.ts
index 68a514c2..7769893e 100644
--- a/packages/sdk/src/pen.spec.ts
+++ b/packages/sdk/src/pen.spec.ts
@@ -1,8 +1,8 @@
-import { Secp256k1, Sha256 } from "@iov/crypto";
+import { Secp256k1, Secp256k1Signature, Sha256 } from "@iov/crypto";
 import { Encoding } from "@iov/encoding";
 
 import { Secp256k1Pen } from "./pen";
-import { decodeSignature, makeSecp256k1SignatureFromFixedLength } from "./signature";
+import { decodeSignature } from "./signature";
 
 const { fromHex } = Encoding;
 
@@ -37,7 +37,7 @@ describe("Sec256k1Pen", () => {
       const { pubkey, signature } = decodeSignature(await pen.sign(data));
 
       const valid = await Secp256k1.verifySignature(
-        makeSecp256k1SignatureFromFixedLength(signature),
+        Secp256k1Signature.fromFixedLength(signature),
         new Sha256(data).digest(),
         pubkey,
       );
diff --git a/packages/sdk/src/sequence.ts b/packages/sdk/src/sequence.ts
index 9c2ef647..dbdd36a8 100644
--- a/packages/sdk/src/sequence.ts
+++ b/packages/sdk/src/sequence.ts
@@ -1,7 +1,7 @@
-import { Secp256k1, Sha256 } from "@iov/crypto";
+import { Secp256k1, Secp256k1Signature, Sha256 } from "@iov/crypto";
 
 import { makeSignBytes } from "./encoding";
-import { decodeSignature, makeSecp256k1SignatureFromFixedLength } from "./signature";
+import { decodeSignature } from "./signature";
 import { CosmosSdkTx } from "./types";
 
 /**
@@ -26,7 +26,7 @@ export async function findSequenceForSignedTx(
   if (!firstSignature) throw new Error("Signature missing in tx");
 
   const { pubkey, signature } = decodeSignature(firstSignature);
-  const secp256keSignature = makeSecp256k1SignatureFromFixedLength(signature);
+  const secp256keSignature = Secp256k1Signature.fromFixedLength(signature);
 
   for (let s = min; s < upperBound; s++) {
     // console.log(`Trying sequence ${s}`);
diff --git a/packages/sdk/src/signature.ts b/packages/sdk/src/signature.ts
index daa2750c..d31eb119 100644
--- a/packages/sdk/src/signature.ts
+++ b/packages/sdk/src/signature.ts
@@ -1,6 +1,4 @@
-import { Secp256k1Signature } from "@iov/crypto";
 import { Encoding } from "@iov/encoding";
-import BN from "bn.js";
 
 import { encodeSecp256k1Pubkey } from "./pubkey";
 import { pubkeyType, StdSignature } from "./types";
@@ -39,10 +37,3 @@ export function decodeSignature(
       throw new Error("Unsupported pubkey type");
   }
 }
-
-// TODO: use Secp256k1Signature.fromFixedLength once this is published https://github.com/iov-one/iov-core/pull/1401
-export function makeSecp256k1SignatureFromFixedLength(signature: Uint8Array): Secp256k1Signature {
-  const unpaddedR = Uint8Array.from(new BN(signature.slice(0, 32)).toArray());
-  const unpaddedS = Uint8Array.from(new BN(signature.slice(32, 64)).toArray());
-  return new Secp256k1Signature(unpaddedR, unpaddedS);
-}
diff --git a/packages/sdk/types/index.d.ts b/packages/sdk/types/index.d.ts
index b74b8428..2d158036 100644
--- a/packages/sdk/types/index.d.ts
+++ b/packages/sdk/types/index.d.ts
@@ -23,11 +23,7 @@ export {
   encodeSecp256k1Pubkey,
 } from "./pubkey";
 export { findSequenceForSignedTx } from "./sequence";
-export {
-  encodeSecp256k1Signature,
-  decodeSignature,
-  makeSecp256k1SignatureFromFixedLength,
-} from "./signature";
+export { encodeSecp256k1Signature, decodeSignature } from "./signature";
 export {
   SigningCallback,
   SigningCosmWasmClient,
diff --git a/packages/sdk/types/signature.d.ts b/packages/sdk/types/signature.d.ts
index 16c7e432..c23e7167 100644
--- a/packages/sdk/types/signature.d.ts
+++ b/packages/sdk/types/signature.d.ts
@@ -1,4 +1,3 @@
-import { Secp256k1Signature } from "@iov/crypto";
 import { StdSignature } from "./types";
 /**
  * Takes a binary pubkey and signature to create a signature object
@@ -13,4 +12,3 @@ export declare function decodeSignature(
   readonly pubkey: Uint8Array;
   readonly signature: Uint8Array;
 };
-export declare function makeSecp256k1SignatureFromFixedLength(signature: Uint8Array): Secp256k1Signature;
diff --git a/yarn.lock b/yarn.lock
index 39e36fe2..08c32978 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -92,23 +92,23 @@
     unique-filename "^1.1.1"
     which "^1.3.1"
 
-"@iov/bcp@^2.0.2":
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/@iov/bcp/-/bcp-2.0.2.tgz#d63a996e0c2c7eff218f3dfca44dbcfaaf80ed0b"
-  integrity sha512-7uvDXh74CbU+xpIcLQDS0qNbvD1YDQXI+YlVMWMLQdnltAxGetKPA9vDI/rcl4rjYXkGbXWjXvFYBxftj5S5QQ==
+"@iov/bcp@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@iov/bcp/-/bcp-2.1.0.tgz#d7c092a31e78dcdb80602e45f5fcb7c2f92e1417"
+  integrity sha512-FYpB8MX98aln7MFW6Pn1jA9uPVSYazigm5v5G3jM18aryusKroTindgRJvsRGhgr6VE5YIppohSfYNkA6WhLsg==
   dependencies:
-    "@iov/crypto" "^2.0.2"
-    "@iov/encoding" "^2.0.2"
+    "@iov/crypto" "^2.1.0"
+    "@iov/encoding" "^2.1.0"
     "@iov/stream" "^2.0.2"
     type-tagger "^1.0.0"
     xstream "^11.10.0"
 
-"@iov/crypto@^2.0.2":
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/@iov/crypto/-/crypto-2.0.2.tgz#22da5ca5c76e2f8e1a8e592195aa754584e1c1d6"
-  integrity sha512-UeBleADtU4RMPGjo5RmF+vAW0krV+TZtJetbY6i05J/cRWElKx/FxLvChRO4HciyE7KBKMTZmt+erKzpr/D9ZA==
+"@iov/crypto@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@iov/crypto/-/crypto-2.1.0.tgz#10e91b6692e154958c11626dfd096a80e8a481a4"
+  integrity sha512-jnb4XuK50admolm7fBxOcxfAW2TO+wYrZlhDWiMETItY/Y5gNNa1zaDSO2wNIjjfGng+8nQ1yqnNhqy7busV2Q==
   dependencies:
-    "@iov/encoding" "^2.0.2"
+    "@iov/encoding" "^2.1.0"
     bip39 "^3.0.2"
     bn.js "^4.11.8"
     elliptic "^6.4.0"
@@ -120,24 +120,24 @@
     type-tagger "^1.0.0"
     unorm "^1.5.0"
 
-"@iov/encoding@^2.0.2":
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/@iov/encoding/-/encoding-2.0.2.tgz#e83330aa8dcf0de422a1599a6d08653f74275f8e"
-  integrity sha512-IlqBGZz4iOz6QjYJB0rCVCiaZojOJpSjapT8575M8BZ7K40jLVe1DaSxGFF0G8orY9I9Kc/7fGMvr0a2wR3HAw==
+"@iov/encoding@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@iov/encoding/-/encoding-2.1.0.tgz#434203c39874c68bc1d96e1278251f0feb23be07"
+  integrity sha512-5IOdLO7Xg/uRykuiCqeMYghQ3IjWDtGxv7NTWXkgpHuna0aewx43mRpT2NPCpOZd1tpuorDtQ7/zbDNRaIIF/w==
   dependencies:
     base64-js "^1.3.0"
     bech32 "^1.1.3"
     bn.js "^4.11.8"
     readonly-date "^1.0.0"
 
-"@iov/keycontrol@^2.0.2":
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/@iov/keycontrol/-/keycontrol-2.0.2.tgz#10113d5d8223912f6325f1fc68746852fd1dec23"
-  integrity sha512-XubfYpNFr/xwGQC7e0VFc9oug4S5/muzIgQJRDxGcGNyE1YhQbfAzYLfxC7Th0Dq5rRui3MKWhLehYydqNxvvw==
+"@iov/keycontrol@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@iov/keycontrol/-/keycontrol-2.1.0.tgz#ba67337a9b50e68fcca2bd54563602d7667c6f76"
+  integrity sha512-mZm0ENishX5ho8w6yL7MQN7tQOphptCgOodH0YUNwtOeNjSgczjYuOoKvcjWVsn+KGNOV7qDoRWRsxUWV50jtw==
   dependencies:
-    "@iov/bcp" "^2.0.2"
-    "@iov/crypto" "^2.0.2"
-    "@iov/encoding" "^2.0.2"
+    "@iov/bcp" "^2.1.0"
+    "@iov/crypto" "^2.1.0"
+    "@iov/encoding" "^2.1.0"
     "@iov/stream" "^2.0.2"
     "@types/abstract-leveldown" "^5.0.1"
     "@types/levelup" "^3.1.0"