diff --git a/.github/workflows/build-machines-and-homes.yml b/.github/workflows/build-machines-and-homes.yml
index c955639..290761f 100644
--- a/.github/workflows/build-machines-and-homes.yml
+++ b/.github/workflows/build-machines-and-homes.yml
@@ -74,7 +74,7 @@ jobs:
         run: |
           package=".#nixosConfigurations."${{ matrix.machine }}".config.system.build.toplevel"
           nix run git+https://git.cy7.sh/cy/nixcp.git -- \
-            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=none' \
+            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=zstd' \
             -u https://nix-community.cachix.org \
             -u https://nixcache.web.cy7.sh \
             $package
@@ -143,7 +143,7 @@ jobs:
         run: |
           package=".#homeConfigurations."${{ matrix.home }}".activationPackage"
           nix run git+https://git.cy7.sh/cy/nixcp.git -- \
-            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=none' \
+            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=zstd' \
             -u https://nix-community.cachix.org \
             -u https://nixcache.web.cy7.sh \
             $package
diff --git a/.github/workflows/build-packages.yml b/.github/workflows/build-packages.yml
index c188482..4f76a1d 100644
--- a/.github/workflows/build-packages.yml
+++ b/.github/workflows/build-packages.yml
@@ -62,7 +62,7 @@ jobs:
         if: '!cancelled()'
         run: |
           nix run git+https://git.cy7.sh/cy/nixcp.git -- \
-            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=none' \
+            --to 's3://nixcache?endpoint=s3.cy7.sh&secret-key=/home/runner/cache-priv-key.pem&compression=zstd' \
             -u https://nix-community.cachix.org \
             -u https://nixcache.web.cy7.sh \
             "${{ matrix.package }}"