diff --git a/Dockerfile b/Dockerfile
index 78c6405..f1dd17d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,8 @@ COPY --chown=irisowner:irisowner . /home/irisowner/sqlalchemy-iris
 
 WORKDIR /home/irisowner/sqlalchemy-iris
 
+ENV PIP_TARGET=/usr/irissys/mgr/python
+
 RUN pip install -r requirements-dev.txt -r requirements-iris.txt && \
     pip install -e .
 
diff --git a/test-in-docker.sh b/test-in-docker.sh
index dcb49f1..4060e75 100755
--- a/test-in-docker.sh
+++ b/test-in-docker.sh
@@ -28,11 +28,11 @@ exit_on_error () {
 iris_start
 
 # Test in Network mode
-python3 -m pytest
+/usr/irissys/bin/irispython -m pytest
 exit_on_error
 
 # Test in Embedded mode
-python3 -m pytest --db irisemb
+/usr/irissys/bin/irispython -m pytest --db irisemb
 exit_on_error
 
 iris_stop