diff --git a/abi_symbols b/abi_symbols
--- a/abi_symbols
+++ b/abi_symbols
@@ -46,31 +46,12 @@
 libcfitsio.so.9:Fitsio_Pthread_Status
 libcfitsio.so.9:FptrTable
 libcfitsio.so.9:STREAM_DRIVER
-libcfitsio.so.9:adler32
-libcfitsio.so.9:adler32_combine
-libcfitsio.so.9:adler32_combine64
 libcfitsio.so.9:angsep_calc
 libcfitsio.so.9:block_mode
 libcfitsio.so.9:bz_internal_error
 libcfitsio.so.9:comma2semicolon
 libcfitsio.so.9:compress2file_from_mem
 libcfitsio.so.9:compress2mem_from_mem
-libcfitsio.so.9:crc32
-libcfitsio.so.9:crc32_combine
-libcfitsio.so.9:crc32_combine64
-libcfitsio.so.9:deflate
-libcfitsio.so.9:deflateBound
-libcfitsio.so.9:deflateCopy
-libcfitsio.so.9:deflateEnd
-libcfitsio.so.9:deflateInit2_
-libcfitsio.so.9:deflateInit_
-libcfitsio.so.9:deflateParams
-libcfitsio.so.9:deflatePrime
-libcfitsio.so.9:deflateReset
-libcfitsio.so.9:deflateSetDictionary
-libcfitsio.so.9:deflateSetHeader
-libcfitsio.so.9:deflateTune
-libcfitsio.so.9:deflate_copyright
 libcfitsio.so.9:driverTable
 libcfitsio.so.9:ffGetVariable
 libcfitsio.so.9:ff_create_buffer
@@ -1608,7 +1589,6 @@
 libcfitsio.so.9:gFitsFiles
 libcfitsio.so.9:gMinStrLen
 libcfitsio.so.9:gParse
-libcfitsio.so.9:get_crc_table
 libcfitsio.so.9:http_checkfile
 libcfitsio.so.9:http_compress_open
 libcfitsio.so.9:http_file_open
@@ -1649,24 +1629,6 @@
 libcfitsio.so.9:imcomp_scalevaluesi2
 libcfitsio.so.9:imcomp_test_overlap
 libcfitsio.so.9:imcomp_write_nocompress_tile
-libcfitsio.so.9:inflate
-libcfitsio.so.9:inflateBack
-libcfitsio.so.9:inflateBackEnd
-libcfitsio.so.9:inflateBackInit_
-libcfitsio.so.9:inflateCopy
-libcfitsio.so.9:inflateEnd
-libcfitsio.so.9:inflateGetHeader
-libcfitsio.so.9:inflateInit2_
-libcfitsio.so.9:inflateInit_
-libcfitsio.so.9:inflateMark
-libcfitsio.so.9:inflatePrime
-libcfitsio.so.9:inflateReset
-libcfitsio.so.9:inflateReset2
-libcfitsio.so.9:inflateSetDictionary
-libcfitsio.so.9:inflateSync
-libcfitsio.so.9:inflateSyncPoint
-libcfitsio.so.9:inflateUndermine
-libcfitsio.so.9:inflate_copyright
 libcfitsio.so.9:iraf2mem
 libcfitsio.so.9:lcxxx
 libcfitsio.so.9:master_grp_idx
@@ -1801,7 +1763,6 @@
 libcfitsio.so.9:stream_seek
 libcfitsio.so.9:stream_size
 libcfitsio.so.9:stream_write
-libcfitsio.so.9:uncompress
 libcfitsio.so.9:uncompress2file
 libcfitsio.so.9:uncompress2mem
 libcfitsio.so.9:uncompress2mem_from_mem
@@ -1809,8 +1770,4 @@
 libcfitsio.so.9:urltype2driver
 libcfitsio.so.9:work
 libcfitsio.so.9:yyfffree
-libcfitsio.so.9:zError
-libcfitsio.so.9:z_errmsg
-libcfitsio.so.9:zlibCompileFlags
-libcfitsio.so.9:zlibVersion
 libcfitsio.so.9:zuncompress2mem
diff --git a/abi_used_libs b/abi_used_libs
--- a/abi_used_libs
+++ b/abi_used_libs
@@ -2,3 +2,4 @@
 libcurl.so.4
 libm.so.6
 libpthread.so.0
+libz.so.1
diff --git a/abi_used_symbols b/abi_used_symbols
--- a/abi_used_symbols
+++ b/abi_used_symbols
@@ -33,6 +33,7 @@
 libc.so.6:fmemopen
 libc.so.6:fopen64
 libc.so.6:fputc
+libc.so.6:fputs
 libc.so.6:fread
 libc.so.6:free
 libc.so.6:fseek
@@ -132,3 +133,9 @@
 libpthread.so.0:pthread_mutexattr_settype
 libpthread.so.0:recv
 libpthread.so.0:send
+libz.so.1:deflate
+libz.so.1:deflateEnd
+libz.so.1:deflateInit2_
+libz.so.1:inflate
+libz.so.1:inflateEnd
+libz.so.1:inflateInit2_
diff --git a/package.yml b/package.yml
--- a/package.yml
+++ b/package.yml
@@ -1,8 +1,9 @@
 name       : cfitsio
-version    : '3.48'
-release    : 3
+version    : 4.0.0
+release    : 4
 source     :
-    - http://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio-3.48.tar.gz : 91b48ffef544eb8ea3908543052331072c99bf09ceb139cb3c6977fc3e47aac1
+    - https://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio-4.0.0.tar.gz : b2a8efba0b9f86d3e1bd619f662a476ec18112b4f27cc441cc680a4e3777425e
+homepage   : https://heasarc.gsfc.nasa.gov/fitsio/
 license    : MIT
 component  : programming.library
 summary    : CFITSIO is a library of ANSI C routines for reading and writing FITS format data files.
diff --git a/pspec_x86_64.xml b/pspec_x86_64.xml
--- a/pspec_x86_64.xml
+++ b/pspec_x86_64.xml
@@ -1,9 +1,10 @@
 <PISI>
     <Source>
         <Name>cfitsio</Name>
+        <Homepage>https://heasarc.gsfc.nasa.gov/fitsio/</Homepage>
         <Packager>
-            <Name>Joshua Strobl</Name>
-            <Email>joshua@streambits.io</Email>
+            <Name>Martin Reboredo</Name>
+            <Email>yakoyoku@gmail.com</Email>
         </Packager>
         <License>MIT</License>
         <PartOf>programming.library</PartOf>
@@ -20,7 +21,7 @@
         <PartOf>programming.library</PartOf>
         <Files>
             <Path fileType="library">/usr/lib64/libcfitsio.so.9</Path>
-            <Path fileType="library">/usr/lib64/libcfitsio.so.9.3.48</Path>
+            <Path fileType="library">/usr/lib64/libcfitsio.so.9.4.0.0</Path>
         </Files>
     </Package>
     <Package>
@@ -30,7 +31,7 @@
 </Description>
         <PartOf>programming.devel</PartOf>
         <RuntimeDependencies>
-            <Dependency release="3">cfitsio</Dependency>
+            <Dependency release="4">cfitsio</Dependency>
         </RuntimeDependencies>
         <Files>
             <Path fileType="header">/usr/include/drvrsmem.h</Path>
@@ -42,12 +43,12 @@
         </Files>
     </Package>
     <History>
-        <Update release="3">
-            <Date>2020-06-17</Date>
-            <Version>3.48</Version>
+        <Update release="4">
+            <Date>2021-11-14</Date>
+            <Version>4.0.0</Version>
             <Comment>Packaging update</Comment>
-            <Name>Joshua Strobl</Name>
-            <Email>joshua@streambits.io</Email>
+            <Name>Martin Reboredo</Name>
+            <Email>yakoyoku@gmail.com</Email>
         </Update>
     </History>
 </PISI>
\ No newline at end of file