diff --git a/.github/workflows/lagom-fuzz.yml b/.github/workflows/lagom-fuzz.yml
index 558cd4ede10..51588d9737c 100644
--- a/.github/workflows/lagom-fuzz.yml
+++ b/.github/workflows/lagom-fuzz.yml
@@ -60,6 +60,7 @@ jobs:
           cmake -GNinja -B tools-build \
             -DBUILD_LAGOM=OFF \
             -DCMAKE_INSTALL_PREFIX=tool-install \
+            -DSERENITY_CACHE_DIR=${{ github.workspace }}/Build/caches \
             -DCMAKE_C_COMPILER=gcc-13 \
             -DCMAKE_CXX_COMPILER=g++-13 \
             -Dpackage=LagomTools
@@ -70,6 +71,7 @@ jobs:
             -DBUILD_LAGOM=ON \
             -DENABLE_FUZZERS_LIBFUZZER=ON \
             -DENABLE_ADDRESS_SANITIZER=ON \
+            -DSERENITY_CACHE_DIR=${{ github.workspace }}/Build/caches \
             -DCMAKE_C_COMPILER=clang \
             -DCMAKE_CXX_COMPILER=clang++ \
             -DCMAKE_PREFIX_PATH=tool-install
diff --git a/.github/workflows/lagom.yml b/.github/workflows/lagom.yml
index f10b2accf9d..ef876686896 100644
--- a/.github/workflows/lagom.yml
+++ b/.github/workflows/lagom.yml
@@ -80,6 +80,7 @@ jobs:
             -DWASM_SPEC_TEST_SKIP_FORMATTING=ON \
             -DENABLE_UNDEFINED_SANITIZER=ON \
             -DENABLE_ADDRESS_SANITIZER=ON \
+            -DSERENITY_CACHE_DIR=${{ github.workspace }}/Build/caches \
             -DCMAKE_C_COMPILER=${{ steps.build-parameters.outputs.host_cc }} \
             -DCMAKE_CXX_COMPILER=${{ steps.build-parameters.outputs.host_cxx }}