diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 362b9d8..e35f315 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,6 +47,7 @@ jobs:
         run: perl -V
       - name: install test deps using cpm
         uses: perl-actions/install-with-cpm@v1
+        continue-on-error: true
         with:
           sudo: false
           global: false
diff --git a/lib/Date/Parse.pm b/lib/Date/Parse.pm
index 640f9bd..7985022 100644
--- a/lib/Date/Parse.pm
+++ b/lib/Date/Parse.pm
@@ -122,7 +122,7 @@ sub {
 
   # default C++ boost timestamp is effectively %Y-%b-%d %H:%M:%S.%f
   # details: https://svn.boost.org/trac/boost/ticket/8839
-  if ($dtstr =~ s/\s(\d{4})([-:]?)(\w{3,})\2(\d\d?)(?:[-Tt ](\d\d?)(?:([-:]?)(\d\d?)(?:\6(\d\d?)(?:[.,](\d+))?)?)?)?(?=\D)/ /) {
+  if ($dtstr =~ s/\s(\d{4})([-:]?)($monpat)\2(\d\d?)(?:[-Tt ](\d\d?)(?:([-:]?)(\d\d?)(?:\6(\d\d?)(?:[.,](\d+))?)?)?)?(?=\D)/ /oi) {
     ($year,$month,$day,$hh,$mm,$ss,$frac) = ($1,$month{$3},$4,$5,$7,$8,$9);
   }
 
diff --git a/t/cpanrt-parse.t b/t/cpanrt-parse.t
index 46f6689..561166a 100644
--- a/t/cpanrt-parse.t
+++ b/t/cpanrt-parse.t
@@ -1,6 +1,6 @@
 use strict;
 use warnings;
-use Test::More tests => 26;
+use Test::More tests => 36;
 use Date::Parse qw(strptime str2time);
 
 # RT#48164: Date::Parse unable to set seconds correctly
@@ -122,3 +122,34 @@ use Date::Parse qw(strptime str2time);
     ok(!defined($t),
         "RT#125949: str2time('199001') returns undef for ambiguous 6-digit input");
 }
+
+# Boost format (%Y-%b-%d) should only match valid month names, not arbitrary words.
+# Before the fix, "2024-abc-15" silently parsed using the current month as default.
+{
+    ok(!defined(str2time("2024-abc-15")),
+        "boost format: non-month word 'abc' is rejected");
+    ok(!defined(str2time("2024-foo-01")),
+        "boost format: non-month word 'foo' is rejected");
+
+    # Valid boost-format dates must still parse correctly
+    my $t = str2time("2024-Jan-15 12:00:00 UTC");
+    ok(defined($t), "boost format: '2024-Jan-15' is accepted");
+    my @g = gmtime($t);
+    is($g[3], 15, "boost format: '2024-Jan-15' gives day=15");
+
+    # Case-insensitive month matching
+    my $t_uc = str2time("2024-JAN-15 12:00:00 UTC");
+    ok(defined($t_uc), "boost format: '2024-JAN-15' (uppercase) is accepted");
+    my @g_uc = gmtime($t_uc);
+    is($g_uc[3], 15, "boost format: '2024-JAN-15' gives day=15");
+
+    my $t_lc = str2time("2024-jan-15 12:00:00 UTC");
+    ok(defined($t_lc), "boost format: '2024-jan-15' (lowercase) is accepted");
+    my @g_lc = gmtime($t_lc);
+    is($g_lc[3], 15, "boost format: '2024-jan-15' gives day=15");
+
+    my $t_mc = str2time("2024-JaN-15 12:00:00 UTC");
+    ok(defined($t_mc), "boost format: '2024-JaN-15' (mixed case) is accepted");
+    my @g_mc = gmtime($t_mc);
+    is($g_mc[3], 15, "boost format: '2024-JaN-15' gives day=15");
+}