diff --git a/doc/release-process.md b/doc/release-process.md
index dd0efc66..f359bd4c 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -30,8 +30,14 @@ git shortlog helps a lot, for example:
 
     $ git shortlog --no-merges v${ZCASH_RELEASE_PREV}..HEAD \
         > ./doc/release-notes/release-notes-${ZCASH_RELEASE}.md
+
+### B3. change the network magics
+
+If this release breaks backwards compatibility, change the network magic
+numbers. Set the four `pchMessageStart` in `CTestNetParams` in `chainparams.cpp`
+to random values.
         
-### B3. merge the previous changes
+### B4. merge the previous changes
 
 Do the normal pull-request, review, testing process for this release PR.
 
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index f09f4cdb..a6885f45 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -157,10 +157,10 @@ public:
         consensus.nMajorityWindow = 400;
         consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.fPowAllowMinDifficultyBlocks = true;
-        pchMessageStart[0] = 0x6d;
-        pchMessageStart[1] = 0xf6;
-        pchMessageStart[2] = 0xe7;
-        pchMessageStart[3] = 0x55;
+        pchMessageStart[0] = 0xa9;
+        pchMessageStart[1] = 0xf0;
+        pchMessageStart[2] = 0x94;
+        pchMessageStart[3] = 0x11;
         vAlertPubKey = ParseHex("04302390343f91cc401d56d68b123028bf52e5fca1939df127f63c6467cdf9c8e2c14b61104cf817d0b780da337893ecc4aaff1309e536162dabbdb45200ca2b0a");
         nDefaultPort = 18233;
         nMinerThreads = 0;