diff --git a/.travis.yml b/.travis.yml
index a27c0bf7..40a03c1b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ dist: trusty
 compiler: gcc
 
 env:
-  - OS_TYPE=centos OS_VERSION=7 DOCKER_IMAGE=lsstdesc/stack-sims:w_2018_48-sims_2_13_0
+  - OS_TYPE=centos OS_VERSION=7 DOCKER_IMAGE=lsstdesc/stack-sims:w_2018_49-sims_2_13_1
 
 services:
   - docker
diff --git a/README.md b/README.md
index e552d9fe..31c95209 100644
--- a/README.md
+++ b/README.md
@@ -34,14 +34,14 @@ execute the `setup imsim` command, and that command can be issued from
 any directory.  The `scons` build step needs only to be re-run if a
 new command line executable is added to the `bin.src` folder.
 
-### obs_lsstCam
+### obs_lsst
 The CCD pixel and LSST focalplane geometries are obtained from the
-lsst/obs_lsstCam package, which is not yet part of the standard LSST
+lsst/obs_lsst package, which is not yet part of the standard LSST
 distribution.  Until it is, you'll need to clone a copy, set it up,
 and build:
 ```
-$ git clone https://github.com/lsst/obs_lsstCam.git
-$ cd obs_lsstCam
+$ git clone https://github.com/lsst/obs_lsst.git
+$ cd obs_lsst
 $ setup -r . -j
 $ scons
 ```
diff --git a/python/desc/imsim/camera_readout.py b/python/desc/imsim/camera_readout.py
index 02740563..b9c1e38e 100644
--- a/python/desc/imsim/camera_readout.py
+++ b/python/desc/imsim/camera_readout.py
@@ -454,7 +454,8 @@ def write_amplifier_image(self, amp_name, outfile, overwrite=True):
         output.writeto(outfile, overwrite=overwrite)
 
     def write_fits_file(self, outfile, overwrite=True, run_number=None,
-                        lsst_num='LCA-11021_RTM-000', compress=True):
+                        lsst_num='LCA-11021_RTM-000', compress=True,
+                        image_type='SKYEXP'):
         """
         Write the processed eimage data as a multi-extension FITS file.
 
@@ -468,6 +469,8 @@ def write_fits_file(self, outfile, overwrite=True, run_number=None,
             Run number.  If None, then the visit number is used.
         compress: bool [True]
             Use RICE_1 compression for each image HDU.
+        image_type str ['SKYEXP']
+            Image type to write to the `OBSTYPE` and `IMGTYPE` keywords.
         """
         output = fits.HDUList(fits.PrimaryHDU())
         output[0].header = self.eimage[0].header
@@ -478,7 +481,7 @@ def write_fits_file(self, outfile, overwrite=True, run_number=None,
         output[0].header['TIMESYS'] = 'TAI'
         output[0].header['LSST_NUM'] = lsst_num
         output[0].header['TESTTYPE'] = 'IMSIM'
-        output[0].header['IMGTYPE'] = 'SKYEXP'
+        output[0].header['IMGTYPE'] = image_type
         output[0].header['OBSTYPE'] = output[0].header['IMGTYPE']
         output[0].header['MONOWL'] = -1
         raft, ccd = output[0].header['CHIPID'].split('_')
diff --git a/python/desc/imsim/imSim.py b/python/desc/imsim/imSim.py
index 1d52f93e..b66f6a19 100644
--- a/python/desc/imsim/imSim.py
+++ b/python/desc/imsim/imSim.py
@@ -841,7 +841,7 @@ def add_cosmic_rays(gs_interpreter, phot_params):
         crs.set_seed(cr_seed)
         gs_interpreter.detectorImages[name] = \
             galsim.Image(crs.paint(imarr, exptime=exptime), wcs=image.wcs)
-        image.wcs.fitsHeader.set('CR_SEED', cr_seed)
+        image.wcs.fitsHeader.set('CR_SEED', str(cr_seed))
 
 
 def add_treering_info(detectors, tr_filename=None):
diff --git a/travis_test.sh b/travis_test.sh
index 8669995a..e1e03c73 100755
--- a/travis_test.sh
+++ b/travis_test.sh
@@ -8,7 +8,11 @@ pip install pylint
 git clone https://github.com/lsst/obs_lsst.git
 cd obs_lsst
 setup -r . -j
-scons
+# Build the obs_lsst package, but avoid the time consuming and lengthy
+# output from the 'tests' target.  The version module is built by the
+# 'tests', so build that explicitly since it is imported by the
+# package itself.
+scons lib python shebang examples doc policy python/lsst/obs/lsst/version.py
 cd ..
 eups declare imsim -r ${TRAVIS_BUILD_DIR} -t current
 setup imsim