conda install -c anaconda gcc_linux-64 not being used

I wanted to install updated version of gcc on a server where I do not have root access. I tried conda install -c creditx gcc-7 which was not working. Then I found conda install -c anaconda gcc_linux-64 in fact installs gccv7.3. But after the successful installation, the conda environment still uses the system gcc at /usr/bin/gcc

Please help me so that I can use the gcc v7.3 that I just installed.