diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2dc73d0d..24111214 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -197,6 +197,7 @@ jobs:
             cd build
             cmake \
                 -DCMAKE_BUILD_TYPE=Release \
+                -DCMAKE_OSX_DEPLOYMENT_TARGET=10.15 \
                 -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl \
                 -DUSE_PRECOMPILED_HEADERS=${{ matrix.pch }} \
                 ..