diff --git a/requirements_dev.txt b/requirements_dev.txt
index 560a391..9379956 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,10 +7,10 @@ coverage>=4.0
 Sphinx>=1.3.1
 PyYAML>=3.11
 
-attrs
-codecov
-requests
-requests-staticmock
-pytest
-pytest-runner
-pytest-cov
+attrs==17.3.0
+codecov==2.0.10
+requests==2.18.4
+requests-staticmock==1.4.0
+pytest==3.3.1
+pytest-runner==3.0
+pytest-cov==2.5.1