diff --git a/.github/workflows/matrix-and-codecov.yml b/.github/workflows/matrix-and-codecov.yml
index 91685aa..88318ab 100644
--- a/.github/workflows/matrix-and-codecov.yml
+++ b/.github/workflows/matrix-and-codecov.yml
@@ -17,8 +17,5 @@ jobs:
       project: diffpy.cmistructure
       c_extension: false
       headless: false
-      run: |
-        set -Eeuo pipefail
-        python -m pip install --no-deps diffpy.srfit==3.4.0rc0
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.github/workflows/tests-on-pr.yml b/.github/workflows/tests-on-pr.yml
index e516b3a..6baa308 100644
--- a/.github/workflows/tests-on-pr.yml
+++ b/.github/workflows/tests-on-pr.yml
@@ -11,8 +11,5 @@ jobs:
       project: diffpy.cmistructure
       c_extension: false
       headless: false
-      run: |
-        set -Eeuo pipefail
-        python -m pip install --no-deps diffpy.srfit==3.4.0rc0
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/news/rm-srfit-rc-pin.rst b/news/rm-srfit-rc-pin.rst
new file mode 100644
index 0000000..0685656
--- /dev/null
+++ b/news/rm-srfit-rc-pin.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Require ``diffpy.srfit`` 3.4.0 or later. Older versions lack the methods diffpy.cmistructure calls, so installing it next to ``diffpy.srfit`` 3.3.1 failed at run time.
+
+**Security:**
+
+* <news item>
diff --git a/requirements/conda.txt b/requirements/conda.txt
index 6293140..9493abd 100644
--- a/requirements/conda.txt
+++ b/requirements/conda.txt
@@ -1,5 +1,5 @@
 numpy
 diffpy.srreal
-diffpy.srfit
+diffpy.srfit>=3.4.0
 diffpy.structure
 pyobjcryst
diff --git a/requirements/pip.txt b/requirements/pip.txt
index 6293140..9493abd 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -1,5 +1,5 @@
 numpy
 diffpy.srreal
-diffpy.srfit
+diffpy.srfit>=3.4.0
 diffpy.structure
 pyobjcryst