diff --git a/.travis.yml b/.travis.yml
index d45da7f8f7b0a99c0b8d04fe70119234549d4103..58d25b7774e659133c7b195ce1281fdd942fc5ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
language: nix
+nix: 2.3
sudo: false
application/octet-stream
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