diff --git a/.travis.yml b/.travis.yml
index aaae7b2a3..9a672d88c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,13 +27,13 @@ install:
 # For Python 3.5, also install optional dependencies that were not specified in Pipfile
 # For other Python versions we will only run the tests that depend on pure Python modules
 # - fastText dependencies
-- if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install fasttextmirror; fi
+- if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install fasttextmirror==0.8.22; fi
 # - voikko dependencies
 - if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install voikko; fi
 # - vw dependencies
 - if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then sudo ln -sf /usr/lib/x86_64-linux-gnu/libboost_python-py35.a /usr/lib/x86_64-linux-gnu/libboost_python3.a; fi
 - if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then sudo ln -sf /usr/lib/x86_64-linux-gnu/libboost_python-py35.so /usr/lib/x86_64-linux-gnu/libboost_python3.so; fi
-- if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install vowpalwabbit; fi
+- if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install vowpalwabbit==8.7.*; fi
 script:
 - pytest --cov=./
 after_success:
diff --git a/Dockerfile b/Dockerfile
index aa0a282de..d0856fc97 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ RUN apt-get update \
 		build-essential \
 	&& pip install --no-cache-dir \
 		cython \
-		fasttextmirror \
+		fasttextmirror==0.8.22 \
 	## Vowpal Wabbit
 	&& apt-get install -y --no-install-recommends \
 		libboost-program-options-dev \
@@ -52,7 +52,7 @@ RUN apt-get update \
 		libboost-python1.67.0 \
 		libboost-system1.67.0 \
 	&& pip install --no-cache-dir \
-		vowpalwabbit \
+		vowpalwabbit==8.7.* \
 	## Clean up:
 	&& rm -rf /var/lib/apt/lists/* /usr/include/* \
 	&& rm -rf /root/.cache/pip*/*
diff --git a/Pipfile b/Pipfile
index 4c9dbca20..4ae6128d5 100644
--- a/Pipfile
+++ b/Pipfile
@@ -20,10 +20,10 @@ connexion = {extras = ["swagger-ui"]}
 swagger-ui-bundle = "*"
 flask-cors = "*"
 click-log = "*"
-joblib = "*"
+joblib = "==0.13.*"
 nltk = "*"
-gensim = "*"
-sklearn = "*"
+gensim = "==3.8.*"
+scikit-learn = "==0.21.*"
 rdflib = "*"
 gunicorn = "*"
 sphinxcontrib-apidoc = "*"
diff --git a/setup.py b/setup.py
index 76c7e0720..fd6c9718e 100644
--- a/setup.py
+++ b/setup.py
@@ -25,16 +25,16 @@ def read(fname):
         'flask-cors',
         'click',
         'click-log',
-        'joblib',
+        'joblib==0.13.*',
         'nltk',
-        'gensim',
-        'sklearn',
+        'gensim==3.8.*',
+        'scikit-learn==0.21.*',
         'rdflib'],
     tests_require=['py', 'pytest', 'requests'],
     extras_require={
-        'fasttext': ['fasttext', 'fasttextmirror'],
+        'fasttext': ['fasttext', 'fasttextmirror==0.8.22'],
         'voikko': ['voikko'],
-        'vw': ['vowpalwabbit', 'numpy'],
+        'vw': ['vowpalwabbit==8.7.*', 'numpy'],
     },
     entry_points={
         'console_scripts': ['annif=annif.cli:cli']},