diff --git a/.gitignore b/.gitignore
index 42d69d3..6f26282 100755
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@
 /postgresql-16.3.tar.bz2
 /postgresql-15.7.tar.bz2.sha256
 /postgresql-16.3.tar.bz2.sha256
+/postgresql-16.6.tar.bz2
+/postgresql-16.6.tar.bz2.sha256
diff --git a/postgresql16.spec b/postgresql16.spec
index 75ae4f9..e018687 100644
--- a/postgresql16.spec
+++ b/postgresql16.spec
@@ -47,8 +47,8 @@
 
 Summary: PostgreSQL client programs
 Name: %{majorname}%{majorversion}
-Version: %{majorversion}.3
-Release: 8%{?dist}
+Version: %{majorversion}.6
+Release: 1%{?dist}
 
 # The PostgreSQL license is very similar to other MIT licenses, but the OSI
 # recognizes it as an independent license, so we do as well.
@@ -573,7 +573,7 @@ cd ..
 # Fiddling with CFLAGS.
 
 CFLAGS="${CFLAGS:-%optflags}"
-CFLAGS="$CFLAGS -DOPENSSL_NO_ENGINE"
+CFLAGS="$CFLAGS -DOPENSSL_NO_ENGINE -std=c18"
 # Strip out -ffast-math from CFLAGS....
 CFLAGS=`echo $CFLAGS|xargs -n 1|grep -v ffast-math|xargs -n 100`
 export CFLAGS
@@ -1331,6 +1331,10 @@ make -C postgresql-setup-%{setup_version} check
 
 
 %changelog
+* Wed Jan 29 2025 Filip Janus <fjanus@redhat.com> - 16.6-1
+- Update to 16.6
+- stick with std=C18
+ 
 * Sat Jan 18 2025 Fedora Release Engineering <releng@fedoraproject.org> - 16.3-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
 
diff --git a/sources b/sources
index 3696058..52b6cbc 100644
--- a/sources
+++ b/sources
@@ -1,5 +1,5 @@
+SHA512 (postgresql-16.6.tar.bz2) = ffd6d39fb7aed87241237d68af4934fba1b4ac1be4d3c2833e308e50c21a693796fe54b73e0905365d7557009c40049a23b966aa86765b969797434a0d4bd5f8
+SHA512 (postgresql-16.6.tar.bz2.sha256) = 2b43dbf07487208f113ebc56958c4e16eb596d39104dc26ffdfded84c196b9fbc12cb52b03775727777fabc297ca26a4c1048b281a3a7b5c20a7bdedc533295f
 SHA512 (postgresql-15.7.tar.bz2) = 8a03e2d7a267f0d11c27d90a2fb605725accb41cfebba2b56c735d4af45bb5f977d4ba051a02ac8d31f93253372df3d3b5efdd159e258d6fcc506b73e3ad6e27
-SHA512 (postgresql-16.3.tar.bz2) = dc1c8d4fbc8e53e9be91dcf1b644b3969bd634f11bf5a1c4fe16619fd386f3349a5509788d43e6a57d099ad75233026d4dd4e0bb180ffc747fd3c1a575c51a5f
-SHA512 (postgresql-setup-8.9.tar.gz) = 118e9ebf858722a38b0e90324bc1b49fc7058cda601ca0a7e78c94e7b95e89d6dbbc46f377626364b068614ced3cde3cb4733973ad2d71bf17892ad773657ef7
 SHA512 (postgresql-15.7.tar.bz2.sha256) = bff16a90703353ad9577d827e3f0616ed8f41ee6ebc86d36ca62c199a2339de482e7f2246a6a3ea843136b9b7e654e4d291e31bfc243ae5a32743c22440dc8f5
-SHA512 (postgresql-16.3.tar.bz2.sha256) = eeebced14bc6c42df864c00397caaafa91b3ddc1c3900943989f04d396674907f63051b93aeb6b1b2408ffeb1b2fc44521b123b42b986b45c19bdcf706523c84
+SHA512 (postgresql-setup-8.9.tar.gz) = 118e9ebf858722a38b0e90324bc1b49fc7058cda601ca0a7e78c94e7b95e89d6dbbc46f377626364b068614ced3cde3cb4733973ad2d71bf17892ad773657ef7