diff --git a/packages/4ti2interface/meta.json b/packages/4ti2interface/meta.json
index 7cfe6de11..c445812ce 100644
--- a/packages/4ti2interface/meta.json
+++ b/packages/4ti2interface/meta.json
@@ -1,10 +1,11 @@
 {
   "AbstractHTML": "The <span class=\"pkgname\">4ti2Interface</span> package provides an interface to 4ti2",
   "ArchiveFormats": ".tar.gz .zip",
-  "ArchiveSHA256": "14004024e413453150cd32e07e1529caeb36d4384890e2a5bfc15e53e778192d",
-  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/4ti2Interface-2025.12-01/4ti2Interface-2025.12-01",
+  "ArchiveSHA256": "383391836acda8da95743f781686178ebd07cd15b3f13af4dbba1a5825ecf4a7",
+  "ArchiveSize": 140376,
+  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/4ti2Interface-2026.05-01/4ti2Interface-2026.05-01",
   "AvailabilityTest": null,
-  "Date": "2025-12-23",
+  "Date": "2026-05-27",
   "Dependencies": {
     "ExternalConditions": [
       [
@@ -18,7 +19,14 @@
         "io",
         ">=4.2"
       ]
-    ]
+    ],
+    "NeededSystemPackages": {
+      "Ubuntu": [
+        [
+          "4ti2"
+        ]
+      ]
+    }
   },
   "IssueTrackerURL": "https://github.com/homalg-project/homalg_project/issues",
   "Keywords": [],
@@ -35,7 +43,7 @@
       "SixFile": "doc/manual.six"
     }
   ],
-  "PackageInfoSHA256": "f97ac8dfe85bb7d21c1d538680d0b57275f82eec0022a7e387e29809238e27a0",
+  "PackageInfoSHA256": "5d2ecf3f4de73417eeab4f16f85e577cadd796751fb5ae60f51dbf58a2ef242a",
   "PackageInfoURL": "https://homalg-project.github.io/homalg_project/4ti2Interface/PackageInfo.g",
   "PackageName": "4ti2Interface",
   "PackageWWWHome": "https://homalg-project.github.io/pkg/4ti2Interface",
@@ -60,5 +68,5 @@
   "Status": "deposited",
   "Subtitle": "A link to 4ti2",
   "TestFile": "tst/testall.g",
-  "Version": "2025.12-01"
+  "Version": "2026.05-01"
 }
diff --git a/packages/localizeringforhomalg/meta.json b/packages/localizeringforhomalg/meta.json
index 0dc3e4c87..9826c7a84 100644
--- a/packages/localizeringforhomalg/meta.json
+++ b/packages/localizeringforhomalg/meta.json
@@ -1,15 +1,16 @@
 {
   "AbstractHTML": "This package is part of the homalg-project and allows localization of a (computable) commutative ring at a (finitely generated) maximal ideal.",
   "ArchiveFormats": ".tar.gz .zip",
-  "ArchiveSHA256": "262ce8365a15db0c6897a93b8c7d3ec8ae7b1ab8dbede4213e566b66c46246b1",
-  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/LocalizeRingForHomalg-2026.04-01/LocalizeRingForHomalg-2026.04-01",
+  "ArchiveSHA256": "4ef26b4f6c7d600b2cb0b8de950dd7496f1612e542b147fa9599509915765b38",
+  "ArchiveSize": 303730,
+  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/LocalizeRingForHomalg-2026.05-01/LocalizeRingForHomalg-2026.05-01",
   "AutoDoc": {
     "TitlePage": {
       "Copyright": "&copyright; 2009-2015 by Mohamed Barakat and Markus Lange-Hegermann\n\nThis package may be distributed under the terms and conditions of the GNU Public License Version 2 or (at your option) any later version.\n"
     }
   },
   "AvailabilityTest": null,
-  "Date": "2026-04-10",
+  "Date": "2026-05-27",
   "Dependencies": {
     "ExternalConditions": [],
     "GAP": ">= 4.13.0",
@@ -25,12 +26,20 @@
       [
         "Modules",
         ">= 2026.04-01"
-      ],
-      [
-        "GAPDoc",
-        ">= 1.0"
       ]
     ],
+    "NeededSystemPackages": {
+      "Homebrew": [
+        [
+          "singular"
+        ]
+      ],
+      "Ubuntu": [
+        [
+          "singular"
+        ]
+      ]
+    },
     "SuggestedOtherPackages": []
   },
   "IssueTrackerURL": "https://github.com/homalg-project/homalg_project/issues",
@@ -54,7 +63,7 @@
       "SixFile": "doc/manual.six"
     }
   ],
-  "PackageInfoSHA256": "081899785fa382ccbe3fcfa3846c4681ae8c603c400e20d067f038afa0581748",
+  "PackageInfoSHA256": "1780c2b661d5d1de35905a5ddde4a87ba6ebc2caf03d8ad9ba87b535b90db565",
   "PackageInfoURL": "https://homalg-project.github.io/homalg_project/LocalizeRingForHomalg/PackageInfo.g",
   "PackageName": "LocalizeRingForHomalg",
   "PackageWWWHome": "https://homalg-project.github.io/pkg/LocalizeRingForHomalg",
@@ -101,5 +110,5 @@
   "Status": "deposited",
   "Subtitle": "A Package for Localization of Polynomial Rings",
   "TestFile": "tst/testall.g",
-  "Version": "2026.04-01"
+  "Version": "2026.05-01"
 }
diff --git a/packages/ringsforhomalg/meta.json b/packages/ringsforhomalg/meta.json
index 11703473b..790cc30c4 100644
--- a/packages/ringsforhomalg/meta.json
+++ b/packages/ringsforhomalg/meta.json
@@ -1,15 +1,16 @@
 {
   "AbstractHTML": "The <span class=\"pkgname\">RingsForHomalg</span> package provides small dictionaries for  <span class=\"pkgname\">homalg</span> to speak (as much as needed of) the languages  of Singular, Macaulay2, MAGMA, Sage, and Maple",
   "ArchiveFormats": ".tar.gz .zip",
-  "ArchiveSHA256": "acb28c65f49d6d9e1487fc00ef88b091c23f050e1c8f004d27e2542cdfeefebf",
-  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/RingsForHomalg-2025.12-01/RingsForHomalg-2025.12-01",
+  "ArchiveSHA256": "346c2be6cf58827b91f097a6a0f3dc148f4ea9c5b015a9f9ebd2812e39a6a404",
+  "ArchiveSize": 1141591,
+  "ArchiveURL": "https://github.com/homalg-project/homalg_project/releases/download/RingsForHomalg-2026.05-01/RingsForHomalg-2026.05-01",
   "AutoDoc": {
     "TitlePage": {
       "Copyright": "&copyright; 2007-2015 by Mohamed Barakat, Simon Görtzen, Markus Kirschmer, Markus Lange-Hegermann, Oleksandr Motsak, Max Neunhöffer, Daniel Robertz, and Hans Schönemann.\n\nThis package may be distributed under the terms and conditions of the GNU Public License Version 2 or (at your option) any later version.\n"
     }
   },
   "AvailabilityTest": null,
-  "Date": "2025-12-23",
+  "Date": "2026-05-27",
   "Dependencies": {
     "ExternalConditions": [],
     "GAP": ">= 4.13.0",
@@ -25,12 +26,20 @@
       [
         "GaussForHomalg",
         ">= 2023.08-01"
-      ],
-      [
-        "GAPDoc",
-        ">= 1.0"
       ]
     ],
+    "NeededSystemPackages": {
+      "Homebrew": [
+        [
+          "singular"
+        ]
+      ],
+      "Ubuntu": [
+        [
+          "singular"
+        ]
+      ]
+    },
     "SuggestedOtherPackages": []
   },
   "IssueTrackerURL": "https://github.com/homalg-project/homalg_project/issues",
@@ -53,7 +62,7 @@
       "SixFile": "doc/manual.six"
     }
   ],
-  "PackageInfoSHA256": "eeef9790daaf761a4438a55db1798f878f3511329c90fbc51f470ff907088958",
+  "PackageInfoSHA256": "ed6ed512701ac19a3faa6403ef1ffbcd9193bdfce431e02d9a8395961425f933",
   "PackageInfoURL": "https://homalg-project.github.io/homalg_project/RingsForHomalg/PackageInfo.g",
   "PackageName": "RingsForHomalg",
   "PackageWWWHome": "https://homalg-project.github.io/pkg/RingsForHomalg",
@@ -176,5 +185,5 @@
   "Status": "deposited",
   "Subtitle": "Dictionaries of external rings",
   "TestFile": "tst/testall.g",
-  "Version": "2025.12-01"
+  "Version": "2026.05-01"
 }