diff --git a/pkgs/applications/science/logic/abc/default.nix b/pkgs/applications/science/logic/abc/default.nix
index cbcd452033ca..fe73f4f4d6e2 100644
--- a/pkgs/applications/science/logic/abc/default.nix
+++ b/pkgs/applications/science/logic/abc/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation rec {
   pname   = "abc-verifier";
-  version = "2020.11.24";
+  version = "2021.11.12";
 
   src = fetchFromGitHub {
-    owner  = "yosyshq";
-    repo   = "abc";
-    rev    = "4f5f73d18b137930fb3048c0b385c82fa078db38";
-    sha256 = "0z1kp223kix7i4r7mbj2bzawkdzc55nsgc41m85dmbajl9fsj1m0";
+    owner = "yosyshq";
+    repo  = "abc";
+    rev   = "f6fa2ddcfc89099726d60386befba874c7ac1e0d";
+    hash  = "sha256-0rvMPZ+kL0m/GjlCLx3eXYQ0osQ2wQiS3+csqPl3U9s=";
   };
 
   nativeBuildInputs = [ cmake ];
diff --git a/pkgs/development/compilers/yosys/default.nix b/pkgs/development/compilers/yosys/default.nix
index 56e0dc3b57d6..4101f06a3480 100644
--- a/pkgs/development/compilers/yosys/default.nix
+++ b/pkgs/development/compilers/yosys/default.nix
@@ -34,13 +34,13 @@
 
 stdenv.mkDerivation rec {
   pname   = "yosys";
-  version = "0.10+1";
+  version = "0.11+52";
 
   src = fetchFromGitHub {
-    owner  = "YosysHQ";
-    repo   = "yosys";
-    rev    = "7a7df9a3b4996b17bb774377483b15de49aa3d9b";
-    sha256 = "sha256-gi/Q6loIQ75NTbS9b/Q8sdrl9NGBDae2+AAGHVYB0WI=";
+    owner = "YosysHQ";
+    repo  = "yosys";
+    rev   = "2be110cb0ba645f95f62ee01b6a6fa46a85d5b26";
+    hash  = "sha256-A1QKu6SbtpJJPF8/LA5SMUP3/+n5giM6rOYdc6vkl90=";
   };
 
   enableParallelBuilding = true;