diff --git a/.docker/build-linux.sh b/.docker/build-linux.sh
index fe392f5ab..8b052f096 100755
--- a/.docker/build-linux.sh
+++ b/.docker/build-linux.sh
@@ -4,6 +4,36 @@ set -ex
 
 export CCACHE_DIR=/ccache
 
+LOCAL_REPO_PATH=/local/repos
+mkdir -p "$LOCAL_REPO_PATH"
+LAST_UPDATE_FILE="$LOCAL_REPO_PATH/last-update"
+
+if [ -f "$LAST_UPDATE_FILE" ] && [ $(find "$LAST_UPDATE_FILE" -mmin -180) ]; then
+    echo "Skipping git repo update because it already ran in the last three hours."
+else
+    echo "Running git repo update."
+
+    for repo in "fmtlib/fmt" \
+                "google/googletest" \
+                "ericniebler/range-v3" \
+                "greg7mdp/parallel-hashmap"; do
+      reponame=$(basename "$repo")
+      cd "$LOCAL_REPO_PATH"
+      if [ -d "$reponame" ]; then
+        cd "$reponame"
+        time git fetch
+      else
+        time git clone "https://github.com/$repo.git"
+      fi
+    done
+
+    touch "$LAST_UPDATE_FILE"
+fi
+
+if [[ "$BUILD_TYPE" != "clang-release-ninja-static" ]]; then
+  export DWARFS_LOCAL_REPO_PATH="$LOCAL_REPO_PATH"
+fi
+
 cd "$HOME"
 
 rm -rf dwarfs dwarfs-*
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 33624751c..59e791013 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -124,6 +124,7 @@ jobs:
             --mount type=bind,source=${GITHUB_WORKSPACE},target=/workspace,readonly \
             --mount type=bind,source=${{ runner.temp }},target=/tmp-runner \
             --mount type=bind,source=/home/mhx/github-ccache,target=/ccache \
+            --mount type=bind,source=/home/mhx/github-local,target=/local \
             --mount type=bind,source=/mnt/opensource/artifacts/dwarfs,target=/artifacts \
             --env BUILD_TYPE=clang-release-ninja-source \
             --env BUILD_ARCH=amd64 \
@@ -233,6 +234,7 @@ jobs:
             --mount type=bind,source=${GITHUB_WORKSPACE},target=/workspace,readonly \
             --mount type=bind,source=${{ runner.temp }},target=/tmp-runner \
             --mount type=bind,source=/home/mhx/github-ccache,target=/ccache \
+            --mount type=bind,source=/home/mhx/github-local,target=/local \
             --env BUILD_FROM_TARBALL=1 \
             --env BUILD_TYPE=${{ matrix.build_type }} \
             --env BUILD_ARCH=${{ matrix.arch }} \
@@ -372,6 +374,7 @@ jobs:
             --mount type=bind,source=${GITHUB_WORKSPACE},target=/workspace,readonly \
             --mount type=bind,source=${{ runner.temp }},target=/tmp-runner \
             --mount type=bind,source=/home/mhx/github-ccache,target=/ccache \
+            --mount type=bind,source=/home/mhx/github-local,target=/local \
             --mount type=bind,source=/mnt/opensource/artifacts/dwarfs,target=/artifacts \
             --env BUILD_TYPE=${{ matrix.build_type }} \
             --env BUILD_ARCH=${{ matrix.arch }} \