diff --git a/.github/workflows/ccpp_mac.yml b/.github/workflows/ccpp_mac.yml
index 32499374e..358592455 100644
--- a/.github/workflows/ccpp_mac.yml
+++ b/.github/workflows/ccpp_mac.yml
@@ -1,6 +1,9 @@
 name: C/C++ CI macos
 
-on: [push]
+on:
+  push:
+    branches:
+      - CI
 
 jobs:
   build:
@@ -13,7 +16,7 @@ jobs:
       run: mkdir deps/build
     - name: cmake deps
       working-directory: ./deps/build
-      run: cmake ..
+      run: cmake .. -DCMAKE_OSX_DEPLOYMENT_TARGET="10.14"
     - name: make deps
       working-directory: ./deps/build
       run: make
@@ -21,7 +24,7 @@ jobs:
       run: mkdir build
     - name: cmake
       working-directory: ./build
-      run: cmake .. -DCMAKE_PREFIX_PATH="$PWD/../deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+      run: cmake .. -DCMAKE_PREFIX_PATH="$PWD/../deps/build/destdir/usr/local" -DCMAKE_OSX_DEPLOYMENT_TARGET="10.14" -DSLIC3R_STATIC=1
     - name: make slic3r
       working-directory: ./build
       run: make slic3r
diff --git a/.github/workflows/ccpp_ubuntu.yml b/.github/workflows/ccpp_ubuntu.yml
index d02e6bdae..becbacc56 100644
--- a/.github/workflows/ccpp_ubuntu.yml
+++ b/.github/workflows/ccpp_ubuntu.yml
@@ -1,6 +1,9 @@
 name: C/C++ CI ubuntu
 
-on: [push]
+on:
+  push:
+    branches:
+      - CI
 
 jobs:
   build:
diff --git a/.github/workflows/ccpp_win.yml b/.github/workflows/ccpp_win.yml
index 1b786b55d..e2b36b22d 100644
--- a/.github/workflows/ccpp_win.yml
+++ b/.github/workflows/ccpp_win.yml
@@ -1,6 +1,9 @@
 name: C/C++ CI windows x64
 
-on: [push]
+on:
+  push:
+    branches:
+      - CI
 
 jobs:
   build: