diff --git a/c_src/build_deps.sh b/c_src/build_deps.sh
index 07b43a8..38ae54e 100755
--- a/c_src/build_deps.sh
+++ b/c_src/build_deps.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-WT_VSN=1.2.0
+WT_VSN=1.2.1
 
 [ `basename $PWD` != "c_src" ] && cd c_src
 
diff --git a/c_src/wiredtiger-1.1.5.tar.bz2 b/c_src/wiredtiger-1.1.5.tar.bz2
deleted file mode 100644
index a22efc3..0000000
Binary files a/c_src/wiredtiger-1.1.5.tar.bz2 and /dev/null differ
diff --git a/c_src/wiredtiger-1.2.0.tar.bz2 b/c_src/wiredtiger-1.2.0.tar.bz2
deleted file mode 100644
index b775843..0000000
Binary files a/c_src/wiredtiger-1.2.0.tar.bz2 and /dev/null differ
diff --git a/c_src/wiredtiger-1.2.1.tar.bz2 b/c_src/wiredtiger-1.2.1.tar.bz2
new file mode 100644
index 0000000..d19deb9
Binary files /dev/null and b/c_src/wiredtiger-1.2.1.tar.bz2 differ