diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf4b8da5cc..3efb67ac3e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -939,7 +939,7 @@ if(CURL_USE_GNUTLS)
   if(NOT DEFINED HAVE_GNUTLS_SRP AND NOT CURL_DISABLE_SRP)
     cmake_push_check_state()
     list(APPEND CMAKE_REQUIRED_LIBRARIES CURL::gnutls)
-    # In GnuTLS 3.8.0 (2023-02-10) and upper, this check always succeeds.
+    # In GnuTLS 3.8.0 (2023-02-10) or higher, this check always succeeds.
     # Detecting actual TLS-SRP support needs poking the API at runtime.
     check_symbol_exists("gnutls_srp_verifier" "gnutls/gnutls.h" HAVE_GNUTLS_SRP)
     cmake_pop_check_state()
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 56fdc4775d..052e1979b7 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -182,7 +182,7 @@
 
 #ifdef HAVE_LIBZ
 #  ifndef ZLIB_CONST
-#  define ZLIB_CONST  /* Use z_const. Supported by v1.2.5.2 and upper. */
+#  define ZLIB_CONST  /* Use z_const. Supported by v1.2.5.2 or higher. */
 #  endif
 #endif
 
diff --git a/m4/curl-gnutls.m4 b/m4/curl-gnutls.m4
index 3eab1c5d31..a67ca41382 100644
--- a/m4/curl-gnutls.m4
+++ b/m4/curl-gnutls.m4
@@ -203,7 +203,7 @@ if test "$GNUTLS_ENABLED" = "1"; then
   dnl ---
   dnl We require GnuTLS with SRP support.
   dnl
-  dnl In GnuTLS 3.8.0 (2023-02-10) and upper, this check always succeeds.
+  dnl In GnuTLS 3.8.0 (2023-02-10) or higher, this check always succeeds.
   dnl Detecting actual TLS-SRP support needs poking the API at runtime.
   dnl ---
   AC_CHECK_LIB(gnutls, gnutls_srp_verifier,