diff --git a/.github/workflows/system-info.py b/.github/workflows/system-info.py
index 9e97b897104..3096d3c4f23 100644
--- a/.github/workflows/system-info.py
+++ b/.github/workflows/system-info.py
@@ -4,7 +4,7 @@
 This sort of info is missing from GitHub Actions.
 
 Requested here:
-https://github.com/actions/virtual-environments/issues/79
+https://github.com/actions/runner-images/issues/79
 """
 
 from __future__ import annotations
diff --git a/src/PIL/GbrImagePlugin.py b/src/PIL/GbrImagePlugin.py
index 4992655be81..551e7e8b1f6 100644
--- a/src/PIL/GbrImagePlugin.py
+++ b/src/PIL/GbrImagePlugin.py
@@ -14,7 +14,7 @@
 # See the README file for information on usage and redistribution.
 #
 #
-# See https://github.com/GNOME/gimp/blob/mainline/devel-docs/gbr.txt for
+# See https://developer.gimp.org/core/standards/gbr/ for
 # format documentation.
 #
 # This code Interprets version 1 and 2 .gbr files.
diff --git a/src/PIL/SpiderImagePlugin.py b/src/PIL/SpiderImagePlugin.py
index 3b828b8b86e..f2408583449 100644
--- a/src/PIL/SpiderImagePlugin.py
+++ b/src/PIL/SpiderImagePlugin.py
@@ -27,10 +27,10 @@
 # image data from electron microscopy and tomography.
 #
 # Spider home page:
-# https://spider.wadsworth.org/spider_doc/spider/docs/spider.html
+# https://spider-em.github.io/SPIDER/
 #
 # Details about the Spider image format:
-# https://spider.wadsworth.org/spider_doc/spider/docs/image_doc.html
+# https://spider-em.github.io/SPIDER/docs/image_doc.html
 #
 from __future__ import annotations
 
diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 6b26b4fb0fb..2ed3e2480be 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -130,7 +130,7 @@
 XMP = 700
 JPEGQUALITY = 65537  # pseudo-tag by libtiff
 
-# https://github.com/imagej/ImageJA/blob/master/src/main/java/ij/io/TiffDecoder.java
+# https://github.com/imagej/ImageJ/blob/master/ij/io/TiffDecoder.java
 IMAGEJ_META_DATA_BYTE_COUNTS = 50838
 IMAGEJ_META_DATA = 50839