diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.1 (2023-03-15)
+  * fix testing from sdist package (some test data files weren't bundled)
+  * bump fortran-src upper bound to 0.13
+
 ## 0.4.0 (2022-10-19)
   * Update to fortran-src 0.12.0 (bumps minimum compiler version to GHC 9.0)
   * Set upper bounds for various dependencies
diff --git a/fortran-src-extras.cabal b/fortran-src-extras.cabal
--- a/fortran-src-extras.cabal
+++ b/fortran-src-extras.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.35.0.
+-- This file has been generated from package.yaml by hpack version 0.35.2.
 --
 -- see: https://github.com/sol/hpack
 
 name:           fortran-src-extras
-version:        0.4.0
+version:        0.4.1
 synopsis:       Common functions and utils for fortran-src.
 description:    Various utility functions and orphan instances which may be useful when using fortran-src.
 category:       Language
@@ -18,6 +18,10 @@
 extra-source-files:
     README.md
     CHANGELOG.md
+    test/input_data/analysis/relative_include/include.f
+    test/input_data/analysis/relative_include/includee.f
+    test/input_data/analysis/with_include_path/include.f
+    test/input_data/analysis/with_include_path/includes/includee.f
 
 source-repository head
   type: git
@@ -68,7 +72,7 @@
     , containers >=0.5 && <0.7
     , either >=5.0.0 && <5.1
     , filepath >=1.4.1.2 && <1.5
-    , fortran-src >=0.12.0 && <0.13
+    , fortran-src >=0.12.0 && <0.14
     , optparse-applicative >=0.14 && <0.18
     , text >=1.2 && <2.1
     , uniplate >=1.6.10 && <1.7
@@ -108,7 +112,7 @@
     , base >=4.7 && <5
     , bytestring >=0.10 && <0.12
     , containers >=0.5 && <0.7
-    , fortran-src >=0.12.0 && <0.13
+    , fortran-src >=0.12.0 && <0.14
     , fortran-src-extras
     , optparse-applicative >=0.14 && <0.18
     , text >=1.2 && <2.1
@@ -153,7 +157,7 @@
     , base >=4.7 && <5
     , bytestring >=0.10 && <0.12
     , containers >=0.5 && <0.7
-    , fortran-src >=0.12.0 && <0.13
+    , fortran-src >=0.12.0 && <0.14
     , fortran-src-extras
     , hspec >=2.2 && <3
     , optparse-applicative >=0.14 && <0.18
diff --git a/src/Language/Fortran/Extras.hs b/src/Language/Fortran/Extras.hs
--- a/src/Language/Fortran/Extras.hs
+++ b/src/Language/Fortran/Extras.hs
@@ -226,7 +226,7 @@
 withToolOptionsAndProgramOrBlock programDescription programHeader optsParser handler = do
   RunOptions srcOptions toolOptions <-
     getRunOptions programDescription programHeader optsParser
-  ast <- if takeExtension (path srcOptions) == ".inc"
+  ast <- if takeExtension (path srcOptions) `elem` [".inc", ".ins"]
     then Left . (path srcOptions, ) <$> incFile srcOptions
     else Right <$> programFile srcOptions
   handler toolOptions ast
diff --git a/test/input_data/analysis/relative_include/include.f b/test/input_data/analysis/relative_include/include.f
new file mode 100644
--- /dev/null
+++ b/test/input_data/analysis/relative_include/include.f
@@ -0,0 +1,5 @@
+      program main
+
+      include "includee.f"
+
+      end
diff --git a/test/input_data/analysis/relative_include/includee.f b/test/input_data/analysis/relative_include/includee.f
new file mode 100644
--- /dev/null
+++ b/test/input_data/analysis/relative_include/includee.f
@@ -0,0 +1,1 @@
+      character*(*) var_from_includee
diff --git a/test/input_data/analysis/with_include_path/include.f b/test/input_data/analysis/with_include_path/include.f
new file mode 100644
--- /dev/null
+++ b/test/input_data/analysis/with_include_path/include.f
@@ -0,0 +1,5 @@
+      program main
+
+      include "includee.f"
+
+      end
diff --git a/test/input_data/analysis/with_include_path/includes/includee.f b/test/input_data/analysis/with_include_path/includes/includee.f
new file mode 100644
--- /dev/null
+++ b/test/input_data/analysis/with_include_path/includes/includee.f
@@ -0,0 +1,1 @@
+      character*(*) var_from_includee