diff --git a/libdap-3.21.0.120.tar.gz b/libdap-3.21.0.120.tar.gz
deleted file mode 100644
index 0a7b41c1dff2946d0f0add6b473e85c21ea63617..0000000000000000000000000000000000000000
Binary files a/libdap-3.21.0.120.tar.gz and /dev/null differ
diff --git a/libdap.spec b/libdap.spec
index 0a3888b849af7cdbfea1a3ec4bbf4ad4e322aa4c..5b4164e476b861b87b2aa5dbf3bc08ecfb88d199 100644
--- a/libdap.spec
+++ b/libdap.spec
@@ -1,11 +1,11 @@
 %global libdap_tag 3.21.0-120
 Name:          libdap
-Version:       3.21.0.120
+Version:       3.21.1
 Release:       1
 Summary:       The C++ DAP2 and DAP4 library from OPeNDAP.
 License:       LGPLv2+
 URL:           http://www.opendap.org/
-Source0:       https://github.com/OPENDAP/libdap4/archive/%{libdap_tag}/%{name}-%{version}.tar.gz
+Source0:       https://github.com/OPENDAP/libdap4/archive/ref/tags/%{name}4-%{version}.tar.gz
 
 # Remark HTTP tests - builders don't have network connections
 Patch0:        0001-libdap-offline.patch
@@ -50,7 +50,7 @@ Obsoletes:     %{name}-doc < %{version}-%{release}
 Man pages and other help documents for %{name}.
 
 %prep
-%autosetup -n libdap4-%{libdap_tag} -p1
+%autosetup -n libdap4-%{version} -p1
 
 %build
 autoreconf -f -i
@@ -95,6 +95,9 @@ make check || :
 %{_mandir}/man1/*
 
 %changelog
+* Sat Oct 11 2025 dillon chen <dillon.chen@gmail.com> - 3.21.1-1
+- Update package to version 3.21.1
+
 * Tue Mar 25 2025 Dongxing Wang <dongxing.wang_a@thundersoft.com> - 3.21.0.120-1
 - Update package to version 3.21.0.120
 
diff --git a/libdap4-3.21.1.tar.gz b/libdap4-3.21.1.tar.gz
new file mode 100644
index 0000000000000000000000000000000000000000..c340f25a08a89bc848cb1b3786da0a6b2fcf7f1c
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