diff --git a/.gitmodules b/.gitmodules
index 1e43cf9..c834604 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,34 +1,6 @@
-[submodule "ext/libfor"]
-	path = ext/libfor
-	url = https://github.com/cruppstahl/libfor.git
 [submodule "ext/lz4"]
 	path = ext/lz4
 	url = https://github.com/Cyan4973/lz4.git
 [submodule "ext/bitshuffle"]
 	path = ext/bitshuffle
 	url = https://github.com/kiyo-masui/bitshuffle.git
-[submodule "ext/LittleIntPacker"]
-	path = ext/LittleIntPacker
-	url = https://github.com/lemire/LittleIntPacker.git
-[submodule "ext/streamvbyte"]
-	path = ext/streamvbyte
-	url = https://github.com/lemire/streamvbyte.git
-[submodule "ext/libvbyte"]
-	path = ext/libvbyte
-	url = https://github.com/cruppstahl/libvbyte.git
-[submodule "ext/MaskedVByte"]
-	path = ext/MaskedVByte
-	url = https://github.com/lemire/MaskedVByte.git
-[submodule "ext/simdcomp"]
-	path = ext/simdcomp
-	url = https://github.com/lemire/simdcomp.git
-[submodule "ext/FastPFor"]
-	path = ext/FastPFor
-	url = https://github.com/lemire/FastPFor
-[submodule "ext/c-blosc"]
-	path = ext/c-blosc
-	url = https://github.com/Blosc/c-blosc.git
-[submodule "ext/JASSv2"]
-	path = ext/JASSv2
-	url = https://github.com/andrewtrotman/JASSv2
-
diff --git a/ext/FastPFor b/ext/FastPFor
deleted file mode 160000
index 773283d..0000000
--- a/ext/FastPFor
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 773283d4a11fa2440a1b3b28fd77f775e86d7898
diff --git a/ext/JASSv2 b/ext/JASSv2
deleted file mode 160000
index 5ba7f18..0000000
--- a/ext/JASSv2
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5ba7f1884779f0a523539548c34bebe20864acf0
diff --git a/ext/LittleIntPacker b/ext/LittleIntPacker
deleted file mode 160000
index efee2ee..0000000
--- a/ext/LittleIntPacker
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit efee2ee00aa94a5571348da493413fdf65318ef2
diff --git a/ext/MaskedVByte b/ext/MaskedVByte
deleted file mode 160000
index 18f2618..0000000
--- a/ext/MaskedVByte
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 18f2618fd1ad662dff83308ffe58137983c7c82a
diff --git a/ext/c-blosc b/ext/c-blosc
deleted file mode 160000
index a0e5c18..0000000
--- a/ext/c-blosc
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit a0e5c18d37db8e6f1003254a574c8062c5b45e00
diff --git a/ext/libfor b/ext/libfor
deleted file mode 160000
index 4961180..0000000
--- a/ext/libfor
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 49611808d08d4e47116aa2a3ddcabeb418f405f7
diff --git a/ext/libvbyte b/ext/libvbyte
deleted file mode 160000
index 611e011..0000000
--- a/ext/libvbyte
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 611e0115fc61570c0548ce01d6feeea4b52372b6
diff --git a/ext/simdcomp b/ext/simdcomp
deleted file mode 160000
index 631f8a7..0000000
--- a/ext/simdcomp
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 631f8a7a27cb3398be275f0144ab9133d0a2ea4c
diff --git a/ext/streamvbyte b/ext/streamvbyte
deleted file mode 160000
index 0fa291b..0000000
--- a/ext/streamvbyte
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 0fa291b5b829f7c4c52bd42eae65a3e17acc769c