diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 49d9c0677..33df45f29 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - name: install-dependencies
-      run: sudo apt-get install ninja-build libboost-dev libboost-date-time-dev libboost-system-dev libboost-filesystem-dev libboost-thread-dev libboost-chrono-dev libboost-serialization-dev liblog4cpp5-dev gnuradio-dev gr-osmosdr libpugixml-dev libpcap-dev libblas-dev liblapack-dev libarmadillo-dev libgflags-dev libgoogle-glog-dev libgnutls-openssl-dev python-mako python-six libmatio-dev googletest protobuf-compiler libprotobuf-dev
+      run: sudo apt-get update && sudo apt-get install ninja-build libboost-dev libboost-date-time-dev libboost-system-dev libboost-filesystem-dev libboost-thread-dev libboost-chrono-dev libboost-serialization-dev liblog4cpp5-dev gnuradio-dev gr-osmosdr libpugixml-dev libpcap-dev libblas-dev liblapack-dev libarmadillo-dev libgflags-dev libgoogle-glog-dev libgnutls-openssl-dev python-mako python-six libmatio-dev googletest protobuf-compiler libprotobuf-dev
     - name: configure
       run: cd build && cmake -GNinja ..
     - name: build