diff --git a/package.json b/package.json
index 9960c360cba..b9b42077037 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "scripts": {
     "build:miniconda": "curl -o ~/miniconda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh && bash ~/miniconda.sh -b -p $HOME/miniconda",
-    "build:pygmt": "conda env create -f environment.yml && source activate pygmt && conda install -c conda-forge -y gmt==6.1.1 && make install",
+    "build:pygmt": "conda install mamba -c conda-forge -y && mamba env create -f environment.yml && source activate pygmt && make install",
     "build:docs": "source activate pygmt && cd doc && make all && mv _build/html ../public",
     "build": "export PATH=$HOME/miniconda/bin:$PATH && npm run build:miniconda && npm run build:pygmt && npm run build:docs"
   }