diff --git a/Formula/g/graph-tool.rb b/Formula/g/graph-tool.rb
index 82c05a65a3e9..30a9508c6bcc 100644
--- a/Formula/g/graph-tool.rb
+++ b/Formula/g/graph-tool.rb
@@ -3,8 +3,8 @@ class GraphTool < Formula
 
   desc "Efficient network analysis for Python 3"
   homepage "https://graph-tool.skewed.de/"
-  url "https://downloads.skewed.de/graph-tool/graph-tool-2.79.tar.bz2"
-  sha256 "52a254942e75ed3070dea70e692ae101877bbef1009e43ec62fe1806a8de0154"
+  url "https://downloads.skewed.de/graph-tool/graph-tool-2.80.tar.bz2"
+  sha256 "c1a70e075dbe728fad25dc3f5a9a9597880a6d6ff68435b91d21f0b44ef8dbe6"
   license "LGPL-3.0-or-later"
 
   livecheck do
@@ -13,26 +13,25 @@ class GraphTool < Formula
   end
 
   bottle do
-    rebuild 1
-    sha256                               arm64_sequoia: "4b9ebfea60e076eccd963da33a8d3f1fc77cf92a126c38ac53cd6d6195fcf1bc"
-    sha256                               arm64_sonoma:  "c1cc89698b066ba392faac276c3594a9f912ec0aa33e4ee57672b7cbb9ec3ba8"
-    sha256                               arm64_ventura: "ac50c767078808217e6cd8ec58d090585851a7dc048db970853fabbe9443cd66"
-    sha256                               sonoma:        "7cd95c5ca3ad75b3765409764892577579f277b58619b6fa94df2b7d9755e248"
-    sha256                               ventura:       "ad558633c9fc556d3e979a9b89148b689afdcb40ff069bd115093afb58442e60"
-    sha256 cellar: :any_skip_relocation, x86_64_linux:  "9dd968dfe02c6d0f124652348ec33f4e42f3a7f1f4cd622751b4a4bcda28974b"
+    sha256                               arm64_sequoia: "f8312ee277316d2541abce5195a4f7afb50121a48108a63d5befd47888160175"
+    sha256                               arm64_sonoma:  "afe92a1713d4b26d830d8d37dd6d34f519c03ce98f38ff2612a9512c6897a09f"
+    sha256                               arm64_ventura: "a1d72270290cc4545f1c324dcf36e9f82a93d327a06c6c03986288962e752006"
+    sha256                               sonoma:        "8af3886cfcb8afa48dad5c12f786284713e56007903a30aa44811db493cd09c7"
+    sha256                               ventura:       "0245644ae50faaa755440145fa7ed164db9629cd882614bb52834264c8e7573d"
+    sha256 cellar: :any_skip_relocation, x86_64_linux:  "95965b45ede426cc12f96b0d8713a98f334ac36bd92919ff26352c77d50272d8"
   end
 
+  depends_on "google-sparsehash" => :build
   depends_on "ninja" => :build
   depends_on "pkgconf" => :build
+
   depends_on "boost"
   depends_on "boost-python3"
   depends_on "cairomm@1.14"
   depends_on "cgal"
   depends_on "freetype"
   depends_on "gmp"
-  depends_on "google-sparsehash"
   depends_on "gtk+3"
-  depends_on macos: :mojave # for C++17
   depends_on "numpy"
   depends_on "pillow"
   depends_on "py3cairo"
@@ -46,6 +45,7 @@ class GraphTool < Formula
 
   on_macos do
     depends_on "cairo"
+    depends_on "libomp"
     depends_on "libsigc++@2"
   end
 
@@ -134,6 +134,13 @@ def install
     # Linux build is not thread-safe.
     ENV.deparallelize unless OS.mac?
 
+    # Enable openmp
+    if OS.mac?
+      ENV.append_to_cflags "-Xpreprocessor -fopenmp"
+      ENV.append "LDFLAGS", "-L#{Formula["libomp"].opt_lib} -lomp"
+      ENV.append "CPPFLAGS", "-I#{Formula["libomp"].opt_include}"
+    end
+
     args = %W[
       PYTHON=#{python}
       --with-python-module-path=#{prefix/site_packages}