diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c38415f1..780cfb4c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm-cache
+
 jobs:
   build:
     strategy:
diff --git a/.github/workflows/emscripten.yml b/.github/workflows/emscripten.yml
index 0fe66b70..9bba0006 100644
--- a/.github/workflows/emscripten.yml
+++ b/.github/workflows/emscripten.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm-cache
+
 jobs:
   build:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index ad433dc7..729df316 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+env:
+  CPM_SOURCE_CACHE: ${{ github.workspace }}/cpm-cache
+
 jobs:
   build:
     runs-on: ubuntu-latest