diff --git a/.gitignore b/.gitignore
index 8a345b1..92bf94d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /csdiff-*.tar.xz
+/csdiff-*.tar.xz.asc
diff --git a/csdiff-2.3.0.tar.xz.asc b/csdiff-2.3.0.tar.xz.asc
deleted file mode 100644
index 7763219..0000000
--- a/csdiff-2.3.0.tar.xz.asc
+++ /dev/null
@@ -1,16 +0,0 @@
------BEGIN PGP SIGNATURE-----
-
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-=lYjo
------END PGP SIGNATURE-----
diff --git a/csdiff.spec b/csdiff.spec
index 889b2cd..0ce0b44 100644
--- a/csdiff.spec
+++ b/csdiff.spec
@@ -10,12 +10,16 @@
 
 Name:       csdiff
 Version:    2.3.0
-Release:    1%{?dist}
+Release:    2%{?dist}
 Summary:    Non-interactive tools for processing code scan results in plain-text
 
 License:    GPLv3+
 URL:        https://github.com/csutils/csdiff
 Source0:    https://github.com/csutils/csdiff/releases/download/%{name}-%{version}/%{name}-%{version}.tar.xz
+Source1:    https://github.com/csutils/csdiff/releases/download/%{name}-%{version}/%{name}-%{version}.tar.xz.asc
+# gpg --keyserver pgp.mit.edu --recv-key 992A96E075056E79CD8214F9873DB37572A37B36
+# gpg --output kdudka.pgp --armor --export kdudka@redhat.com
+Source2:    kdudka.pgp
 
 # the following upstream commit is needed to work with up2date csdiff/csgrep
 # https://github.com/kdudka/csmock/commit/48b09b3a
@@ -24,6 +28,7 @@ Conflicts:  csmock-plugin-shellcheck <= 2.5
 BuildRequires: boost-devel
 BuildRequires: cmake
 BuildRequires: gcc-c++
+BuildRequires: gnupg2
 BuildRequires: help2man
 BuildRequires: make
 
@@ -65,6 +70,7 @@ code scan defect lists to find out added or fixed defects.
 %endif
 
 %prep
+%{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data='%{SOURCE0}'
 %setup -q
 
 %build
@@ -134,6 +140,9 @@ ctest %{?_smp_mflags} --output-on-failure
 %endif
 
 %changelog
+* Tue Mar 15 2022 Miro Hrončok <mhroncok@redhat.com> - 2.3.0-2
+- Verify GPG signature of upstream tarball when building the package
+
 * Tue Mar 15 2022 Kamil Dudka <kdudka@redhat.com> 2.3.0-1
 - update to latest upstream release
 
diff --git a/kdudka.pgp b/kdudka.pgp
new file mode 100644
index 0000000..ee89e90
--- /dev/null
+++ b/kdudka.pgp
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/sources b/sources
index bf7a9ca..a6c0d26 100644
--- a/sources
+++ b/sources
@@ -1 +1,2 @@
 SHA512 (csdiff-2.3.0.tar.xz) = 6b152c11c42fae12ad52b83856a988c54d975f596edad6cfcd94b48ed9513eb3f8acc56738afc485949cd511d1147c57f9e16010551558791bb0f41c50305c1b
+SHA512 (csdiff-2.3.0.tar.xz.asc) = b6c4c2f20b22b71617c479739a6bae81e1074f7f4ea3192514b1ba14aa4202e0672e2b79a58c856f3696b809d5819232f51c54f54bebf5f4651b5581ee428ddd