diff --git a/salt/salt/cmark-gfm.sls b/salt/salt/cmark-gfm.sls
index 763f2d1..df7a794 100644
--- a/salt/salt/cmark-gfm.sls
+++ b/salt/salt/cmark-gfm.sls
@@ -3,8 +3,8 @@ unpack-cmark-gfm:
     - name: /tmp/cmark-gfm
     - source:
       - salt://cmark-gfm.tar.gz
-      - https://github.com/github/cmark/archive/0.28.0.gfm.11.tar.gz
-    - source_hash: sha256=8100698cd6fa4e3d870d9c7fbf92ef795a60ea3d7b00e3a4d1904105b1191fae
+      - https://github.com/github/cmark-gfm/archive/0.28.3.gfm.17.tar.gz
+    - source_hash: sha256=101ccfcd4f0fd8b05c20994006d992f2e81d6f96655afee4c66742ccc21f1f7d
     - if_missing: /usr/local/lib/libcmark-gfm.so
     - options: --strip-components=1
     - enforce_toplevel: False
diff --git a/tildes/tildes/lib/cmark.py b/tildes/tildes/lib/cmark.py
index 4c6ab5a..6180068 100644
--- a/tildes/tildes/lib/cmark.py
+++ b/tildes/tildes/lib/cmark.py
@@ -5,7 +5,7 @@ from ctypes import CDLL, c_char_p, c_int, c_size_t, c_void_p
 
 
 CMARK_DLL = CDLL("/usr/local/lib/libcmark-gfm.so")
-CMARK_EXT_DLL = CDLL("/usr/local/lib/libcmark-gfmextensions.so")
+CMARK_EXT_DLL = CDLL("/usr/local/lib/libcmark-gfm-extensions.so")
 
 # enables the --hardbreaks option for cmark
 # (can I import this? it's defined in cmark.h as CMARK_OPT_HARDBREAKS)
@@ -49,7 +49,7 @@ cmark_render_html = CMARK_DLL.cmark_render_html
 cmark_render_html.restype = c_char_p
 cmark_render_html.argtypes = (c_void_p, c_int, c_void_p)
 
-register = CMARK_EXT_DLL.core_extensions_ensure_registered
+register = CMARK_EXT_DLL.cmark_gfm_core_extensions_ensure_registered
 register.restype = None
 register.argtypes = ()
 register()