diff --git a/c_src/build_deps.sh b/c_src/build_deps.sh
index 2c7c774..0114e75 100755
--- a/c_src/build_deps.sh
+++ b/c_src/build_deps.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-WT_VSN=1.3.8
+WT_VSN=1.4.0
 
 [ `basename $PWD` != "c_src" ] && cd c_src
 
diff --git a/c_src/wiredtiger-1.3.8.tar.bz2 b/c_src/wiredtiger-1.3.8.tar.bz2
deleted file mode 100644
index 4d00cdf..0000000
Binary files a/c_src/wiredtiger-1.3.8.tar.bz2 and /dev/null differ
diff --git a/c_src/wiredtiger-1.4.0.tar.bz2 b/c_src/wiredtiger-1.4.0.tar.bz2
new file mode 100644
index 0000000..cff4c50
Binary files /dev/null and b/c_src/wiredtiger-1.4.0.tar.bz2 differ