diff --git a/pretext/__init__.py b/pretext/__init__.py
index 1dbb48d8..9342856b 100644
--- a/pretext/__init__.py
+++ b/pretext/__init__.py
@@ -19,7 +19,7 @@
 VERSION = get_version("pretext", Path(__file__).parent.parent)
 
 
-CORE_COMMIT = "ce20f15d525f2d1e7a3c3fb8da3bb5fa9d16d3ee"
+CORE_COMMIT = "e98e2f879c6da2daaf3435bdcff832c3fc05c91b"
 
 
 def activate() -> None:
diff --git a/pretext/constants.py b/pretext/constants.py
index 6a58c22b..461b12e7 100644
--- a/pretext/constants.py
+++ b/pretext/constants.py
@@ -8,6 +8,7 @@
     "pdf",
     "latex",
     "epub",
+    "epub_nozip",
     "kindle",
     "braille",
     "revealjs",
@@ -70,6 +71,20 @@
         "myopenmath",
         "dynamic-subs",
     ],
+    "epub_nozip": [
+        "webwork",
+        "latex-image",
+        "sageplot",
+        "asymptote",
+        "youtube",
+        "codelens",
+        "datafile",
+        "interactive",
+        "qrcode",
+        "mermaid",
+        "myopenmath",
+        "dynamic-subs",
+    ],
     "kindle": [
         "webwork",
         "latex-image",
@@ -198,6 +213,13 @@
         "prefigure": ["svg"],
         "mermaid": ["svg"],
     },
+    "epub_nozip": {
+        "asymptote": ["svg"],
+        "latex-image": ["svg"],
+        "sageplot": ["svg"],
+        "prefigure": ["svg"],
+        "mermaid": ["svg"],
+    },
     "kindle": {
         "asymptote": ["png"],
         "latex-image": ["png"],
diff --git a/pretext/project/__init__.py b/pretext/project/__init__.py
index 9c298622..d9bad097 100644
--- a/pretext/project/__init__.py
+++ b/pretext/project/__init__.py
@@ -53,6 +53,7 @@ class Format(str, Enum):
     LATEX = "latex"
     PDF = "pdf"
     EPUB = "epub"
+    EPUB_NOZIP = "epub_nozip"
     KINDLE = "kindle"
     BRAILLE = "braille"
     REVEALJS = "revealjs"
@@ -810,6 +811,18 @@ def build(
                     pub_file=self.publication_abspath().as_posix(),
                     out_file=out_file,
                     dest_dir=self.output_dir_abspath().as_posix(),
+                    file_format="epub",
+                    math_format="svg",
+                    stringparams=stringparams_copy,
+                )
+            elif self.format == Format.EPUB_NOZIP:
+                utils.mjsre_npm_install()
+                core.epub(
+                    xml_source=self.source_abspath(),
+                    pub_file=self.publication_abspath().as_posix(),
+                    out_file=out_file,
+                    dest_dir=self.output_dir_abspath().as_posix(),
+                    file_format="nozip",
                     math_format="svg",
                     stringparams=stringparams_copy,
                 )
@@ -820,6 +833,7 @@ def build(
                     pub_file=self.publication_abspath().as_posix(),
                     out_file=out_file,
                     dest_dir=self.output_dir_abspath().as_posix(),
+                    file_format="epub",
                     math_format="kindle",
                     stringparams=stringparams_copy,
                 )