diff --git a/CHANGES.md b/CHANGES.md
index 5a16d56..36cdc8d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,10 @@ Change history for MOST
 since 1.2
 ---------
 
+#### 4/4/24
+  - Tweak tests to avoid warnings and presolve bug with new HiGHS-based
+    `linprog` and `intlinprog` in Optimization Toolbox R2024a.
+
 #### 3/21/24
   - Add Sphinx-based Reference documentation.
 
diff --git a/lib/mostver.m b/lib/mostver.m
index 57f7bf6..225c70a 100644
--- a/lib/mostver.m
+++ b/lib/mostver.m
@@ -26,7 +26,7 @@
 v = struct( 'Name',     'MOST', ...
             'Version',  '1.2+', ...
             'Release',  '', ...
-            'Date',     '15-Mar-2024' );
+            'Date',     '04-Apr-2024' );
 if nargout > 0
     if nargin > 0
         rv = v;
diff --git a/lib/mpoption_info_most.m b/lib/mpoption_info_most.m
index 528cddf..858eeaf 100644
--- a/lib/mpoption_info_most.m
+++ b/lib/mpoption_info_most.m
@@ -1,5 +1,5 @@
 function opt = mpoption_info_most(selector)
-% mpoption_info_most - Returns MATPOWER option info for MOST.
+% mpoption_info_most - Returns |MATPOWER| option info for MOST.
 % ::
 %
 %   DEFAULT_OPTS = MPOPTION_INFO_MOST('D')
diff --git a/lib/t/t_most_spuc.m b/lib/t/t_most_spuc.m
index 33af613..7f7c026 100644
--- a/lib/t/t_most_spuc.m
+++ b/lib/t/t_most_spuc.m
@@ -96,7 +96,7 @@ function t_most_spuc(quiet, create_plots, create_pdfs, savedir)
     mpopt = mpoption(mpopt, 'mosek.opts.MSK_DPAR_MIO_TOL_REL_GAP', 0);
     mpopt = mpoption(mpopt, 'mosek.opts.MSK_DPAR_MIO_TOL_ABS_GAP', 0);
 end
-if have_feature('intlinprog')
+if have_feature('intlinprog') && have_feature('intlinprog', 'vnum') < 24
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'interior-point');
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'active-set');
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'simplex');
diff --git a/lib/t/t_most_suc.m b/lib/t/t_most_suc.m
index 41994b6..82fb610 100644
--- a/lib/t/t_most_suc.m
+++ b/lib/t/t_most_suc.m
@@ -117,7 +117,7 @@ function t_most_suc(quiet, create_plots, create_pdfs, savedir)
     mpopt = mpoption(mpopt, 'mosek.opts.MSK_DPAR_MIO_TOL_REL_GAP', 0);
     mpopt = mpoption(mpopt, 'mosek.opts.MSK_DPAR_MIO_TOL_ABS_GAP', 0);
 end
-if have_feature('intlinprog')
+if have_feature('intlinprog') && have_feature('intlinprog', 'vnum') < 24
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'interior-point');
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'active-set');
     %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'simplex');
diff --git a/lib/t/t_most_uc.m b/lib/t/t_most_uc.m
index 0a3778d..7b62ec2 100644
--- a/lib/t/t_most_uc.m
+++ b/lib/t/t_most_uc.m
@@ -119,21 +119,26 @@ function t_most_uc(quiet, create_plots, create_pdfs, savedir)
     mpopt = mpoption(mpopt, 'mosek.opts.MSK_DPAR_MIO_TOL_ABS_GAP', 0);
 end
 if have_feature('intlinprog')
-    %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'interior-point');
-    %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'active-set');
-    %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'simplex');
-    mpopt = mpoption(mpopt, 'linprog.Algorithm', 'dual-simplex');
-    %mpopt = mpoption(mpopt, 'intlinprog.RootLPAlgorithm', 'primal-simplex');
-    mpopt = mpoption(mpopt, 'intlinprog.RootLPAlgorithm', 'dual-simplex');
     mpopt = mpoption(mpopt, 'intlinprog.TolCon', 1e-9);
     mpopt = mpoption(mpopt, 'intlinprog.TolGapAbs', 0);
     mpopt = mpoption(mpopt, 'intlinprog.TolGapRel', 0);
-    mpopt = mpoption(mpopt, 'intlinprog.TolInteger', 1e-6);
-    %% next line is to work around a bug in intlinprog
-    % (Technical Support Case #01841662)
-    % (except actually in this case it triggers it rather than working
-    %  around it, so we comment it out)
-    %mpopt = mpoption(mpopt, 'intlinprog.LPPreprocess', 'none');
+    if have_feature('intlinprog', 'vnum') < 24
+        %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'interior-point');
+        %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'active-set');
+        %mpopt = mpoption(mpopt, 'linprog.Algorithm', 'simplex');
+        mpopt = mpoption(mpopt, 'linprog.Algorithm', 'dual-simplex');
+        %mpopt = mpoption(mpopt, 'intlinprog.RootLPAlgorithm', 'primal-simplex');
+        mpopt = mpoption(mpopt, 'intlinprog.RootLPAlgorithm', 'dual-simplex');
+        mpopt = mpoption(mpopt, 'intlinprog.TolInteger', 1e-6);
+        %% next line is to work around a bug in intlinprog
+        % (Technical Support Case #01841662)
+        % (except actually in this case it triggers it rather than working
+        %  around it, so we comment it out)
+        %mpopt = mpoption(mpopt, 'intlinprog.LPPreprocess', 'none');
+    else        mpopt = mpoption(mpopt, 'intlinprog.LPPreprocess', 'none');
+        s2 = warning('query', 'optim:intlinprog:IgnoreOptions');
+        warning('off', 'optim:intlinprog:IgnoreOptions');
+    end
 end
 if ~verbose
     mpopt = mpoption(mpopt, 'out.all', 0);
@@ -408,6 +413,8 @@ function t_most_uc(quiet, create_plots, create_pdfs, savedir)
 
 if have_feature('octave')
     warning(s1.state, file_in_path_warn_id);
+elseif have_feature('intlinprog') && have_feature('intlinprog', 'vnum') >= 24 
+    warning(s2.state, 'optim:intlinprog:IgnoreOptions');
 end
 
 t_end;