diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 10706f2..5156476 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,7 +26,7 @@ on:
 
 env:
   # Use SHA or tag instead of the branch for caching purposes.
-  MONO_TAG: mono-6.12.0.174
+  MONO_TAG: mono-6.12.0.177
   PYTHON_VERSION: 3.9
   # Should match the version that Mono supports.
   EMSDK_VERSION: 1.39.9
diff --git a/README.md b/README.md
index 87d87ad..343f509 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This repository contains scripts for building the Mono runtime to use with Godot
 The scripts are tested against specific versions of the toolchains used by Godot.
 While they may work with other versions, you might have issues applying patches or compiling, so we recommend using the versions below.
 
-- Mono: 6.12.0.174.
+- Mono: 6.12.0.177.
 - Emscripten: 1.39.9.
 - Android: API level 30.