diff --git a/.appveyor.yml b/.appveyor.yml
index 2fc4386..7725a68 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -19,8 +19,8 @@ configuration:
 
 environment:
     COMMS_BRANCH: v5.2.2
-    COMMSDSL_BRANCH: develop
-    CC_TOOLS_QT_BRANCH: develop
+    COMMSDSL_BRANCH: v6.3
+    CC_TOOLS_QT_BRANCH: v5.1
     matrix:
         - CPP_STD: 11
           QT_MAJOR: 5
diff --git a/.github/workflows/actions_build.yml b/.github/workflows/actions_build.yml
index fc156eb..248a7c2 100644
--- a/.github/workflows/actions_build.yml
+++ b/.github/workflows/actions_build.yml
@@ -4,8 +4,8 @@ on: [push]
 
 env:
   COMMS_BRANCH: v5.2.2
-  COMMSDSL_BRANCH: develop
-  CC_TOOLS_QT_BRANCH: develop
+  COMMSDSL_BRANCH: v6.3
+  CC_TOOLS_QT_BRANCH: v5.1
 
 jobs:
   build_gcc_old_ubuntu_20_04: