1 files changed, 6 insertions, 6 deletions

diff --git a/dev-requirements.txt b/dev-requirements.txt
index feae948a..0c1fc020 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,11 +1,11 @@
 # Older junk
 tox>=1.4,<1.5
 # For newer tasks like building Sphinx docs.
-invoke>=0.11.1
-invocations>=0.11.0
-sphinx>=1.1.3
-alabaster>=0.7.5
-releases>=1.1.0
-semantic_version<3
+invoke>=0.11.1,<2.0
+invocations>=0.11.0,<2.0
+sphinx>=1.1.3,<2.0
+alabaster>=0.7.5,<2.0
+releases>=1.1.0,<2.0
+semantic_version<3.0
 wheel==0.24
 twine==1.5