diff --git a/.gitmodules b/.gitmodules
index f4238e8b..aff647b7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -397,9 +397,6 @@
 [submodule "vendor/grammars/processing.tmbundle"]
 	path = vendor/grammars/processing.tmbundle
 	url = https://github.com/textmate/processing.tmbundle
-[submodule "vendor/grammars/prolog.tmbundle"]
-	path = vendor/grammars/prolog.tmbundle
-	url = https://github.com/textmate/prolog.tmbundle
 [submodule "vendor/grammars/python-django.tmbundle"]
 	path = vendor/grammars/python-django.tmbundle
 	url = https://github.com/textmate/python-django.tmbundle
diff --git a/grammars.yml b/grammars.yml
index 4da6c0e2..33880871 100644
--- a/grammars.yml
+++ b/grammars.yml
@@ -431,8 +431,6 @@ vendor/grammars/powershell:
 - source.powershell
 vendor/grammars/processing.tmbundle:
 - source.processing
-vendor/grammars/prolog.tmbundle:
-- source.prolog
 vendor/grammars/protobuf-tmbundle:
 - source.protobuf
 vendor/grammars/puppet-textmate-bundle:
diff --git a/vendor/grammars/prolog.tmbundle b/vendor/grammars/prolog.tmbundle
deleted file mode 160000
index d955aca3..00000000
--- a/vendor/grammars/prolog.tmbundle
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit d955aca38b7aadce76e6815eb09487a370206742