diff --git a/contrib/assets_tutorial/assets_tutorial.py b/contrib/assets_tutorial/assets_tutorial.py
index 8e0919768a..3b933a17a0 100755
--- a/contrib/assets_tutorial/assets_tutorial.py
+++ b/contrib/assets_tutorial/assets_tutorial.py
@@ -482,7 +482,7 @@ extra_args = [
     "-con_max_block_sig_size=150",
     # We also disable dynamic federations, since we are not going to do any
     # dynafed transitions in this tutorial. FIXME we probably should.
-    "-con_dyna_deploy_start=0",
+    "-evbparams=dynafed:0:::",
 ]
 
 print ("6b. Restart both nodes")
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 1e1de1ced8..f0086a6864 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -839,7 +839,7 @@ class CCustomParams : public CRegTestParams {
         }
 
         consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].bit = 25;
-        consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nStartTime = args.GetArg("-con_dyna_deploy_start", Consensus::BIP9Deployment::ALWAYS_ACTIVE);
+        consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
         consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
 
         UpdateElementsActivationParametersFromArgs(consensus, args);
@@ -1361,11 +1361,9 @@ public:
             consensus.subsidy_asset = CAsset(uint256S(args.GetArg("-subsidyasset", "")));
         }
 
-        if (args.IsArgSet("-con_dyna_deploy_start")) {
-            consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].bit = 25;
-            consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nStartTime = args.GetArg("-con_dyna_deploy_start", Consensus::BIP9Deployment::ALWAYS_ACTIVE);
-            consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
-        }
+        consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].bit = 25;
+        consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
+        consensus.vDeployments[Consensus::DEPLOYMENT_DYNA_FED].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
 
         UpdateElementsActivationParametersFromArgs(consensus, args);
 
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index c87dd674e6..7173ccf69b 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -56,7 +56,6 @@ void SetupChainParamsBaseOptions(ArgsManager& argsman)
     argsman.AddArg("-pak", "Sets the 'first extension space' field to the pak entries ala pre-dynamic federations. Only used for testing in custom chains.", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
     argsman.AddArg("-multi_data_permitted", "Allow relay of multiple OP_RETURN outputs. (default: -enforce_pak)", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
     argsman.AddArg("-con_csv_deploy_start", "Starting height for CSV deployment. (default: -1, which means ACTIVE from genesis)", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
-    argsman.AddArg("-con_dyna_deploy_start", "Starting height for Dynamic Federations deployment. Once active, signblockscript becomes a BIP141 WSH scriptPubKey of the original signblockscript. All other dynamic parameters stay constant.(default: -1, which means ACTIVE from genesis)", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
     argsman.AddArg("-con_dyna_deploy_signal", "Whether to signal for the Dynamic Federations deployment (default: true).", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
     argsman.AddArg("-dynamic_epoch_length", "Per-chain parameter that sets how many blocks dynamic federation voting and enforcement are in effect for.", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
     argsman.AddArg("-total_valid_epochs", "Per-chain parameter that sets how long a particular fedpegscript is in effect for.", ArgsManager::ALLOW_ANY, OptionsCategory::ELEMENTS);
diff --git a/test/bitcoin_functional/functional/test_framework/util.py b/test/bitcoin_functional/functional/test_framework/util.py
index 303f501488..cb83ec20de 100644
--- a/test/bitcoin_functional/functional/test_framework/util.py
+++ b/test/bitcoin_functional/functional/test_framework/util.py
@@ -322,7 +322,7 @@ def initialize_datadir(dirname, n):
         f.write("pubkeyprefix=111\n")
         f.write("scriptprefix=196\n")
         f.write("bech32_hrp=bcrt\n")
-        f.write("con_dyna_deploy_start="+str(2**31)+"\n") # Never starts
+        f.write("evbparams=dynafed:"+str(2**31)+":::\n") # Never starts
         f.write("minrelaytxfee=0.00001\n")
         os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
         os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
diff --git a/test/functional/feature_blocksign.py b/test/functional/feature_blocksign.py
index 363664afe2..b8c55af5b6 100755
--- a/test/functional/feature_blocksign.py
+++ b/test/functional/feature_blocksign.py
@@ -82,7 +82,7 @@ class BlockSignTest(BitcoinTestFramework):
             "-signblockscript={}".format(signblockscript),
             "-con_max_block_sig_size={}".format(self.required_signers*74+self.num_nodes*33),
             "-anyonecanspendaremine=1",
-            "-con_dyna_deploy_start=0",
+            "-evbparams=dynafed:0:::",
             "-con_dyna_deploy_signal=1",
         ]] * self.num_nodes
 
diff --git a/test/functional/feature_dynafed.py b/test/functional/feature_dynafed.py
index 1e219fc521..32322602ad 100755
--- a/test/functional/feature_dynafed.py
+++ b/test/functional/feature_dynafed.py
@@ -67,7 +67,7 @@ class DynaFedTest(BitcoinTestFramework):
         self.num_nodes = 2
         # We want to test activation of dynafed
         self.extra_args = [[
-            "-con_dyna_deploy_start=1000",
+            "-evbparams=dynafed:1000:::",
             "-enforce_pak=1",
             "-con_parent_chain_signblockscript=51",
             "-peginconfirmationdepth=1",
@@ -78,7 +78,7 @@ class DynaFedTest(BitcoinTestFramework):
         # second node will not mine transactions
         self.extra_args[1].append("-blocksonly=1")
         # Make sure nothing breaks if peers have a different activation.
-        self.extra_args[1][0] = "-con_dyna_deploy_start=937"
+        self.extra_args[1][0] = "-evbparams=dynafed:937:::"
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
diff --git a/test/functional/feature_fedpeg.py b/test/functional/feature_fedpeg.py
index b727708b9c..7ad5e137df 100755
--- a/test/functional/feature_fedpeg.py
+++ b/test/functional/feature_fedpeg.py
@@ -140,7 +140,7 @@ class FedPegTest(BitcoinTestFramework):
 
             # Immediate activation of dynafed when requested versus "never" from conf
             if self.options.pre_transition or self.options.post_transition:
-                extra_args.extend(["-con_dyna_deploy_start=-1"])
+                extra_args.extend(["-evbparams=dynafed:-1:::"])
 
             # Use rpcuser auth only for first parent.
             if n==0:
diff --git a/test/functional/feature_pak.py b/test/functional/feature_pak.py
index 7fd8479f67..5eb3598bb5 100755
--- a/test/functional/feature_pak.py
+++ b/test/functional/feature_pak.py
@@ -18,7 +18,7 @@ class PAKTest (BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 3
         self.setup_clean_chain = True
-        self.extra_args = [["-enforce_pak=1", "-con_dyna_deploy_start=-1", "-initialfreecoins=210000000000000", "-anyonecanspendaremine=1", "-parent_bech32_hrp=lol", "-pubkeyprefix=112", "-scriptprefix=197", "-con_connect_genesis_outputs=1"] for i in range(self.num_nodes)]
+        self.extra_args = [["-enforce_pak=1", "-evbparams=dynafed:-1:::", "-initialfreecoins=210000000000000", "-anyonecanspendaremine=1", "-parent_bech32_hrp=lol", "-pubkeyprefix=112", "-scriptprefix=197", "-con_connect_genesis_outputs=1"] for i in range(self.num_nodes)]
         # First node doesn't enforce PAK, a "HF" of the other two nodes
         self.extra_args[0] = ["-acceptnonstdtxn=1"] + self.extra_args[0][1:]   ## FIXME -acceptnonstdtxn=1 should not be needed
 
diff --git a/test/functional/feature_sighash_rangeproof.py b/test/functional/feature_sighash_rangeproof.py
index 4ffdcf9ffc..0fb4dd7836 100755
--- a/test/functional/feature_sighash_rangeproof.py
+++ b/test/functional/feature_sighash_rangeproof.py
@@ -51,7 +51,7 @@ class SighashRangeproofTest(BitcoinTestFramework):
         self.num_nodes = 3
         # We want to test activation of dynafed
         self.extra_args = [[
-            "-con_dyna_deploy_start=1000",
+            "-evbparams=dynafed:1000:::",
             "-con_dyna_deploy_signal=1",
             "-blindedaddresses=1",
             "-initialfreecoins=2100000000000000",
diff --git a/test/functional/rpc_tweakfedpeg.py b/test/functional/rpc_tweakfedpeg.py
index 5f67b625ab..51685f27e2 100755
--- a/test/functional/rpc_tweakfedpeg.py
+++ b/test/functional/rpc_tweakfedpeg.py
@@ -26,7 +26,7 @@ class TweakFedpegTest(BitcoinTestFramework):
         [
             "-fedpegscript="+LIQUID_SCRIPT,
             "-con_dyna_deploy_signal=1",
-            "-con_dyna_deploy_start=0", # test dynafed derivation
+            "-evbparams=dynafed:0:::", # test dynafed derivation
         ]]
 
     def setup_network(self):
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 7abb757a6d..01a677cf34 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -381,7 +381,7 @@ def initialize_datadir(dirname, n, chain):
         f.write("con_bip65height=1351\n")
         f.write("con_bip66height=1251\n")
         f.write("blindedaddresses=0\n") # Set to minimize broken tests in favor of custom
-        f.write("con_dyna_deploy_start="+str(2**31)+"\n") # Never starts unless overridden
+        f.write("evbparams=dynafed:"+str(2**31)+":::\n") # Never starts unless overridden
         f.write("minrelaytxfee=0.00001\n")
         #f.write("pubkeyprefix=111\n")
         #f.write("scriptprefix=196\n")