diff --git a/buildscripts/evergreen_gen_multiversion_tests.py b/buildscripts/evergreen_gen_multiversion_tests.py
index 952488e158..4103f44e0f 100755
--- a/buildscripts/evergreen_gen_multiversion_tests.py
+++ b/buildscripts/evergreen_gen_multiversion_tests.py
@@ -91,8 +91,8 @@ def get_backports_required_last_stable_hash(task_path_suffix: str):
     shell_version = check_output([last_stable_shell_exec, "--version"]).decode('utf-8')
     last_stable_commit_hash = ""
     for line in shell_version.splitlines():
-        if "git version" in line:
-            last_stable_commit_hash = line.split(':')[1].strip()
+        if "gitVersion" in line:
+            last_stable_commit_hash = line.split(':')[1].strip('"')
             break
     if not last_stable_commit_hash:
         raise ValueError("Could not find a valid commit hash from the last-stable mongo binary.")
diff --git a/buildscripts/resmokeconfig/suites/replica_sets_multiversion.yml b/buildscripts/resmokeconfig/suites/replica_sets_multiversion.yml
index 1cc4e29411..d1858e975f 100644
--- a/buildscripts/resmokeconfig/suites/replica_sets_multiversion.yml
+++ b/buildscripts/resmokeconfig/suites/replica_sets_multiversion.yml
@@ -6,10 +6,6 @@ selector:
   exclude_with_any_tags:
   - multiversion_incompatible
   - requires_fcv_44
-  exclude_files:
-  - jstests/replsets/*.js
-  # Enable when 4.4 becomes last stable
-  - jstests/replsets/no_disconnect_on_stepdown.js
 executor:
   config:
     shell_options:
diff --git a/buildscripts/resmokelib/testing/fixtures/replicaset.py b/buildscripts/resmokelib/testing/fixtures/replicaset.py
index 9679c27766..119c0b6822 100644
--- a/buildscripts/resmokelib/testing/fixtures/replicaset.py
+++ b/buildscripts/resmokelib/testing/fixtures/replicaset.py
@@ -117,7 +117,8 @@ class ReplicaSetFixture(interface.ReplFixture):  # pylint: disable=too-many-inst
 
         for i in range(self.num_nodes):
             steady_state_constraint_param = "oplogApplicationEnforcesSteadyStateConstraints"
-            if steady_state_constraint_param not in self.nodes[i].mongod_options["set_parameters"]:
+            if (steady_state_constraint_param not in self.nodes[i].mongod_options["set_parameters"]
+                and self.mixed_bin_versions is not None and self.mixed_bin_versions[i] == "new"):
                 self.nodes[i].mongod_options["set_parameters"][steady_state_constraint_param] = True
             if self.linear_chain and i > 0:
                 self.nodes[i].mongod_options["set_parameters"][
diff --git a/etc/evergreen.yml b/etc/evergreen.yml
index 1322416dd7..078ea2bc24 100644
--- a/etc/evergreen.yml
+++ b/etc/evergreen.yml
@@ -8907,10 +8907,10 @@ buildvariants:
   - name: .jstestfuzz_multiversion_gen
   - name: libunwind_tests
   - name: .logical_session_cache .one_sec
-# - name: .multiversion_fuzzer
-# - name: .multiversion_passthrough
+  - name: .multiversion_fuzzer
+  - name: .multiversion_passthrough
   - name: .ocsp
-# - name: .random_multiversion_replica_sets
+  - name: .random_multiversion_replica_sets
   - name: replica_sets_auth_gen
   - name: replica_sets_jscore_passthrough
   - name: sasl
@@ -10028,7 +10028,7 @@ buildvariants:
   - name: lint_yaml
   - name: lint_errorcodes
   - name: burn_in_tests_gen
-# - name: burn_in_tests_multiversion_gen
+  - name: burn_in_tests_multiversion_gen
   - name: .aggfuzzer
   - name: .aggregation
   - name: audit
@@ -10058,13 +10058,13 @@ buildvariants:
   - name: jsonSchema
   - name: .jstestfuzz !.flow_control  # Flow control jstestfuzz take longer.
   - name: libunwind_tests
-# - name: multiversion_sanity_check_gen
+  - name: multiversion_sanity_check_gen
   - name: mqlrun
   - name: .multi_shard
   - name: multi_stmt_txn_jscore_passthrough_with_migration_gen
   - name: multiversion_gen
   - name: .query_fuzzer
-# - name: .random_multiversion_replica_sets
+  - name: .random_multiversion_replica_sets
   - name: .read_write_concern .large
     distros:
     - rhel62-large
@@ -10264,7 +10264,7 @@ buildvariants:
   - name: .jstestfuzz !.flow_control
   - name: .logical_session_cache .repl
   - name: multiversion_gen
-# - name: .random_multiversion_replica_sets
+  - name: .random_multiversion_replica_sets
   - name: .read_write_concern .large
     distros:
     - rhel62-large
@@ -10317,9 +10317,9 @@ buildvariants:
   - name: compile_all_run_unittests_TG
     distros:
     - rhel62-large
-# - name: .multiversion_fuzzer
-# - name: .multiversion_passthrough
-# - name: .random_multiversion_replica_sets
+  - name: .multiversion_fuzzer
+  - name: .multiversion_passthrough
+  - name: .random_multiversion_replica_sets
 
 - name: enterprise-rhel-62-64-bit-flow-control-off
   display_name: "Enterprise RHEL 6.2 (flow control off)"
@@ -10477,10 +10477,10 @@ buildvariants:
     - name: .logical_session_cache .one_sec
     - name: .multi_shard .common
     - name: multiversion_gen
-#   - name: .multiversion_fuzzer
-#   - name: .multiversion_passthrough
+    - name: .multiversion_fuzzer
+    - name: .multiversion_passthrough
     - name: .query_fuzzer
-#   - name: .random_multiversion_replica_sets
+    - name: .random_multiversion_replica_sets
     - name: .read_write_concern
     - name: .replica_sets
     - name: .read_only
@@ -12144,10 +12144,10 @@ buildvariants:
   - name: .logical_session_cache
   - name: .multi_shard .common
   - name: multiversion_gen
-# - name: .multiversion_fuzzer
-# - name: .multiversion_passthrough
+  - name: .multiversion_fuzzer
+  - name: .multiversion_passthrough
   - name: .query_fuzzer
-# - name: .random_multiversion_replica_sets
+  - name: .random_multiversion_replica_sets
   - name: .read_write_concern
   - name: replica_sets_large_txns_format_gen
   - name: replica_sets_large_txns_format_jscore_passthrough
@@ -12234,9 +12234,9 @@ buildvariants:
   - name: .logical_session_cache .one_sec
   - name: .multi_shard .common
   - name: multiversion_gen
-# - name: .multiversion_fuzzer
-# - name: .multiversion_passthrough
-# - name: .random_multiversion_replica_sets
+  - name: .multiversion_fuzzer
+  - name: .multiversion_passthrough
+  - name: .random_multiversion_replica_sets
   - name: .read_write_concern
   - name: replica_sets_large_txns_format_gen
   - name: replica_sets_large_txns_format_jscore_passthrough