diff --git a/.gitlab-ci.Dockerfile.conda b/.gitlab-ci.Dockerfile.conda
index 5b64fc8605117a54f568fa27337265efa54c4dc5..ee4b4e9bd6792e5ccb503cdbc1b46d8484702fe2 100644
--- a/.gitlab-ci.Dockerfile.conda
+++ b/.gitlab-ci.Dockerfile.conda
@@ -18,57 +18,57 @@ COPY gstlal-ugly /gstlal-ugly
 COPY gstlal-inspiral /gstlal-inspiral
 COPY gstlal-burst /gstlal-burst
 
-# Switch to bash shell
+# Make RUN commands use bash:
 SHELL ["/bin/bash", "-c"]
 
 # Install gstlal
-RUN . /opt/conda/etc/profile.d/conda.sh && \
-    conda activate base && \
-    export PREFIX="/opt/conda" && \
+RUN . $CONDA_PREFIX/etc/profile.d/conda.sh && \
+    conda activate build-env && \
+    export PREFIX="$CONDA_PREFIX" && \
     export CONDA_BUILD="1" && \
-    conda activate base && \
+    conda activate build-env && \
     cd /gstlal && \
     ./00init.sh && \
-    ./configure --prefix=/opt/conda --without-doxygen && \
+    ./configure --prefix=$CONDA_PREFIX --without-doxygen && \
     make -j$NUM_CORES && \
     make install -j$NUM_CORES
 RUN rm -rf gstlal
 
 # Install gstlal-ugly
-RUN . /opt/conda/etc/profile.d/conda.sh && \
-    conda activate base && \
-    export PREFIX="/opt/conda" && \
+RUN . $CONDA_PREFIX/etc/profile.d/conda.sh && \
+    conda activate build-env && \
+    export PREFIX="$CONDA_PREFIX" && \
     export CONDA_BUILD="1" && \
-    conda activate base && \
+    conda activate build-env && \
     cd /gstlal-ugly && \
     ./00init.sh && \
-    ./configure --prefix=/opt/conda --without-doxygen --without-gds && \
+    ./configure --prefix=$CONDA_PREFIX --without-doxygen --without-gds && \
     make -j$NUM_CORES && \
     make install -j$NUM_CORES
 RUN rm -rf gstlal-ugly
 
 # Install gstlal-burst
-RUN . /opt/conda/etc/profile.d/conda.sh && \
-    conda activate base && \
-    export PREFIX="/opt/conda" && \
+RUN . $CONDA_PREFIX/etc/profile.d/conda.sh && \
+    conda activate build-env && \
+    export PREFIX="$CONDA_PREFIX" && \
     export CONDA_BUILD="1" && \
-    conda activate base && \
+    conda activate build-env && \
     cd /gstlal-burst && \
     ./00init.sh && \
-    ./configure --prefix=/opt/conda --without-doxygen && \
+    ./configure --prefix=$CONDA_PREFIX --without-doxygen && \
     make -j$NUM_CORES && \
     make install -j$NUM_CORES
 RUN rm -rf gstlal-burst
 
 # Install gstlal-inspiral
-RUN . /opt/conda/etc/profile.d/conda.sh && \
-    conda activate base && \
-    export PREFIX="/opt/conda" && \
+RUN . $CONDA_PREFIX/etc/profile.d/conda.sh && \
+    conda activate build-env && \
+    export PREFIX="$CONDA_PREFIX" && \
     export CONDA_BUILD="1" && \
-    conda activate base && \
+    conda activate build-env && \
     cd /gstlal-inspiral && \
     ./00init.sh && \
-    ./configure --prefix=/opt/conda --without-doxygen --disable-massmodel && \
+    ./configure --prefix=$CONDA_PREFIX --without-doxygen --disable-massmodel && \
     make -j$NUM_CORES && \
     make install -j$NUM_CORES
 RUN rm -rf gstlal-inspiral
@@ -80,11 +80,11 @@ ARG CI_COMMIT_REF_NAME
 FROM $CI_REGISTRY_IMAGE/dependencies/conda:$CI_COMMIT_REF_NAME AS run
 
 # Copy build artifacts
-COPY --from=build /opt/conda /opt/conda
+COPY --from=build $CONDA_PREFIX $CONDA_PREFIX
 
 # Export environment variables: 
-ENV PKG_CONFIG_PATH /opt/conda/lib/pkgconfig
-ENV GST_PLUGIN_PATH /opt/conda/lib/gstreamer-1.0
+ENV PKG_CONFIG_PATH $CONDA_PREFIX/lib/pkgconfig
+ENV GST_PLUGIN_PATH $CONDA_PREFIX/lib/gstreamer-1.0
 ENV GSTLAL_FIR_WHITEN 0
 ENV TMPDIR /tmp
 
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 82f127360cd2729a2a666607b552bec388d2b17b..4066883222325512e8bdd718acafd4b4eb04eb39 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -60,18 +60,17 @@ stages:
     - |
       cat <<EOF > Dockerfile
       FROM igwn/base:conda
-      COPY gstlal-inspiral/share/conda/dev-environment.yml .
+      COPY gstlal/share/conda/envs/qualified-linux-64.lock .
+      SHELL ["/bin/bash", "-c"]
       RUN conda config --set always_yes yes
       RUN conda config --add channels conda-forge
       RUN conda update -n base conda && \
           conda clean -af
-      RUN conda env update -n base -f dev-environment.yml && \
+      RUN conda create -n build-env --file qualified-linux-64.lock --force && \
           conda clean -af
-      RUN conda install vim wget curl && \
-          conda clean -af
-      RUN rm -f dev-environment.yml
-      ENV PKG_CONFIG_PATH /opt/conda/lib/pkgconfig
-      ENV GST_PLUGIN_PATH /opt/conda/lib/gstreamer-1.0
+      RUN rm -f qualified-linux-64.lock
+      ENV PKG_CONFIG_PATH $CONDA_PREFIX/lib/pkgconfig
+      ENV GST_PLUGIN_PATH $CONDA_PREFIX/lib/gstreamer-1.0
       ENTRYPOINT bash
       EOF
     - docker build -t $IMAGE_TAG .