diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 06f0a474..1dc4c819 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -32,7 +32,7 @@ env:
   TAOX11_ROOT: ${{ github.workspace }}
   INSTALL_PREFIX: ${{ github.workspace }}/stage
   X11_BRANCH: master
-  ACETAOMPC_BRANCH: Latest_ACE7TAO3_Micro
+  ACETAOMPC_BRANCH: Latest_ACE8TAO4_Micro
 
 jobs:
   build:
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 5ad378d4..ac025c2c 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -31,7 +31,7 @@ env:
   RIDL_ROOT: ${{ github.workspace }}/ridl
   TAOX11_ROOT: ${{ github.workspace }}
   X11_BRANCH: master
-  ACETAOMPC_BRANCH: Latest_ACE7TAO3_Micro
+  ACETAOMPC_BRANCH: Latest_ACE8TAO4_Micro
 
 jobs:
   build: