diff --git a/.travis.yml b/.travis.yml
index b57a905..055f16b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,7 +40,7 @@ addons:
             - cython3
             - ccache
 install:
-    - pip install pipenv pysdl2 python-bitcoinrpc protobuf poetry
+    - pip install pipenv pysdl2 python-bitcoinrpc protobuf poetry==0.12.12
     # From trezor-mcu to get the correct protobuf version
     - curl -LO "https://github.com/google/protobuf/releases/download/v3.4.0/protoc-3.4.0-linux-x86_64.zip"
     - unzip "protoc-3.4.0-linux-x86_64.zip" -d protoc
@@ -56,7 +56,7 @@ jobs:
         -   name: With command line interface
             script: cd test; poetry run ./run_tests.py --interface=cli
         -   name: With stdin interface
-            script: cd test; ./run_tests.py --interface=stdin
+            script: cd test; poetry run ./run_tests.py --interface=stdin
         -   name: With linux binary distribution command line interface
             services: docker
             before_script:
diff --git a/contrib/build_bin.sh b/contrib/build_bin.sh
index e7b550a..398ca57 100755
--- a/contrib/build_bin.sh
+++ b/contrib/build_bin.sh
@@ -4,7 +4,7 @@
 eval "$(pyenv init -)"
 eval "$(pyenv virtualenv-init -)"
 pip install -U pip
-pip install poetry
+pip install poetry==0.12.12
 
 # Setup poetry and install the dependencies
 poetry install
diff --git a/contrib/build_dist.sh b/contrib/build_dist.sh
index b6b7d6b..3c12c2e 100755
--- a/contrib/build_dist.sh
+++ b/contrib/build_dist.sh
@@ -4,7 +4,7 @@
 eval "$(pyenv init -)"
 eval "$(pyenv virtualenv-init -)"
 pip install -U pip
-pip install poetry
+pip install poetry==0.12.12
 
 # Setup poetry and install the dependencies
 poetry install
diff --git a/contrib/build_wine.sh b/contrib/build_wine.sh
index b7d6e4d..8d68215 100755
--- a/contrib/build_wine.sh
+++ b/contrib/build_wine.sh
@@ -53,7 +53,7 @@ popd
 $PYTHON -m pip install -U pip
 
 # Install Poetry and things needed for pyinstaller
-$PYTHON -m pip install poetry
+$PYTHON -m pip install poetry==0.12.12
 
 # We also need to change the timestamps of all of the base library files
 lib_dir=~/.wine/drive_c/python3/Lib