diff --git a/doc/release-notes-6187.md b/doc/release-notes-6187.md
new file mode 100644
index 0000000000..848bfb6b20
--- /dev/null
+++ b/doc/release-notes-6187.md
@@ -0,0 +1,3 @@
+## Devnet Breaking Changes
+
+`BRR` (`realloc`), `DIP0020`, `DIP0024`, `V19`, `V20` and `MN_R` hardforks are activated at block 2 instead of block 300 on devnets now. Please note that this is a breaking change so you will no longer be able to sync on devnets created with earlier Dash Core versions and vice versa.
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 701f8e225b..e041149cd1 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -524,24 +524,24 @@ public:
         consensus.nGovernanceMinQuorum = 1;
         consensus.nGovernanceFilterElements = 500;
         consensus.nMasternodeMinimumConfirmations = 1;
-        consensus.BIP34Height = 1; // BIP34 activated immediately on devnet
-        consensus.BIP65Height = 1; // BIP65 activated immediately on devnet
-        consensus.BIP66Height = 1; // BIP66 activated immediately on devnet
-        consensus.BIP147Height = 1; // BIP147 activated immediately on devnet
-        consensus.CSVHeight = 1; // BIP68 activated immediately on devnet
+        consensus.BIP34Height = 1;   // BIP34 activated immediately on devnet
+        consensus.BIP65Height = 1;   // BIP65 activated immediately on devnet
+        consensus.BIP66Height = 1;   // BIP66 activated immediately on devnet
+        consensus.BIP147Height = 1;  // BIP147 activated immediately on devnet
+        consensus.CSVHeight = 1;     // BIP68 activated immediately on devnet
         consensus.DIP0001Height = 2; // DIP0001 activated immediately on devnet
         consensus.DIP0003Height = 2; // DIP0003 activated immediately on devnet
         consensus.DIP0003EnforcementHeight = 2; // DIP0003 activated immediately on devnet
         consensus.DIP0003EnforcementHash = uint256();
         consensus.DIP0008Height = 2; // DIP0008 activated immediately on devnet
-        consensus.BRRHeight = 300;
-        consensus.DIP0020Height = 300;
-        consensus.DIP0024Height = 300;
-        consensus.DIP0024QuorumsHeight = 300;
-        consensus.V19Height = 300;
-        consensus.V20Height = 300;
-        consensus.MN_RRHeight = 300;
-        consensus.MinBIP9WarningHeight = 300 + 2016; // mn_rr activation height + miner confirmation window
+        consensus.BRRHeight = 2;     // BRR (realloc) activated immediately on devnet
+        consensus.DIP0020Height = 2; // DIP0020 activated immediately on devnet
+        consensus.DIP0024Height = 2; // DIP0024 activated immediately on devnet
+        consensus.DIP0024QuorumsHeight = 2; // DIP0024 activated immediately on devnet
+        consensus.V19Height = 2;     // V19 activated immediately on devnet
+        consensus.V20Height = 2;     // V20 activated immediately on devnet
+        consensus.MN_RRHeight = 2;   // MN_RR activated immediately on devnet
+        consensus.MinBIP9WarningHeight = 2 + 2016; // v19 activation height + miner confirmation window
         consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"); // ~uint256(0) >> 1
         consensus.nPowTargetTimespan = 24 * 60 * 60; // Dash: 1 day
         consensus.nPowTargetSpacing = 2.5 * 60; // Dash: 2.5 minutes