diff --git a/.github/actions/setup-build-env/action.yml b/.github/actions/setup-build-env/action.yml
index 285601406..1c2386b06 100644
--- a/.github/actions/setup-build-env/action.yml
+++ b/.github/actions/setup-build-env/action.yml
@@ -28,7 +28,7 @@ runs:
       shell: bash
       run: |
         echo "${{ github.workspace }}/.local/bin" >> $GITHUB_PATH
-        echo "$(brew --prefix llvm)/bin" >> $GITHUB_PATH
+        echo "$(brew --prefix llvm@20)/bin" >> $GITHUB_PATH
         echo "$(brew --prefix bison)/bin" >> $GITHUB_PATH
         echo "$(brew --prefix flex)/bin" >> $GITHUB_PATH
         echo "procs=$(sysctl -n hw.ncpu)" >> $GITHUB_ENV
diff --git a/Brewfile b/Brewfile
index a4efff9a2..d2c1063ca 100644
--- a/Brewfile
+++ b/Brewfile
@@ -10,5 +10,5 @@ brew "tcl-tk"
 brew "xdot"
 brew "bash"
 brew "boost-python3"
-brew "llvm@19"
+brew "llvm@20"
 brew "lld"