diff --git a/Formula/tezos-accuser-011-PtHangz2.rb b/Formula/tezos-accuser-011-PtHangz2.rb
index ffd9ce606..49caf58fe 100644
--- a/Formula/tezos-accuser-011-PtHangz2.rb
+++ b/Formula/tezos-accuser-011-PtHangz2.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosAccuser011Pthangz2.version}/"
-    sha256 cellar: :any, big_sur: "793616eb1d79459eab5303bf193421b8829bef11d541db4d369abb75d2c93532"
-    sha256 cellar: :any, catalina: "c1a964093c606926305ac0ae1b6ea9189cd96a6e7c09dd47acdf6a914e71ae1f"
-    sha256 cellar: :any, arm64_big_sur: "d98c8c477142a258217b2bb693567300a7ad58e6feb3ece5f1d8a7bd5c9d91c2"
   end
 
   def make_deps
diff --git a/Formula/tezos-accuser-012-Psithaca.rb b/Formula/tezos-accuser-012-Psithaca.rb
index f61b31bcb..567f5d40d 100644
--- a/Formula/tezos-accuser-012-Psithaca.rb
+++ b/Formula/tezos-accuser-012-Psithaca.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosAccuser012Psithaca.version}/"
-    sha256 cellar: :any, big_sur: "7482453e303c9f5e3e69ea2927ecbf46d47fe14fb3c4e99daff0e48ee560b812"
-    sha256 cellar: :any, catalina: "bb2c7d979897728296f34e35ff14f2f2ba610aa7b4a9d64d42ac3c7615c1b8f0"
-    sha256 cellar: :any, arm64_big_sur: "0db7e9e561da6e3d7a61161cbec7f72ece1ba62e61cd957afea107ef31c8af3f"
   end
 
   def make_deps
diff --git a/Formula/tezos-admin-client.rb b/Formula/tezos-admin-client.rb
index f186d4766..5b45078a2 100644
--- a/Formula/tezos-admin-client.rb
+++ b/Formula/tezos-admin-client.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosAdminClient.version}/"
-    sha256 cellar: :any, big_sur: "3d070f65ed6fe77eec99337b9e24faa359aaa08f122b7a3f8cb77b5b26d6379a"
-    sha256 cellar: :any, catalina: "7ef988653032cf21b4b283123e1873b66a46b5e1d17c1daf413204d24588b8a2"
-    sha256 cellar: :any, arm64_big_sur: "b79b33de7c42f86b9c5c26e3d2857f44bbe653604f0a77eeb8ce12471fe3c0ae"
   end
 
   def make_deps
diff --git a/Formula/tezos-baker-011-PtHangz2.rb b/Formula/tezos-baker-011-PtHangz2.rb
index b966d9248..d13d4c42b 100644
--- a/Formula/tezos-baker-011-PtHangz2.rb
+++ b/Formula/tezos-baker-011-PtHangz2.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosBaker011Pthangz2.version}/"
-    sha256 cellar: :any, big_sur: "fb52e4f581f7cc8580be8f91c485212635664b55d842505bb98d42a943905125"
-    sha256 cellar: :any, catalina: "c8493f92e3c462a36f19905be2c342af9ed1a3657e0343bd94a9dea95d4ccadb"
-    sha256 cellar: :any, arm64_big_sur: "2d748cf7c93add9f5c179233c0204ff72983d715b42e5e2d35d91e1c2bf759f8"
   end
 
   def make_deps
diff --git a/Formula/tezos-baker-012-Psithaca.rb b/Formula/tezos-baker-012-Psithaca.rb
index 2b05c196d..96dc2237a 100644
--- a/Formula/tezos-baker-012-Psithaca.rb
+++ b/Formula/tezos-baker-012-Psithaca.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosBaker012Psithaca.version}/"
-    sha256 cellar: :any, big_sur: "22b3a2bcc83335d4cf538b96f4cc4cce8d301a98a5c42d3b899e886c0c255cce"
-    sha256 cellar: :any, catalina: "52e969d49b2d5396df162cfab808cdac6b0048b4437edeb475686cbd22104348"
-    sha256 cellar: :any, arm64_big_sur: "76191aae7c364365707df775458257cf46bc25fc6913a27f3037d5e7310bf8a4"
   end
 
   def make_deps
diff --git a/Formula/tezos-client.rb b/Formula/tezos-client.rb
index e37edb8ce..3ef605297 100644
--- a/Formula/tezos-client.rb
+++ b/Formula/tezos-client.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosClient.version}/"
-    sha256 cellar: :any, big_sur: "ef719a065d95935f3ecab6462088341d05243ef37801b9255e50679ed1e5ee43"
-    sha256 cellar: :any, catalina: "28de6e30561ffce0d6ef4811a1085b2c2e8b4ec2a1a3db5fd48a2980ad6a1412"
-    sha256 cellar: :any, arm64_big_sur: "e95e99633e9f8d37ac0a9fa9c33ffc5ea2e6e9a154a12cd6170494fd460aeeb0"
   end
 
   def make_deps
diff --git a/Formula/tezos-codec.rb b/Formula/tezos-codec.rb
index 4c97e8d09..d575ac868 100644
--- a/Formula/tezos-codec.rb
+++ b/Formula/tezos-codec.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosCodec.version}/"
-    sha256 cellar: :any, big_sur: "e4cdfbcf42590ddbe152fcb6c0ce84ddf673317c47e3bad0f40982b7a56f6805"
-    sha256 cellar: :any, catalina: "17b51c17e6ffb620c1ebeb6ae7ea9f0ede12d13846c77f9f96e279a68e43e923"
-    sha256 cellar: :any, arm64_big_sur: "b3ebd24859f786d8c069f81c2a382ba52e5d0231df83135b21d9071cc1ea2599"
   end
 
   def make_deps
diff --git a/Formula/tezos-endorser-011-PtHangz2.rb b/Formula/tezos-endorser-011-PtHangz2.rb
index 156ff7f46..ab43cb95b 100644
--- a/Formula/tezos-endorser-011-PtHangz2.rb
+++ b/Formula/tezos-endorser-011-PtHangz2.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -28,9 +28,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosEndorser011Pthangz2.version}/"
-    sha256 cellar: :any, big_sur: "bc3e823e40e7811bd4339c8dabd2cc0cd6ef5b4219bfd6514279a8cce521ed05"
-    sha256 cellar: :any, catalina: "dea3f61b94751ebae2b6035a17e9fa5d6b85dec3865b202fb67967f26cc1e53b"
-    sha256 cellar: :any, arm64_big_sur: "b6baf5c2120c53c54487b7f13d2802467fc3e6c4ae780e2cede1239c64202db6"
   end
 
   def make_deps
diff --git a/Formula/tezos-node-hangzhounet.rb b/Formula/tezos-node-hangzhounet.rb
index 598fcff8a..a3a0ab107 100644
--- a/Formula/tezos-node-hangzhounet.rb
+++ b/Formula/tezos-node-hangzhounet.rb
@@ -4,7 +4,7 @@
 
 class TezosNodeHangzhounet < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-node"
diff --git a/Formula/tezos-node-ithacanet.rb b/Formula/tezos-node-ithacanet.rb
index cf2c8afda..ec28eb980 100644
--- a/Formula/tezos-node-ithacanet.rb
+++ b/Formula/tezos-node-ithacanet.rb
@@ -4,7 +4,7 @@
 
 class TezosNodeIthacanet < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-node"
diff --git a/Formula/tezos-node-mainnet.rb b/Formula/tezos-node-mainnet.rb
index f5d15514e..985d94b21 100644
--- a/Formula/tezos-node-mainnet.rb
+++ b/Formula/tezos-node-mainnet.rb
@@ -4,7 +4,7 @@
 
 class TezosNodeMainnet < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-node"
diff --git a/Formula/tezos-node.rb b/Formula/tezos-node.rb
index aec81234c..aee572c6b 100644
--- a/Formula/tezos-node.rb
+++ b/Formula/tezos-node.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosNode.version}/"
-    sha256 cellar: :any, big_sur: "ab9509eada388cc7331b858ca51b53dd7c6be360d2393f4a1cde51466aa27a35"
-    sha256 cellar: :any, catalina: "f43414dceedad367cd937eb3a5dba23a27ede1caab54be67fa049f5005b2d241"
-    sha256 cellar: :any, arm64_big_sur: "593dccdcfcde55fc57a8c95715169a142478ee86f02c27055dbea30cfceb4e36"
   end
 
   def make_deps
diff --git a/Formula/tezos-sandbox.rb b/Formula/tezos-sandbox.rb
index 5cf0e28ae..2741d679f 100644
--- a/Formula/tezos-sandbox.rb
+++ b/Formula/tezos-sandbox.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosSandbox.version}/"
-    sha256 cellar: :any, big_sur: "0912fc8b78dfb4142beaf69183be38e6c97b88354df36cc98827fd0eb9d3961b"
-    sha256 cellar: :any, catalina: "365453d6c764adeb4cec3fa9b1e259864106b6f73fe1ab10642b4cf2c9e9ffc2"
-    sha256 cellar: :any, arm64_big_sur: "0f27b3f4bd300d9627fd86096035b3822bf5f5e94fc167ea556d1631a0540d47"
   end
 
   def make_deps
diff --git a/Formula/tezos-signer-http.rb b/Formula/tezos-signer-http.rb
index 6120a6ed7..5adf0abad 100644
--- a/Formula/tezos-signer-http.rb
+++ b/Formula/tezos-signer-http.rb
@@ -4,7 +4,7 @@
 
 class TezosSignerHttp < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-signer"
diff --git a/Formula/tezos-signer-https.rb b/Formula/tezos-signer-https.rb
index 9064f4a62..628f9fe8e 100644
--- a/Formula/tezos-signer-https.rb
+++ b/Formula/tezos-signer-https.rb
@@ -4,7 +4,7 @@
 
 class TezosSignerHttps < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-signer"
diff --git a/Formula/tezos-signer-tcp.rb b/Formula/tezos-signer-tcp.rb
index 84a46ef1d..fc025bb3d 100644
--- a/Formula/tezos-signer-tcp.rb
+++ b/Formula/tezos-signer-tcp.rb
@@ -4,7 +4,7 @@
 
 class TezosSignerTcp < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-signer"
diff --git a/Formula/tezos-signer-unix.rb b/Formula/tezos-signer-unix.rb
index 25ef615ce..b8e4072df 100644
--- a/Formula/tezos-signer-unix.rb
+++ b/Formula/tezos-signer-unix.rb
@@ -4,7 +4,7 @@
 
 class TezosSignerUnix < Formula
   url "file:///dev/null"
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   bottle :unneeded
   depends_on "tezos-signer"
diff --git a/Formula/tezos-signer.rb b/Formula/tezos-signer.rb
index bb378780f..d13c0a164 100644
--- a/Formula/tezos-signer.rb
+++ b/Formula/tezos-signer.rb
@@ -10,9 +10,9 @@ class << self
   end
   homepage "https://gitlab.com/tezos/tezos"
 
-  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0-rc2", :shallow => false
+  url "https://gitlab.com/tezos/tezos.git", :tag => "v12.0", :shallow => false
 
-  version "v12.0-rc2-1"
+  version "v12.0-1"
 
   build_dependencies = %w[pkg-config autoconf rsync wget rustup-init]
   build_dependencies.each do |dependency|
@@ -27,9 +27,6 @@ class << self
 
   bottle do
     root_url "https://github.com/serokell/tezos-packaging/releases/download/#{TezosSigner.version}/"
-    sha256 cellar: :any, big_sur: "eec08f340baabd8a3b2d6810a29c7eed6715ea581fd13db07a59e606da25af3c"
-    sha256 cellar: :any, catalina: "09c7ce9145558f7fc639f73b04c5b9df69ddbf97e7d6298e1bff17d08cd0b6ce"
-    sha256 cellar: :any, arm64_big_sur: "446cfe397a6e63ef1fc4044a287f8f01b476a93dc8fdf3a654c2d283613a6e11"
   end
 
   def make_deps
diff --git a/nix/build/hacks.nix b/nix/build/hacks.nix
index b5321cfa0..73343b02d 100644
--- a/nix/build/hacks.nix
+++ b/nix/build/hacks.nix
@@ -68,18 +68,18 @@ rec {
     '';
   });
 
-  irmin = osuper.irmin.versions."2.9.0".overrideAttrs (o: {
+  irmin = osuper.irmin.versions."2.9.1".overrideAttrs (o: {
     useDune2 = true;
   });
-  irmin-pack = osuper.irmin-pack.versions."2.9.0".overrideAttrs ( o: {
+  irmin-pack = osuper.irmin-pack.versions."2.9.1".overrideAttrs ( o: {
     buildPhase = ''
       runHook preBuild
       dune build -p irmin-pack -j $NIX_BUILD_CORES
       runHook postBuild
     '';
   });
-  irmin-layers = osuper.irmin-layers.versions."2.9.0";
-  ppx_irmin = osuper.ppx_irmin.versions."2.9.0";
+  irmin-layers = osuper.irmin-layers.versions."2.9.1";
+  ppx_irmin = osuper.ppx_irmin.versions."2.9.1";
 
   index = osuper.index.versions."1.5.0";
   progress = osuper.progress.versions."0.2.1".overrideAttrs (o: {
@@ -95,13 +95,13 @@ rec {
 
   lwt-canceler = osuper.lwt-canceler.versions."0.3";
   data-encoding = osuper.data-encoding.versions."0.4";
-  json-data-encoding = osuper.json-data-encoding.versions."0.10";
-  json-data-encoding-bson = osuper.json-data-encoding-bson.versions."0.10";
+  json-data-encoding = osuper.json-data-encoding.versions."0.11";
+  json-data-encoding-bson = osuper.json-data-encoding-bson.versions."0.11";
   ocamlformat = osuper.ocamlformat.overrideAttrs (o: {
     buildInputs = o.buildInputs ++ [ alcotest ocp-indent ];
   });
 
-  bls12-381 = osuper.bls12-381.versions."1.1.0".overrideAttrs (o:
+  bls12-381 = osuper.bls12-381.versions."1.1.1".overrideAttrs (o:
     rec {
       buildInputs = o.buildInputs ++ [ rustc-bls12-381 ];
       buildPhase = ''
diff --git a/nix/nix/sources.json b/nix/nix/sources.json
index b263e3536..230a53313 100644
--- a/nix/nix/sources.json
+++ b/nix/nix/sources.json
@@ -36,10 +36,10 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "opam-repository": {
-        "branch": "master",
-        "ref": "master",
+        "branch": "v12-release",
+        "ref": "v12-release",
         "repo": "https://gitlab.com/tezos/opam-repository",
-        "rev": "8ce29151e3b8965bfc74dd8bd114f48df3d5733c",
+        "rev": "049f2433bd7f4b4fb24dc7cb7faa4b9d77589138",
         "type": "git"
     },
     "serokell-nix": {
@@ -56,9 +56,9 @@
     },
     "tezos": {
         "branch": "master",
-        "ref": "refs/tags/v12.0-rc2",
+        "ref": "refs/tags/v12.0",
         "repo": "https://gitlab.com/tezos/tezos",
-        "rev": "7985fafe19003eb6ab495e7d6ce83e747c4e01fc",
+        "rev": "409a3f3fe491ba5c9ac51c7124833f4f70006c07",
         "type": "git"
     }
 }