diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 182fb0057a471a03176ce15c776711ef5664da2e..6f940489be6864306db17750a969403eb039e520 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -85,14 +85,18 @@ conda:
     - .conda:base
   stage: build
   needs: []
-  script:
-    - conda create --name py310 python=3.10 pip2conda
-    - conda activate py310
-    - pip2conda --all --output environment.txt
+  variables:
+    PYTHON_VERSION: "3.10"
+  before_script:
+    - !reference [".conda:base", before_script]
+    - conda install --name base pip2conda
+    - python -m pip2conda --all --output environment.yml --python ${PYTHON_VERSION} -vv
     - echo "-----------------"
-    - cat environment.txt
+    - cat environment.yml
     - echo "-----------------"
-    - conda install --file environment.txt -c conda-forge
+    - mamba env create --name py${PYTHON_VERSION} --file environment.yml
+    - conda activate py${PYTHON_VERSION}
+  script:
     - python -m pip install .