diff --git a/exchange/docker/linter/Dockerfile b/exchange/docker/linter/Dockerfile
index c8d20cb9..2e8d736d 100644
--- a/exchange/docker/linter/Dockerfile
+++ b/exchange/docker/linter/Dockerfile
@@ -33,4 +33,7 @@ ENV NUTC_CPP_TEMPLATE_PATH="/app/template.cpp"
 
 EXPOSE 18081
 
+# Numpy
+ENV OPENBLAS_NUM_THREADS=1
+
 CMD /app/exchange/build/LINTER
diff --git a/exchange/docker/sandbox/Dockerfile b/exchange/docker/sandbox/Dockerfile
index 21566384..ede983af 100644
--- a/exchange/docker/sandbox/Dockerfile
+++ b/exchange/docker/sandbox/Dockerfile
@@ -33,6 +33,9 @@ ENV NUTC_WRAPPER_BINARY_PATH="/app/exchange/build/WRAPPER"
 ENV NUTC_CONFIG_FILE="/app/exchange/config.yml"
 ENV NUTC_CPP_TEMPLATE_PATH="/app/template.cpp"
 
+# Numpy
+ENV OPENBLAS_NUM_THREADS=1
+
 EXPOSE 4152 18080
 
 ENTRYPOINT ["/app/exchange/build/NUTC"]