diff --git a/requirements.txt b/requirements.txt
index da780d5..7ba44f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-requests
-pytz
\ No newline at end of file
+requests==2.18.1
+pytz==2017.2
\ No newline at end of file
diff --git a/requirements_test.txt b/requirements_test.txt
index 055e410..4c721d8 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,3 +1,3 @@
-pytest
-requests-mock
-pytest-cov
\ No newline at end of file
+pytest==3.1.2
+requests-mock==1.3.0
+pytest-cov==2.5.1
\ No newline at end of file