diff --git a/Dockerfile b/Dockerfile
index 5ac5b134af926795fca033d0d56507e95a0ff478..aa3d38f46c88d25f138218dac39f21b308932fad 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -24,7 +24,7 @@ RUN if $GUI; then \
 ### Python3 links and pip packages
 RUN ln -s /usr/bin/python3 /usr/local/bin/python && ln -s /usr/bin/pip3 /usr/local/bin/pip
 # NumPy version is conflicting with system's gdal dep and may require venv
-ARG NUMPY_SPEC="~=1.19"
+ARG NUMPY_SPEC="==1.19.*"
 RUN pip install --no-cache-dir -U pip wheel mock six future deprecated "numpy$NUMPY_SPEC" \
  && pip install --no-cache-dir --no-deps keras_applications keras_preprocessing