diff --git a/CHANGES.txt b/CHANGES.txt
index 430044bc..08e3ff4f 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -3,6 +3,13 @@ Changes
 
 All issue numbers are relative to https://github.com/Toblerity/Fiona/issues.
 
+1.10.0rc1 (TBD)
+---------------
+
+Bug fixes:
+
+- The truncate VSI plugin callback has been implemented (#1413).
+
 1.10b2 (2024-07-10)
 -------------------
 
diff --git a/Makefile b/Makefile
index 8a7e7bcf..3e17db9f 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ dockertestimage:
 	docker build --target gdal --build-arg GDAL=$(GDAL) --build-arg PYTHON_VERSION=$(PYTHON_VERSION) -t fiona:$(GDAL)-py$(PYTHON_VERSION) .
 
 dockertest: dockertestimage
-	docker run -it -v $(shell pwd):/app -v /tmp:/tmp --env AWS_ACCESS_KEY_ID --env AWS_SECRET_ACCESS_KEY --entrypoint=/bin/bash fiona:$(GDAL)-py$(PYTHON_VERSION) -c '/venv/bin/python -m pip install tiledb && /venv/bin/python -m pip install -vvv --editable .[all] --no-build-isolation && /venv/bin/python -B -m pytest -m "not wheel" --cov fiona --cov-report term-missing $(OPTS)'
+	docker run -it -v $(shell pwd):/app -v /tmp:/tmp --env AWS_ACCESS_KEY_ID --env AWS_SECRET_ACCESS_KEY --entrypoint=/bin/bash fiona:$(GDAL)-py$(PYTHON_VERSION) -c '/venv/bin/python -m pip install -vvv --editable .[all] --no-build-isolation && /venv/bin/python -B -m pytest -m "not wheel" --cov fiona --cov-report term-missing $(OPTS)'
 
 dockershell: dockertestimage
 	docker run -it -v $(shell pwd):/app --env AWS_ACCESS_KEY_ID --env AWS_SECRET_ACCESS_KEY --entrypoint=/bin/bash fiona:$(GDAL)-py$(PYTHON_VERSION) -c '/venv/bin/python -m pip install --editable . --no-build-isolation && /bin/bash'
diff --git a/fiona/_vsiopener.pyx b/fiona/_vsiopener.pyx
index 0babadfe..9eb80aed 100644
--- a/fiona/_vsiopener.pyx
+++ b/fiona/_vsiopener.pyx
@@ -288,7 +288,8 @@ cdef size_t pyopener_write(void *pFile, void *pBuffer, size_t nSize, size_t nCou
         "Writing data: file_obj=%r, buff_view=%r, buffer_len=%r",
         file_obj,
         buff_view,
-        buffer_len)
+        buffer_len
+    )
     try:
         num = file_obj.write(buff_view)
     except TypeError:
@@ -306,6 +307,16 @@ cdef int pyopener_flush(void *pFile) with gil:
         return 1
 
 
+cdef int pyopener_truncate(void *pFile, vsi_l_offset size) with gil:
+    cdef object file_obj = <object>pFile
+    log.debug("Truncating: file_obj=%r, size=%r", file_obj, size)
+    try:
+        file_obj.truncate(size)
+        return 0
+    except AttributeError:
+        return 1
+
+
 cdef int pyopener_close(void *pFile) with gil:
     cdef object file_obj = <object>pFile
     log.debug("Closing: file_obj=%r", file_obj)
@@ -373,6 +384,7 @@ def _opener_registration(urlpath, obj):
             callbacks_struct.read = <VSIFilesystemPluginReadCallback>pyopener_read
             callbacks_struct.write = <VSIFilesystemPluginWriteCallback>pyopener_write
             callbacks_struct.flush = <VSIFilesystemPluginFlushCallback>pyopener_flush
+            callbacks_struct.truncate = <VSIFilesystemPluginTruncateCallback>pyopener_truncate
             callbacks_struct.close = <VSIFilesystemPluginCloseCallback>pyopener_close
             callbacks_struct.read_dir = <VSIFilesystemPluginReadDirCallback>pyopener_read_dir
             callbacks_struct.stat = <VSIFilesystemPluginStatCallback>pyopener_stat