diff --git a/Dockerfile b/Dockerfile
index 8b30519..88b4728 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,8 +9,8 @@ RUN apk update && \
 COPY environment.yml /environment.yml
 # Python 3.8.5 already installed along with recent version of pip
 # so remove Python and pip deps from environment.yml before installation
-RUN sed -i "$(grep -n python>=3.7 /environment.yml | cut -f1 -d:)d" /environment.yml && \
-    sed -i "$(grep -n pip= /environment.yml | cut -f1 -d:)d" /environment.yml
+RUN sed -i "$(grep -n 'python>=3.7' /environment.yml | cut -f1 -d:)d" /environment.yml && \
+    sed -i "$(grep -n 'pip=' /environment.yml | cut -f1 -d:)d" /environment.yml
 # Install the conda environment
 RUN conda env create --quiet -f /environment.yml && conda clean -a
 # Add conda installation dir to PATH (instead of doing 'conda activate')