diff --git a/tools/ci/cibuild.sh b/tools/ci/cibuild.sh
index 19ca20de098..68001c65ba2 100755
--- a/tools/ci/cibuild.sh
+++ b/tools/ci/cibuild.sh
@@ -62,7 +62,12 @@ function python-tools {
   PYTHONUSERBASE=${prebuilt}/pylocal
   export PYTHONUSERBASE
   add_path "${PYTHONUSERBASE}"/bin
-  pip3 install pexpect
+  pip3 install pexpect==4.8.0
+  pip3 install pytest==6.2.5
+  pip3 install pytest-repeat==0.9.1
+  pip3 install pytest-json==0.4.0
+  pip3 install pytest-ordering==0.6
+  pip3 install pyserial==3.5
 
   # MCUboot's tool for image signing and key management
   if ! command -v imgtool &> /dev/null; then
diff --git a/tools/ci/docker/linux/Dockerfile b/tools/ci/docker/linux/Dockerfile
index 54c0fd7adff..66850cb4f4d 100644
--- a/tools/ci/docker/linux/Dockerfile
+++ b/tools/ci/docker/linux/Dockerfile
@@ -264,6 +264,13 @@ ENV PIP_NO_CACHE_DIR=0
 RUN pip3 install setuptools wheel
 # Install CodeChecker and use it to statically analyze the code.
 RUN pip3 install CodeChecker
+# Install pytest
+RUN pip3 install pexpect==4.8.0
+RUN pip3 install pytest==6.2.5
+RUN pip3 install pytest-repeat==0.9.1
+RUN pip3 install pytest-json==0.4.0
+RUN pip3 install pytest-ordering==0.6
+RUN pip3 install pyserial==3.5
 
 RUN mkdir /tools
 WORKDIR /tools