diff --git a/qa/rpc-tests/shorter_block_times.py b/qa/rpc-tests/shorter_block_times.py
index c74dae672..cfaa9c335 100755
--- a/qa/rpc-tests/shorter_block_times.py
+++ b/qa/rpc-tests/shorter_block_times.py
@@ -1,10 +1,8 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019 The Zcash developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://www.opensource.org/licenses/mit-license.php .
 
-import sys; assert sys.version_info < (3,), ur"This script does not run under Python 3. Please use Python 2.7.x."
-
 from decimal import Decimal
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
@@ -27,7 +25,7 @@ class ShorterBlockTimes(BitcoinTestFramework):
         initialize_chain_clean(self.options.tmpdir, 4)
 
     def run_test(self):
-        print "Mining blocks..."
+        print("Mining blocks...")
         self.nodes[0].generate(101)
         self.sync_all()
 
@@ -36,8 +34,8 @@ class ShorterBlockTimes(BitcoinTestFramework):
 
         node0_taddr = get_coinbase_address(self.nodes[0])
         node0_zaddr = self.nodes[0].z_getnewaddress('sapling')
-        recipients = [{'address': node0_zaddr, 'amount': Decimal('10')}]
-        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal('0'))
+        recipients = [{'address': node0_zaddr, 'amount': Decimal("10.0")}]
+        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal("0.0"))
         txid = wait_and_assert_operationid_status(self.nodes[0], myopid)
         assert_equal(105, self.nodes[0].getrawtransaction(txid, 1)['expiryheight'])  # Blossom activation - 1
         self.sync_all()
@@ -47,7 +45,7 @@ class ShorterBlockTimes(BitcoinTestFramework):
 
         self.nodes[0].generate(2)
         self.sync_all()
-        print "Mining last pre-Blossom blocks"
+        print("Mining last pre-Blossom blocks")
         # Activate blossom
         self.nodes[1].generate(1)
         self.sync_all()
@@ -55,14 +53,14 @@ class ShorterBlockTimes(BitcoinTestFramework):
         assert_equal(10, Decimal(self.nodes[1].getwalletinfo()['immature_balance']))
 
         # After blossom activation the block reward will be halved
-        print "Mining first Blossom block"
+        print("Mining first Blossom block")
         self.nodes[1].generate(1)
         self.sync_all()
         # Check that we received an additional Blossom mining reward
         assert_equal(15, self.nodes[1].getwalletinfo()['immature_balance'])
 
         # Send and mine a transaction after activation
-        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal('0'))
+        myopid = self.nodes[0].z_sendmany(node0_taddr, recipients, 1, Decimal('0.0'))
         txid = wait_and_assert_operationid_status(self.nodes[0], myopid)
         assert_equal(147, self.nodes[0].getrawtransaction(txid, 1)['expiryheight'])  # height + 1 + 40
         self.nodes[1].generate(1)