diff --git a/pkgs/development/libraries/science/math/petsc/default.nix b/pkgs/development/libraries/science/math/petsc/default.nix
index a1e9d1e30515..de1c11a98e13 100644
--- a/pkgs/development/libraries/science/math/petsc/default.nix
+++ b/pkgs/development/libraries/science/math/petsc/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "petsc";
-  version = "3.14.2";
+  version = "3.14.3";
 
   src = fetchurl {
     url = "http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-${version}.tar.gz";
-    sha256 = "04vy3qyakikslc58qyv8c9qrwlivix3w6znc993i37cvfg99dch9";
+    sha256 = "sha256-1rdyLNSH8jMkmIg88uHMN3ZXqTHAtzU1adybJEZzJ9M=";
   };
 
   nativeBuildInputs = [ blas gfortran gfortran.cc.lib lapack python ];